diff --git a/.gitignore b/.gitignore
index ca35be0..4340d61 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,7 @@
 _site
+.idea/misc.xml
+.idea/encodings.xml
+.idea/modules.xml
+.idea/Gizmo.iml
+.idea/workspace.xml
+.idea/vcs.xml
diff --git a/Week1/Python/Python_week1.md b/Chapter_1_Python/Python_warmup.md
similarity index 97%
rename from Week1/Python/Python_week1.md
rename to Chapter_1_Python/Python_warmup.md
index bccb830..6086c24 100644
--- a/Week1/Python/Python_week1.md
+++ b/Chapter_1_Python/Python_warmup.md
@@ -1,7 +1,6 @@
 # Introduction to Python
 
-
-#### About Python Language  
+#### About Python Language  
 
 Remember that you are intelligent, and you can learn, but the computer is simple and very fast, but can not learn by itself. Therefore, for you to communicate instructions on the computer, it is easier for you to learn a computer Language (e.g. Python) than for the computer to learn English.
 
@@ -200,7 +199,7 @@ print x
 When a program is running, it flows from one step to the next.  As programmers, we set up “paths” for the program to follow.
 
 <p align="center">
-<img src="Flow_1.png" alt="Drawing" width="300">
+<img src="../img/Flow_1.png" alt="Drawing" width="300">
 </p>
 
 Close the text editor, and then you can execute it in two ways:
@@ -219,7 +218,7 @@ $ ./example_fllow.py
 Now let's do an example where we have a __conditional__ that implies a decision-making about a situation. Decision making is the anticipation of conditions occurring while execution of the program and specifying actions taken according to the conditions. The following diagram illustrates the conditional:
 
 <p align="center">
-<img src="decision_making.jpg" alt="Conditional" width="300">
+<img src="../img/decision_making.jpg" alt="Conditional" width="300">
 </p>
 
 ``` bash
@@ -245,13 +244,13 @@ $ ./example_conditional.py
 Flow of the code:
 
 <p align="center">
-<img src="Flow_Conditional.png" alt="Conditional" width="300">
+<img src="../img/Flow_Conditional.png" alt="Conditional" width="300">
 </p>
 
 A __loop statement__ allows us to execute a statement or group of statements multiple times. The following diagram illustrates a loop statement:
 
 <p align="center">
-<img src="loop_architecture.jpg" alt="Conditional" width="300">
+<img src="../img/loop_architecture.jpg" alt="Conditional" width="300">
 </p>
 
 __While loop__ repeats a statement or group of statements while a given condition is _TRUE_. It tests the condition before executing the loop body.
@@ -277,7 +276,7 @@ $ ./example_while_loop.py
 Flow of the code:
 
 <p align="center">
-<img src="while_loop.png" alt="Conditional" width="300">
+<img src="../img/while_loop.png" alt="Conditional" width="300">
 </p>
 
 Loops (repeated steps) ha‰ve _iteration variables_ that change each time through a loop (like _n_).  Often these _iteration variables_ go through a sequence of numbers.
diff --git a/Chapter_1_Python/Python_warmup.pdf b/Chapter_1_Python/Python_warmup.pdf
new file mode 100644
index 0000000..ffab0c3
Binary files /dev/null and b/Chapter_1_Python/Python_warmup.pdf differ
diff --git a/Chapter_2_RPi/RPi_GPIO.md b/Chapter_2_RPi/RPi_GPIO.md
new file mode 100644
index 0000000..107d639
--- /dev/null
+++ b/Chapter_2_RPi/RPi_GPIO.md
@@ -0,0 +1,282 @@
+# Raspberry Pi GPIOzero
+
+1. [Materials needed](#materials-needed)
+2. [GPIO pinout](#gpio_pinout)
+3. [Analog vs. Digital](#analog-vs-digital)
+4. [Blink](#blink)
+5. [LED PWM](#led-pwm)
+6. [Button](#button)
+7. [Combining everything](#combining-everything)
+
+Your Raspberry Pi is more than just a small computer, it is a hardware prototyping tool! The RPi has **bi-directional I/O pins**, which you can use to drive LEDs, spin motors, or read button presses. To drive the RPi's I/O lines requires a bit or programming. You can use a [variety of programing languages](http://elinux.org/RPi_GPIO_Code_Samples), but we decided to use a really solid, easy tools for driving I/O: **Python**.
+
+### Materials needed
+
+* Raspberry Pi 3 B
+* [Breadboard](https://www.sparkfun.com/products/12002?_ga=1.251311686.1915117394.1476705504)
+* [Jumper Wires(M/F)](https://www.sparkfun.com/products/12794)
+* [Momentary Pushbutton Switch](https://www.sparkfun.com/products/9190?_ga=1.213562324.1915117394.1476705504)
+* [Resistors](https://www.sparkfun.com/products/11507?_ga=1.213562324.1915117394.1476705504)
+* [2 LEDs](https://www.sparkfun.com/products/9590?_ga=1.213548756.1915117394.1476705504)
+
+###  GPIO Pinout
+
+Raspberry has its GPIO over a standard male header on the board. From the first models to the latest, the header has expanded from 26 pins to 40 pins while maintaining the original pinout.
+
+<p align="center">
+<img src="../img/rpi_old_new_pin.jpg" alt="rpi" width="500">
+</p>
+
+There are (at least) two, different numbering schemes you may encounter when referencing **Pi pin numbers**:
+
+1. **Broadcom (SoC) chip-specific** pin numbers.
+2. **P1 physical** pin numbers.
+
+You can use either number-system, but when you are programming how to use the pins, it requires that you declare which scheme you are using at the very beginning of your program. We will see this later.
+
+The next table shows all 40 pins on the P1 header, including any particular function they may have, and their dual numbers:
+
+<p align="center">
+<img src="../img/header_pinout.jpg" alt="pin" width="500">
+</p>
+
+In the next table, we show another numbering system along with the ones we showed above: **Pi pin header numbers and element14 given names, wiringPi numbers, Python numbers, and related silkscreen on the wedge**. The Broadcom pin numbers in the table are related to RPi Model 2 and later only.
+
+<p align="center">
+<img src="../img/Pi_pin_header_numbers.png" alt="pin" width="500">
+</p>
+
+This table shows that the RPi not only gives you access to the bi-directional I/O pins, but also [Serial (UART)](https://learn.sparkfun.com/tutorials/serial-communication), [I2C](https://learn.sparkfun.com/tutorials/i2c), [SPI](https://learn.sparkfun.com/tutorials/serial-peripheral-interface-spi), and even some Pulse width modulation ([PWM](https://learn.sparkfun.com/tutorials/pulse-width-modulation) — “analog output”).  
+
+There is a useful online guide for finding the assignment and numbering of each pin, along with other guides, that you may find useful at: [pinout.xyz](pinout.xyz)
+
+##### Analog vs. Digital
+
+Before starting with our practise, we will revise the difference between **analog** and **digital** signals. Both are used to transmit information, usually through **electric signals**. In both these technologies, the information, such as any audio or video, is transformed into electric signals. The **difference between analog and digital**:
+
+* In **analog technology**, information is translated into electric pulses of varying amplitude.
+
+* In **digital technology**, translation of information is into binary format (zero or one) where each bit is representative of two distinct amplitudes.
+
+<img src="../img/analog_digital.png" alt="pin" style="width: 300px;"/>
+
+##### Comparison chart
+
+||Analog	|Digital|
+|:------|:-------|:-------|
+|**Signal**| Analog signal is a continuous signal which represents physical measurements.|	Digital signals are discrete time signals generated by digital modulation.|
+|**Waves**|	Denoted by sine waves.|	Denoted by square waves.|
+|**Representation**| Uses continuous range of values to represent information.|	Uses discrete or discontinuous values to represent information.|
+|**Example**|	Human voice in air, analog electronic devices.|	Computers, CDs, DVDs, and other digital electronic devices.|
+|**Technology**| Analog technology records waveforms as they are.|	Samples analog waveforms into a limited set of numbers and records them.|
+|**Data transmissions**|Subjected to deterioration by noise during transmission and write/read cycle.|Can be noise-immune without deterioration during transmission and write/read cycle.|
+|**Response to Noise**|	More likely to get affected reducing accuracy|	Less affected since noise response are analog in nature|
+|**Flexibility**|	Analog hardware is not flexible.|Digital hardware is flexible in implementation.|
+|**Uses**|Can be used in analog devices only. Best suited for audio and video transmission.|	Best suited for Computing and digital electronics.|
+|**Applications**|Thermometer|PCs, PDAs|
+|**Bandwidth**|	Analog signal processing can be done in real time and consumes less bandwidth.|	There is no guarantee that digital signal processing can be done in real time and consumes more bandwidth to carry out the same information.|
+|**Memory**| Stored in the form of wave signal.|Stored in the form of binary bit.|
+|**Power**|	Analog instrument draws large power.|	Digital instrument drawS only negligible power.|
+|**Cost**|Low cost and portable.|	Cost is high and not easily portable.|
+|**Impedance**|	Low	|High order of 100 megaohm|
+|**Errors**|Analog instruments usually have a scale which is cramped at lower end and give considerable observational errors.|	Digital instruments are free from observational errors like parallax and approximation errors.|
+
+### Blink
+We will start with a very easy example, the classic "Blink" example, later we will do the same with our Arduino and see the differences.
+
+##### Hardware Setup
+We start assembling the circuit as shown in the diagram below.
+
+![Wiring](../img/raspi-blink-wiring.png)
+
+##### Code
+For the code we are going to use the [GPIOzero](https://gpiozero.readthedocs.io/en/stable/) library which is a  on the GPIO library (https://sourceforge.net/p/raspberry-gpio-python/wiki/Home/).
+
+1. From your laptop's terminal connect to the RPi
+2. Create a folder called "code" and inside it a file called "blinker.py":
+```bash
+$ mkdir code
+$ cd code
+$ nano blinker.py
+```
+Note: you may not need to create a new folder everytime for the script. I.e. once you have created the folder code, you can create the scripts within the folder with nano <script name>. The command nano in this case is to open the nano editor.
+
+3. Copy and paste this code:
+```python
+#!/usr/bin/env python
+
+from gpiozero import LED
+from time import sleep
+
+led = LED(17)
+
+while True:
+    led.on()
+    sleep(1)
+    led.off()
+    sleep(1)
+
+```
+
+4. Save and exit
+
+5. Run this script with the command:
+```bash
+sudo python ./blinker.py
+```
+6. To stop the script from running press CTRL+C
+
+7. To make the script an executable run:
+```bash
+$ sudo chmod u+x blinker.py
+```
+Now you can execute it with just this command:
+```bash
+$ ./blinker.py
+```
+8. Yay! The LED is blinking!
+
+##### Understanding the "Blink" example
+
+```python
+#!/usr/bin/env python
+```
+This line is used to tell which interpreter (in our case Python) to use when the file is made into an executable.
+
+
+
+When we use Python to control our GPIO pins, we always need to import the corresponding Python module, which goes at the top of the script:
+```python
+import gpiozero as gpio
+```
+Here, we are giving a shorter name to the module “GPIOzero”, in order to call the module through our script. This line is fundamental for every script requiring GPIO functions. If you want to import only certain classes from GPIOzero you could also sepcify the components. As an example, let's say if you are interested in only the LED:
+```python
+from gpiozero import LED
+```
+Or if want to use the Button and LED class.
+```python
+from gpiozero import LED, Button
+```
+And if we are just importing the function sleep from the [time library](https://www.tutorialspoint.com/python/time_sleep.htm), we will later use it to make the LED blink.
+```python
+from time import sleep
+```
+
+In the next line:
+```python
+led = LED(17)
+```
+Here we are creating a variable called `led` and we are initialising it with an object of the class [LED](https://gpiozero.readthedocs.io/en/stable/api_output.html#led). On object of the class LED to be initialised takes as a parameter the pin number to which the LED is connected to, in our case the pin number is 17 (GPIO17, not physical pin number 17).
+**Note:** GPIOzero uses ONLY Broadcom (BCM) pin numbering, instead of physical pin numbering and it is not configurable, so when referring to pins in one of your scripts always use this numbering:  
+
+![Broadcom](../img/broadcom_pin_layout.svg)
+
+
+
+```python
+while True:
+```
+Here we are are basically asking to Python to loop forever. In fact the `while` statements loops through its code until the initial condition becomes false, in our case never.
+
+
+
+```python
+led.on()
+sleep(1)
+led.off()
+sleep(1)
+```
+Here we are using two methods of the class [LED](https://gpiozero.readthedocs.io/en/stable/api_output.html#led) pf GPIOzero. `on()` switches the device on and `off` turns it off. We are calling the two functions with a 1 second interval, in fact the function `sleep` suspends execution for the given number of seconds.
+
+### LED PWM
+Use the same layout for the electronics as before.
+
+##### What is PWM?
+Pulse Width Modulation, or PWM, is a technique for getting analog results with digital means. Digital control is used to create a square wave, a signal switched between on and off. This on-off pattern can simulate voltages in between full on (3.3 Volts for RPi and 5 Volts for Arduino) and off (0 Volts) by changing the portion of the time the signal spends on versus the time that the signal spends off. The duration of "on time" is called the pulse width. To get varying analog values, you change, or modulate, that pulse width. If you repeat this on-off pattern fast enough with an LED for example, the result is as if the signal is a steady voltage between 0 and 5v controlling the brightness of the LED.
+
+For more information check out [this link](https://learn.sparkfun.com/tutorials/pulse-width-modulation).
+
+##### Code
+Repeat the same steps of "Blink" to upload the code below, this time call the file *led-pwm.py* and save it in the *code* folder that we have previously created. It's up to you to make the code executable or not.
+```python
+#!/usr/bin/env python
+
+from gpiozero import PWMLED
+from time import sleep
+
+led = PWMLED(17)
+
+while True:
+    led.value = 0  # off
+    sleep(1)
+    led.value = 0.5  # half brightness
+    sleep(1)
+    led.value = 1  # full brightness
+    sleep(1)
+```
+
+##### Understanding "LED PWM" code
+
+The main difference here is that we are using the [class PWMLED](https://gpiozero.readthedocs.io/en/stable/api_output.html#gpiozero.PWMLED) instead of the class LED. The PWMLED class has an extra parameter that we can tweak which is `value`. `value` indicates the duty cycle of this PWM device. 0.0 is off, 1.0 is fully on. Values in between may be specified for varying levels of power in the device.
+
+### Button
+
+##### Hardware Setup
+We start assembling the circuit as shown in the diagram below.
+
+![Wiring](../img/button-wiring.png)
+
+##### Code
+Repeat the same steps of "Blink" to upload the code below, this time call the file *button.py* and save it in the *code* folder that we have previously created. It's up to you to make the code executable or not.
+
+```python
+#!/usr/bin/env python
+
+from gpiozero import Button
+
+button = Button(2)
+buttonWasPressed = False # 1st flag
+buttonWasReleased = False # 2nd flag
+
+while True:
+    if button.is_pressed:
+        buttonWasReleased = False
+        if not buttonWasPressed:
+            print("Button is pressed")
+            buttonWasPressed = True
+    else:
+        buttonWasPressed = False
+        if not buttonWasReleased:
+            print("Button is released")
+            buttonWasReleased = True
+```
+
+##### Understanding "Button" code
+Here we are using the [class Button](https://gpiozero.readthedocs.io/en/stable/api_input.html#button) from GPIOzero. This class has many functions and parameter, so make sure you check out the reference. Here we are using the `is_pressed` property of the class. `is_pressed` returns True if the device is currently active and False otherwise.
+
+In this example, we also introduce the concept of flags. Flags are a way to help us keep track of the binary state of a particular thing by storing them as boolean variables (1/0 or True/False). In this case, we need to keep track of the binary state of whether the button is was pressed, and the binary state of whether the button was released.  
+
+> **Note** that we need to keep track of the _actions_ that occured, not the state of the button itself as this is already monitored `is_pressed` property of the `Button()` class.
+
+In the code above, we use these flags to prevent the repetition of a print statement. i.e. If we did not have them, then the _"Button is released"_ statement would print repetitively until the button was pressed, and vice versa.
+
+Flags allow us to ensure the print statement is only _printed_ on the first iteration of the loop. Every iteration thereafter will skip the print statement. This occurs until there is a change in the `is_pressed` property, at which point the respective flag is reset to `False`.
+
+
+### Combining Everything
+
+Now we challenge you to combine all the previous three scripts to create one. Make the script in order that:
+* when the button is pressed one of the two leds fades to 25% of its brightness and the other one blinks once
+* when the button is released the pwmled goes back to 100% brightness.
+
+##### Hardware Setup
+We start assembling the circuit as shown in the diagram below.
+
+![Wiring](../img/practise_1.png)
+
+##### Code Tips
+Use the `when_pressed` and `when_released` properties of the [Button class](https://gpiozero.readthedocs.io/en/stable/api_input.html#button).
+[Here](https://gpiozero.readthedocs.io/en/stable/recipes.html#button-controlled-led) you can find the code to control one LED with the button.
+
+###### Acknowledgement:
+<small>Based on the GPIOzero library [notes](https://gpiozero.readthedocs.io/en/stable/index.html) and [this reference](http://www.diffen.com/difference/Analog_vs_Digital) and [this intro](https://learn.sparkfun.com/tutorials/raspberry-gpio). </small>
diff --git a/Chapter_2_RPi/RPi_setup.md b/Chapter_2_RPi/RPi_setup.md
new file mode 100644
index 0000000..24f6552
--- /dev/null
+++ b/Chapter_2_RPi/RPi_setup.md
@@ -0,0 +1,294 @@
+# Setting up your Raspberry Pi 3 Model B
+
+The goal of this first session is to set up our Raspberry Pis, so they can run "headless". This means that we will be able to control the RPi remotely from our laptops, without the need to connect the RPi to a screen, keyboard and mouse each time we use it. This initial setup, therefore, reduces the time we spend in setting up our Rpi each time we use it and minimizes the cabling, this, will be fundamental when our Pi will be inserted in our Pixel.
+
+We will use the [SSH](https://en.wikipedia.org/wiki/Secure_Shell) protocol to connect from our laptop to the RPi over the Imperial/eduroam WiFi network. It let us establish a secure network communication on an unsecured network. To achieve this we will rely on remot3.it services as we will later explain.
+
+To setup our RPi we will use the terminal. If you are new to the terminal can be a bit overwhelming at first, don't panic and follow the steps carefully!
+We have created a [cheat sheet](../Introductory_Material/Cheat_sheet_bash_Linux.md) to help you out.
+
+## Hardware Setup for Raspberry Pi
+
+At first we will setup the RPi using peripherals. Each team should get the following equipment:
+
+  * 1 Touchscreen
+  * 1 Raspberry to touchscreen HDMI-HDMI plug
+  * 1 Touchscreen pen
+  * 1 Raspberry Pi Power Supply
+  * 1 Raspberry Pi
+  * 1 Keyboard
+  * 1 SD Card
+  * 1 Wooden plate
+  * 8 M2.5 Bolts
+  * 4 M2.5 Standoffs
+  * 3 M3 Bolts
+  * 4 M3 Spacers
+  * 4 M3 Nuts
+  * 1 Breadboard
+  * 1 Arduino
+  * 1 USB A to USB B Cable
+  * 1 Screwdriver
+  * 1 Pair of Pliers
+
+![Provided Material](../img/provided-material.jpg)
+
+1. Attach the Raspberry Pi to the wooden plate, first bolt the 4 M2.5 Standoffs to the plate and then attach the RPi to the plate with 4 more bolts (don't tighten them too much):
+
+<img src="../img/assembly-rspi.jpg" alt="pheriperals-setup" style="width: 400px;"/>
+
+2. Repeat the same operation with the Arduino using the M3 spacers, nuts and bolts. You will be able only to secure it with three bolts, remember not to tighten them too much:
+
+<img src="../img/assembly-arduino.jpg" alt="pheriperals-setup" style="width: 400px;"/>
+
+3. To attach the breadboard to the wooden plate, peel off the back of it to expose the adhesive strip and glue it to the wooden plate:
+
+<img src="../img/assembly-sticky_back.JPG" alt="pheriperals-setup" style="width: 400px;"/>
+
+![Full assembly](../img/assembly-final.JPG)
+
+4. Insert the micro-SD card in the back of the RPi, like so:
+
+<img src="../img/assembly-rpi_sd.JPG" alt="SD-slot" style="width: 400px;"/>
+
+5. Connect the touchscreen to the RPi, connecting it to the pins and with the HDMI plug, like so:
+
+<img src="../img/assembly-screen.jpg" alt="pheriperals-setup" style="width: 400px;"/>
+
+6. Connect the keyboard with the USB.
+
+![Keyboard](../img/assembly-keyboard.JPG)
+
+7. Using the power cable, power up the RPi and the screen:
+
+![Power](../img/assembly-power.JPG)
+
+8. The RPi will start the setup, if the screen doesn't illuminate check that it is on.
+
+**Note:** The SD we have provided has [NOOBS](https://www.raspberrypi.org/downloads/noobs/) with the [Raspbian OS](https://www.raspberrypi.org/downloads/raspbian/) already installed. We have also added the drivers for the touchscreen. [Here](https://www.waveshare.com/wiki/5inch_HDMI_LCD) you can find additional steps to modify the configuration of the touchscreen.
+
+## System setup for Raspberry Pi
+
+Now we will start running some commands in the terminal.  We will run them as a **root user**, the root has the permission to modify files or default settings as administrator. By default on Raspbian (the operating system of our RPIs) the **root user** is **pi** and the **root password** associated to the root user is **raspberry**.
+To operate as a root user in the terminal every command is preceded by the ```sudo``` command.
+
+> _**TIP:** Following the new kernal update "Stretched" released in September. Some user has found that their settings get resetted after reboot. If so, please setup your Raspi Configuration using within the X-Environment -> Click on Raspbian Icon -> Preference -> Raspberry Pi Settings._
+
+1. Type the following command and press 'Enter' to open the configuration menu of the RPi:
+
+``` bash
+$ sudo raspi-config
+```
+
+The terminal will show a menu. The options can be navigated with the vertical keys of your keyboard, to accept the options press 'Enter', to finish press the lateral keys of the keyboard.
+
+<img src="../img/raspi-config.png" alt="screen" style="width: 400px;"/>
+
+2. First we set up the keyboard to prevent any problem when we will change the root password. We access the option: __4 Localisation Options__:
+
+<img src="../img/localisation-options.png" alt="localisation-options" style="width: 400px;"/>
+
+Then __Change Keyboard Layout__:
+
+<img src="../img/keyboard-layout.png" alt="localisation-options" style="width: 400px;"/>
+
+Then we choose __Generic 105 key__:
+
+<img src="../img/generic-105.png" alt="localisation-options" style="width: 400px;"/>
+
+And then __English (UK)__:
+
+<img src="../img/english-uk.png" alt="localisation-options" style="width: 400px;"/>
+
+Then we can choose the default options that the menu is prompting by pressing enter:
+
+<img src="../img/default-layout.png" alt="localisation-options" style="width: 400px; "/>
+
+<img src="../img/no-compose.png" alt="localisation-options" style="width: 400px; "/>
+
+<img src="../img/terminate-server.png" alt="localisation-options" style="width: 400px; "/>
+
+3. Then we are re-directed to the main menu, now we change the timezone from the __4 Localisation Options__ menu.
+<img src="../img/localisation-options.png" alt="localisation-options" style="width: 400px; "/>
+
+Then we choose __Change Timezone__:
+
+<img src="../img/change-timezone.png" alt="localisation-options" style="width: 400px; "/>
+
+Then __Europe__:
+
+<img src="../img/europe.png" alt="localisation-options" style="width: 400px; "/>
+
+Then __London__:
+
+<img src="../img/london.png" alt="localisation-options" style="width: 400px; "/>
+
+4. Now we will change the root user password. This increases the security of the connection we will establish from our laptop to the RPi. Since you are sharing this RPi with your teammates choose a password together. To change the password we are re-directed to the main menu and here we choose the first option: __1 Change User Password__:
+
+<img src="../img/change-password.png" alt="localisation-options" style="width: 400px; "/>
+
+Then we agree to change the password:
+
+<img src="../img/password-ok.png" alt="localisation-options" style="width: 400px; "/>
+
+Type the new password twice:
+
+<img src="../img/typing-password.png" alt="localisation-options" style="width: 400px; "/>
+
+<img src="../img/password-changed-ok.png" alt="localisation-options" style="width: 400px; "/>
+
+We have set the new password. Do not reboot the RPi yet.
+
+5. Lastly we will check that the SSH is enabled. We need to enable it to connect with the RPi remotely. From the main menu we access: __5 Interfacing Options__:
+
+<img src="../img/interfacing-options.png" alt="localisation-options" style="width: 400px; "/>
+
+Then we select __SSH__:
+
+<img src="../img/ssh.png" alt="localisation-options" style="width: 400px; "/>
+
+Then we confirm that we want to enable the SSH server:
+
+<img src="../img/ssh-enabling.png" alt="localisation-options" style="width: 400px; "/>
+
+We confirm again:
+
+<img src="../img/ssh-is-enabled.png" alt="localisation-options" style="width: 400px;"/>
+
+6. Exit the menu by pressing the right arrow twice to select __Finish__ and enter. You will re-enter the terminal.
+
+## Setting up the WiFi from Imperial College network with a guest account
+
+In the classroom you will be given a guest username (i.e *guest000000*, 'guest' followed by a sequence of 6 digits) and a guest password (8 characters long, alphanumeric). We are going to modify a modify a configuration file called  *wpa_supplicant.conf*.
+
+**Note:** The guest account is valid for 90 days only. So you should change the setting with your personal college credentials. The steps are similar to the following ones and we have prepared a tutorial [here](../SupplementaryMaterial/AlternativeNetworkSettings.md). It also includes setup for the **eduroam** network.
+
+1. First we back up the configuration file *wpa_supplicant.conf*. We create the backup file *wpa_supplicant.conf_backup* in case we need to restore it later. _It's important that you don't edit this backup after creating it_. To do so we enter the command:
+```
+  $ sudo cp /etc/wpa_supplicant/wpa_supplicant.conf /etc/wpa_supplicant/wpa_supplicant.conf_backup
+```
+
+ 2. Then we edit the *wpa_supplicant.conf*. The default text editor installed in the RPi is _nano_. To edit a file with the nano editor is sufficient to enter the command ```nano /path/to/file```. Therefore to edit *wpa_supplicant.conf* we enter the following command with admin user permission:
+ ```bash
+ $ sudo nano /etc/wpa_supplicant/wpa_supplicant.conf
+ ```
+
+ This file should just have the next line at the beginning:
+ ```bash
+ ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
+ update_config=1
+ ```
+
+ 3. Then we add to the content of *wpa_supplicant.conf* the lines after # IC (**the configuration is case sensitive, so make sure you do not have typos**):
+
+ ```bash
+ ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
+ update_config=1
+
+
+ # IC
+ network={
+          ssid="Imperial-WPA"
+          proto=RSN
+          key_mgmt=WPA-EAP
+          pairwise=CCMP
+          auth_alg=OPEN
+          eap=PEAP
+          identity="ic\guest000000"
+          password="YOUR_PASSWORD"
+ }
+ ```
+
+ Where *guest000000* has to be replaced with the actual guest account and YOUR_PASSWORD with the password associated to it.
+
+ In the nano editor, to exit, press _"ctrl + x"_. The editor will then present you with different options such as save the file or exit without modifying the file: _y/n_. We type _"y"_ and then press _enter_. The editor now asks us for the name of the file we are saving, but as it already fills out the previous name for us, we press _enter_ again.
+
+ 5. Now we can check if the connection works by rebooting your RPi. Reboot it by entering:
+ ``` bash
+ $ reboot
+ ```
+ One the system starts again the RPi should connect automatically to the WiFi.
+
+
+ ### Step 2: Encrypting Your Password
+
+ 1. In order not to store the password in a plain text we substitute our password with an **encrypted** one using  a **MD4 hash generator**. You can generate the hash with the following Linux command:
+
+ ```bash
+ $ echo -n 'YOUR_PASSWORD' | iconv -t utf16le | openssl md4
+ ```
+
+ You will have to substitute 'YOUR_PASSWORD' with the password related to the account in the *wpa_supplicant.conf*. This will be the only time you'll have to type it in plain text. Ask your teammates to look away from the screen if you are not comfortable in them seeing your password.
+
+ 2. The previous command will display the encrypted password on your terminal like this:
+ ```bash
+ $ (stdin)= a6c71eedc2eacbca84003336a4a62a1c
+ ```
+ We copy the string that was generated in your terminal screen (i.e. 'a6c71eedc2eacbca84003336a4a62a1c' in the example).
+
+ **Note:** Also you can save the hash from your password in a file and then read its content:
+ ```bash
+ $ echo -n 'YOUR_PASSWORD' | iconv -t utf16le | openssl md4 > hash.txt
+ $ cat hash.txt
+ ```
+ The first command creates the encrypted password and stores it in the __hash.txt__ file.
+ The second command reads the content of the __hash.txt__ file.
+ In general we use the `cat` command to read and concatenate files.
+
+ 3. Then we open again the *wpa_supplicant.conf* with:
+
+ ```bash
+ $ sudo nano /etc/wpa_supplicant/wpa_supplicant.conf
+ ```
+ 4. In the password field replace "YOUR_PASSWORD" with the string you generated as hexadecimal characters, adding the 'hash:' prefix as shown in the example bellow:
+
+ ```bash
+ # IC
+ network={
+         ssid="Imperial-WPA"
+         proto=RSN
+         key_mgmt=WPA-EAP
+         pairwise=CCMP
+         auth_alg=OPEN
+         eap=PEAP
+         identity="guest000000"
+         password=hash:a6c71eedc2eacbca84003336a4a62a1c
+ }
+ ```
+ 5. The last security step to perform is to remove the bash history (the one that stores all the commands we had typed on the terminal). Therefore, we enter the following commands:
+ ```bash
+ $ history -w
+ $ history -c
+ ```
+ 6. Then we reboot the RPi to check that the password was properly set up with:
+ ```bash
+ $ reboot
+ ```
+ 7. And you are done!
+
+
+## Installing Python
+
+To install Linux packages in our RPi system we use the command: ```sudo apt-get install <name_of_package>``` in the terminal. Each installation could take some minutes.
+
+1. Updating operative system
+```bash
+sudo apt-get update
+```
+2. Installing C lib needed by Python
+```bash
+sudo apt-get -y install libffi-dev
+sudo apt-get -y install libssl-dev
+```
+3. Installing Pythons
+```bash
+sudo apt-get -y install build-essential python-dev python-openssl
+sudo apt-get -y install python-setuptools
+sudo apt-get -y remove --purge python-pip
+sudo apt-get -y install python-pip
+sudo pip install --upgrade pip
+```
+
+We suggest that after this lesson you back up the image of your RPi at home to have a copy af this . In order to do so we have prepared a [guide](../SupplementaryMaterial/Backing_up_RPi.md).
+
+
+#### [Next Step](../Chapter_5_Remote/Remote_Rpi.md)
diff --git a/Chapter_3_Arduino/Arduino_intro.md b/Chapter_3_Arduino/Arduino_intro.md
new file mode 100644
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--- /dev/null
+++ b/Chapter_3_Arduino/Arduino_intro.md
@@ -0,0 +1,317 @@
+# What is Arduino?
+
+1. [Arduino UNO Board Structure](#physical-structure-of-an-arduino-uno-board)
+2. [Configuring the pins on Arduino](#configuring-the-pins-on-arduino)
+3. [Quick tour of the Arduino IDE](#quick-tour-of-the-arduino-ide)
+4. [Anatomy of an Arduino Sketch](#anatomy-of-an-arduino-sketch)
+5. [Arduino Language and Syntax](#arduino-language)
+
+<img src="../img/arduino-environment.png" alt="arduino-environment" style="width: 400px;"/>
+
+### What is Arduino: Hardware
+An Arduino is essentially a microcontroller. That is a small "computer" (SoC - System on a Chip) on a single integrated
+circuit containing a processor core, memory and programmable input/output peripherals (a.k.a. sensors and actuators).
+
+#### Physical structure of an Arduino UNO board
+
+<img src="../img/board_anatomy.png" alt="arduino-anatomy" style="width: 400px;"/>
+
+1. Digital pins Use these pins with digitalRead(), digitalWrite(), and analogWrite(). analogWrite() works only on the pins with the PWM symbol.
+2. Pin 13 LED The only actuator built-in to your board. Besides being a handy target for your first blink sketch, this LED is very useful for debugging.
+3. Power LED Indicates that your Arduino is receiving power. Useful for debugging.
+4. ATmega microcontroller The heart of your board.
+5. Analog in Use these pins with analogRead().
+6. GND and 5V pins Use these pins to provide +5V power and ground to your circuits.
+7. Power connector This is how you power your Arduino when it’s not plugged into a USB port for power. Can accept voltages between 7-12V.
+8. TX and RX LEDs These LEDs indicate communication between your Arduino and your computer. Expect them to flicker rapidly during sketch upload as well as during serial communication. Useful for debugging.
+9. USB port Used for powering your Arduino Uno, uploading your sketches to your Arduino, and for communicating with your Arduino sketch (via Serial. println() etc.).
+10. Reset button Resets the ATmega microcontroller.
+
+Here's a scheme of it's pin's functionalities:
+
+![Arduino GPIO](../img/ArduinoUNO-GPIO.jpg)
+
+### Configuring the pins on Arduino
+
+##### Digital Pins (GPIO)
+
+All the pins on the Arduino are programmable. They can be configured as either inputs or outputs using the ```pinMode()``` function.
+They can be controlled with two functions:
+  + ```digitalRead()```: reads the value of the pin
+  + ```digitalWrite()```: sets the output of the pin to either HIGH (1, drives the pin to 5V) or LOW (0, drives the pin to 0V)
+We will see in detail how to control them later on.
+
+###### Pins Configured as INPUT
+
+Arduino (Atmega) pins default to inputs, so they don't need to be explicitly declared as inputs with pinMode() when you're using them as inputs. Pins configured this way are said to be in a high-impedance state. Input pins make extremely small demands on the circuit that they are sampling. This means that it takes very little current to move the input pin from one state to another, and can make the pins useful for such tasks as implementing a capacitive touch sensor, reading an LED as a photodiode, or reading an analog sensor with a scheme such as RCTime.
+
+This also means however, that pins configured as `pinMode(pin, INPUT)` with nothing connected to them, or with wires connected to them that are not connected to other circuits, will report seemingly random changes in pin state, picking up electrical noise from the environment, or capacitively coupling the state of a nearby pin.
+
+###### Pins Configured as INPUT with Pullup/Pulldown Resistors
+
+Often it is useful to steer an input pin to a known state if no input is present. In doing so you cancel the random values of the pin when nothing is connected to it. This can be done by adding a pullup resistor (to +5V), or a pulldown resistor (resistor to ground) on the input. A 10K resistor is a good value for a pullup or pulldown resistor.
+
+**Note:** On the Arduino there are built-in pullup resistors that can be activate via code setting `pinMode()` as INPUT_PULLUP. This effectively inverts the behavior of the INPUT mode, where HIGH means the sensor is off, and LOW means the sensor is on.
+
+When connecting a sensor to a pin configured with INPUT_PULLUP, the other end should be connected to ground. In the case of a simple switch, this causes the pin to read HIGH when the switch is open, and LOW when the switch is pressed.
+
+You can find more information about pullup/pulldown resistors [here](https://playground.arduino.cc/CommonTopics/PullUpDownResistor).
+
+###### Pins configured as OUTPUT
+
+Pins configured as OUTPUT with pinMode() are said to be in a low-impedance state. This means that they can provide a substantial amount of current to other circuits. Atmega pins can source (provide positive current) or sink (provide negative current) up to 40 mA (milliamps) of current to other devices/circuits. This is enough current to brightly light up an LED (don't forget the series resistor), or run many sensors, for example, but not enough current to run most relays, solenoids, or motors.
+
+Short circuits on Arduino pins, or attempting to run high current devices from them, can damage or destroy the output transistors in the pin, or damage the entire Atmega chip. Often this will result in a "dead" pin in the microcontroller but the remaining chip will still function adequately. For this reason it is a good idea to connect OUTPUT pins to other devices with 470Ω or 1k resistors, unless maximum current draw from the pins is required for a particular application.
+
+##### Analog Pins
+
+The Atmega controllers used for the Arduino contain an onboard 6 channel analog-to-digital (A/D) converter, that correspond to the analog pins (A0-A5). The converter has 10 bit resolution, returning integers from 0 to 1023.  This means that when we want to read the pin's value it maps input voltages between 0 and 5 volts into integer values between 0 and 1023.  
+The analog pins can be controlled with two functions:
++ ```analogRead()```: reads the value of the pin
++ ```analogWrite()```: sets the output value of the pin
+
+While the main function of the analog pins for most Arduino users is to read analog sensors, the analog pins also have all the functionality of general purpose input/output (GPIO) pins (the same as digital pins 0 - 13). Therefor they can used as digital pins with the digital functions.
+
+The Atmega datasheet also cautions against switching analog pins in close temporal proximity to making A/D readings (analogRead) on other analog pins. This can cause electrical noise and introduce jitter in the analog system. It may be desirable, after manipulating analog pins (in digital mode), to add a short delay before using `analogRead()` to read other analog pins.
+
+#### PWM
+
+In the graphic below, the green lines represent a regular time period. This duration or period is the inverse of the PWM frequency. In other words, with Arduino's PWM frequency at about 500Hz, the green lines would measure 2 milliseconds each. A call to `analogWrite()` is on a scale of 0 - 255, such that `analogWrite(255)` requests a 100% duty cycle (always on), and `analogWrite(127)` is a 50% duty cycle (on half the time) for example.
+
+<img src="../img/pwm.png" alt="pwm" style="width: 400px;"/>
+
+**Note:** For more informations you can check the Arduino [Microcontroller section](https://www.arduino.cc/en/Tutorial/Foundations) of their Foundations.
+
+### What is Arduino: Software
+Please download the Arduino IDE from [Arduino's website](https://www.arduino.cc/en/Main/Software) if you are having any trouble there are setup guides for every operating system on [his page](https://www.arduino.cc/en/Guide/HomePage).
+
+#### Quick tour of the Arduino IDE
+
+Arduino has it's own integrated development environment that simplifies some of the operations. The IDE manages library, offers a built-in compiler and has a lot of examples and references.
+
+Here is a screnshot of how the IDE looks like and all its functionalities:
+
+<img src="../img/arduino_ide_annotated.png" alt="arduino-ide" style="width: 400px;"/>
+
+1. Verify: Compiles and approves your code. It will catch
+errors in syntax (like missing semi-colons or parenthesis).
+2. Upload: Sends your code to the Uno. When you click it, you
+should see the lights on your board blink rapidly.
+3. New: This buttons opens up a new code window tab.
+4. Open: This button will let you open up an existing sketch.
+5. Save: This saves the currently active sketch.
+6. Serial Monitor: This will open a window that displays any
+serial information your Uno Board is transmitting. It is very
+useful for debugging.
+7. Sketch Name: This shows the name of the sketch you are
+currently working on.
+8. Code Area: This is the area where you compose the code
+for your sketch.
+9. Message Area: This is where the IDE tells you if there were
+any errors in your code.
+10. Text Console: The text console shows complete error
+messages. When debugging, the text console is very useful.
+11. Board and Serial Port: Shows you what board and the
+serial port selections
+
+#### Anatomy of an Arduino Sketch
+<img src="../img/two-functions.png" alt="arduino-functions" style="max-width: 200px; display: inline-block;"/>
+
+<img src="../img/arduino-functions.png" alt="arduino-functions" style="max-width: 200px; display: inline-block;"/>
+
+Each Arduino program is called a "sketch". Each Sketch has two main function ```setup()``` and ```loop()```:
+  + ```setup()``` is called when a sketch starts. Use it to initialize variables, pin modes, start using libraries, etc. The setup function will only run once, after each powerup or reset of the Arduino board.
+  + ```loop()``` is called after ```setup()```, and it loops consecutively, allowing your program to change and respond. Use it to actively control the Arduino board.
+
+Here's an example of what an Arduino sketch looks like:
+```
+/*
+  Blink
+  Turns on an LED on for one second, then off for one second, repeatedly.
+
+  This example code is in the public domain.
+ */
+
+// Pin 13 has an LED connected.
+// give it a name:
+int pin = 13;
+
+// the setup routine runs once when you press reset:
+void setup() {                
+  // initialize the digital pin as an output.
+  pinMode(pin, OUTPUT);     
+}
+
+// the loop routine runs over and over again forever:
+void loop() {
+  digitalWrite(pin, HIGH);   // turn the LED on (HIGH is the voltage level)
+  delay(1000);               // wait for a second
+  digitalWrite(pin, LOW);    // turn the LED off by making the voltage LOW
+  delay(1000);               // wait for a second
+}
+```
+
+#### Arduino Language
+
+The programming language used in Arduino comes from C++ and it is quite different from Python. Although the names of the functions are self explanatory as they are written in plain English.
+
+The most visible difference is that you have to terminate each line with a semicolon (`;`) to end a statement, if you forget one the compiler will warn you about it.
+
+###### Variables
+
+The fundamental difference from Python is that Arduino doesn't use dynamic typing. Therefore when we create a variable we have to declare its type:
+
+`int pin = 13;`  
+
+We have just created a variable whose type is **int**, whose name is **pin**, whose **value** is 13.
+Later on in the program, you can refer to this variable by its name, at which point its value will be looked up and used. For example, in this statement:
+
+`pinMode(pin, OUTPUT);`  
+
+We are setting the pin 13 as an OUTPUT pin, what we have written would be equivalent to `pinMode(13, OUTPUT);`.
+You can change the value of a variable using an assignment (indicated by an equals sign). For example:
+
+`pin = 12;`  
+
+will change the value of the variable to 12. Notice that we don't specify the type of the variable: it's not changed by the assignment. That is, the name of the variable is permanently associated with a type; only its value changes.
+
+When you assign one variable to another, you're making a copy of its value and storing that copy in the location in memory associated with the other variable. Changing one has no effect on the other. For example, after:
+
+```
+int pin = 13;
+int pin2 = pin;
+pin = 12;
+```
+
+only pin has the value 12; pin2 is still 13.
+
+Arduino has many types. To name a few: int, float, string, boolean, char. To learn more about the specificities about each type we invite you to look at the [Arduino Reference Page](https://www.arduino.cc/en/Reference/HomePage).
+
+#### Further Arduino Syntax
+
+We have collected useful examples of Arduino syntax for some major functions you are familiar with in Python.
+
+###### If
+```
+if (pinFiveInput < 500){
+    // action A
+} else {
+    // action B
+}
+```
+
+###### While
+```
+while(expression){
+  // statement(s)
+}
+```
+
+###### For
+```
+for (int i=0; i <= 255; i++){
+      analogWrite(PWMpin, i);
+      delay(10);
+}
+```
+That can be translated in pseudocode as:
+```
+for (initialization; condition; increment) {
+    //statement(s);
+}
+```
+
+###### Comments
+For inline comments you can use `//` for multiple-lines comments instead use `/*` at the beginning and `*/` at the end.
+```
+//this is an inline comment  
+```
+```
+/*this is a comment  
+on multiple lines*/
+```
+
+###### Comparison Operators
++ `x == y (x is equal to y)`
++ `x != y (x is not equal to y)`
++ `x <  y (x is less than y)`
++ `x >  y (x is greater than y)`
++ `x <= y (x is less than or equal to y)`
++ `x >= y (x is greater than or equal to y)`
+
+###### Arithmetic Operations
+* = (assignment operator)
+* \+  (addition)
+* \- (subtraction)
+* \* (multiplication)
+* / (division)
+* % (modulo)
+
+###### Boolean Operations
+* && (and)
+* || (or)
+* ! (not)
+
+###### Functions
+Segmenting code into functions allows a programmer to create modular pieces of code that perform a defined task and then return to the area of code from which the function was "called". The typical case for creating a function is when one needs to perform the same action multiple times in a program.
+Standardising code fragments into functions has several advantages:
+
+- Functions help the programmer stay organised. Often this helps to conceptualise the program.
+- Functions codify one action in one place so that the function only has to be thought out and debugged once.
+- This also reduces chances for errors in modification, if the code needs to be changed.
+- Functions make the whole sketch smaller and more compact because sections of code are reused many times.
+- They make it easier to reuse code in other programs by making it more modular, and as a nice side effect, using functions also often makes the code more readable.
+There are two required functions in an Arduino sketch, setup() and loop(). Other functions must be created outside the brackets of those two functions. As an example, we will create a simple function to multiply two numbers.
+
+![Function Anatomy](../img/function-anatomy.png)
+
+Our function needs to be declared outside any other function, so "myMultiplyFunction()" can go either above or below the "loop()" function.
+
+```
+void setup(){
+  Serial.begin(9600);
+}
+
+void loop() {
+  int i = 2;
+  int j = 3;
+  int k;
+
+  k = myMultiplyFunction(i, j); // k now contains 6
+  Serial.println(k);
+  delay(500);
+}
+
+int myMultiplyFunction(int x, int y){
+  int result;
+  result = x * y;
+  return result;
+}
+```
+**Another Example**
+This function will read a sensor five times with analogRead() and calculate the average of five readings. It then scales the data to 8 bits (0-255), and inverts it, returning the inverted result.
+```
+int ReadSens_and_Condition(){
+  int i;
+  int sval = 0;
+
+  for (i = 0; i < 5; i++){
+    sval = sval + analogRead(0);    // sensor on analog pin 0
+  }
+
+  sval = sval / 5;    // average
+  sval = sval / 4;    // scale to 8 bits (0 - 255)
+  sval = 255 - sval;  // invert output
+  return sval;
+}
+```
+
+To call our function we just assign it to a variable, the following code should be placed inside `loop`.
+```
+int sens;
+sens = ReadSens_and_Condition();
+```
+
+For further reference about the syntax and language you can check these notes:
+https://www.arduino.cc/en/Tutorial/Variables
+https://www.arduino.cc/en/Reference/HomePage
diff --git a/Chapter_3_Arduino/Arduino_warmup.md b/Chapter_3_Arduino/Arduino_warmup.md
new file mode 100644
index 0000000..ca0a5d9
--- /dev/null
+++ b/Chapter_3_Arduino/Arduino_warmup.md
@@ -0,0 +1,143 @@
+# Arduino Practise
+
+In this section we are going to see the Arduino equivalent of the scripts we ran from the Raspberry Pi.
+
+1. [Blink](#blink)
+2. [LED PWM](#led-pwm)
+3. [Button](#button)
+4. [Combining everything](#combining-everything)
+
+### Blink
+
+We are going to run the "blink" sketch we have seen early on in this tutorial. It is the most basic sketch a sort of "Hello World!" for Arduino. It makes the built-in LED on pin 13 blink in intervals of 1 second.
+
+1. Connect the Arduino to your laptop with the USB cable
+
+2. Open the IDE
+![IDE](../img/arduino-ide.png)
+
+3. Click **Tools->Serial Port** and select the USB serial port to which your Arduino is connected to (the path changes with operating system and USB port you are using, so the name might be different for you).
+![Port](../img/arduino-port_choice.png)
+
+4. Then, select the right board: click **Tools->Board->Arduino Uno**.
+![Board](../img/arduino-board_choice.png)
+
+5. Then you can open the basic sketch "Blink" by clicking on **File->Example->01. Basics-> Blink**.
+![Sketch](../img/arduino-sketch_choice.png)
+
+6. You can then upload the sketch on the Arduino by clicking the "Upload" button (the one with an arrow).
+![Upload](../img/arduino-blink_upload.png)
+
+7. Once uploaded you will see the LED on pin 13 blink.
+![Blink](../img/arduino_blink-slow.gif)
+
+##### Alternative Hardware
+You might want to try to use an external LED. Here's the wiring diagram:
+![Arduino LED](../img/arduino-led_wiring.png)
+
+##### Understanding the "Blink" code
+```
+void setup() {
+  pinMode(LED_BUILTIN, OUTPUT);
+}
+
+void loop() {
+  digitalWrite(LED_BUILTIN, HIGH);   
+  delay(1000);                       
+  digitalWrite(LED_BUILTIN, LOW);    
+  delay(1000);                       
+}
+```
++ `pinMode(LED_BUILTIN, OUTPUT);` here we are initialising pin 13 as a output pin, note that instead of using a pin number we are using the LED_BUILTIN constant that stands for "pin 13"
++ `digitalWrite(LED_BUILTIN, HIGH);` here we are turning the LED on by setting the digital output as HIGH (HIGH is maximum voltage level, 5V)
++ `delay(1000);` here we are waiting for a second, note that the delay() function takes as a parameter milliseconds
++ `digitalWrite(LED_BUILTIN, LOW);` here we are turning the LED off by making the voltage LOW (0V)
++ `delay(1000);` here we are waiting for a second again
+
+We have setup general instructions in our setup, those instructions won't change when our sketch is running.
+We have inserted all the functions in the main loop so that they can be repeated infinitely.
+
+Try to tweak the delays to see how the timing differs.
+
+### Led PWM
+Here we will see how to do pulse-width modulation with the Arduino using a LED.
+
+##### Hardware
+![Wiring](../img/arduino-fade_wiring.png)
+
+##### Code
+For the code you can upload the built-in example "Fade" from **File->Example->01. Basics-> Fade**.
+![Fade Choice](../img/arduino-fade_choice.png)
+
+##### Understanding the "Fade" code
+```
+int led = 9;           
+int brightness = 0;    
+int fadeAmount = 5;    
+
+void setup() {
+  pinMode(led, OUTPUT);
+}
+
+void loop() {
+
+  analogWrite(led, brightness);
+  brightness = brightness + fadeAmount;
+
+  if (brightness <= 0 || brightness >= 255) {
+    fadeAmount = -fadeAmount;
+  }
+
+  delay(30);
+}
+```
+* `int led = 9;` here we are creating a variable of type int with name "led" and storing in it the pin number that our led is connected to, note that we are using pin number 9 which is one of the PWM-capable pins (marked by the ~ sign).
+* `int brightness = 0;` here we are creating a variable of type int with name "brightness" and assigning the initial value of 0
+* `int fadeAmount = 5;` here we are storing the amount we want the LED to fade for each interval in the "fadeAmount" variable
+* `pinMode(led, OUTPUT);` here we are declaring the led pin as an output note that this would be equivalent to this `pinMode(9, OUTPUT);`
+* `analogWrite(led, brightness);` here we are writing on pin 9 ("led") the brightness values
+* `brightness = brightness + fadeAmount;` here we are adding a fadeAmount to the brightness level
+* `if (brightness <= 0 || brightness >= 255) {
+    fadeAmount = -fadeAmount;
+  }` checks that the brightness level never takes invalid values (below 0 or above 255)
+* `delay(30);` a short delay to make the dimming effect more visible
+
+### Button
+Here we are going to see how Arduino receives signals from input devices using a button.
+
+##### Hardware
+![Wiring](../img/arduino-button_wiring.png)
+
+##### Code
+For the code you can copy and paste the following code:
+```
+int pushButton = 2;
+
+void setup() {
+  Serial.begin(9600);
+  pinMode(pushButton, INPUT);
+}
+
+
+void loop() {
+  int buttonState = digitalRead(pushButton);
+  Serial.println(buttonState);
+  delay(1);        
+}
+```
+* `Serial.begin(9600);` here we are opening the [serial communication](https://www.arduino.cc/en/Reference/Serial) with a baud rate of 9600 Bauds
+* `pinMode(pushButton, INPUT);` here we are setting the button's pin as input
+* `int buttonState = digitalRead(pushButton);` here we are reading the voltage of the button and memorising it in the variable buttonState
+* `Serial.println(buttonState);` here we are printing the values in the Serial Monitor
+* `delay(1);` a short delay to stabilise the readings
+
+To monitor what your Arduino is printing open the serial monitor by clicking on the serial monitor button:
+![Serial](../img/arduino-serial_monitor.png)
+
+### Combining everything
+As with the Raspberry Pi we challenge you to combine all three previous sketches to create one that with the press of the button controls 2 LEDs.
+
+[Here](https://www.arduino.cc/en/tutorial/pushbutton) you can find further help.
+
+##### Acknowledgement
+<small>Some material was taken from Arduino's [website](https://www.arduino.cc/).</small>
diff --git a/Chapter_4_Arduino+RPi/RPi_to_Arduino.md b/Chapter_4_Arduino+RPi/RPi_to_Arduino.md
new file mode 100644
index 0000000..7723eb9
--- /dev/null
+++ b/Chapter_4_Arduino+RPi/RPi_to_Arduino.md
@@ -0,0 +1,492 @@
+# Setting up Arduino for the Raspberry Pi
+
+In this tutorial we will see how to connect your Raspberry Pi to your Arduino. We will start by installing the Arduino IDE that you have already seen and then move to some command line tools. These tools don't need a graphical interface and you can use them without a monitor. The last section will give you some advices on how to install these tools on your laptop.
+
+You have to think of the Raspberry Pi as a computer that offers computational power and network capabilities, whereas Arduino communicates with sensors and actuators:
+![Rpi-Arduino](../img/rpi-arduino-scheme.png)
+
+1. [Arduino IDE](#arduino-ide)
+2. [Arduino Makefile](#arduino-makefile)
+3. [Arduino and Raspberry Pi Talking Over Serial](#arduino-and-raspberry-pi-talking-over-serial)
+4. [Suggested workflow](#suggested-workflow)
+5. [Other tools to make Arduino and Raspberry communicate](#other-tools-to-make-arduino-and-raspberry-communicate)
+6. [Command Line tools for your computer](#command-line-tools-for-your-computer)
+
+## Arduino IDE
+
+In this section we will se how to install the Arduino IDE from the command line of your RPi. This installation will be useful as it installs libraries that are used by the command line tools.
+
+
+### Installing Arduino on the Raspberry
+Note: This subsection takes you through to setup Arduino IDE using Raspberry Pi. It is not necessary if you are only using your computer to program the Arduino code, and using Raspberry Pi to upload the code to Arduino.
+
+From the terminal of your computer connected to the RPi via ssh type:
+```bash
+sudo apt-get install arduino
+```
+It is going to ask you to agree on using additional disk space, type Y and press Enter.
+
+Once we have done this installation we need to grant ourselves the permission to use the serial port. In order to do so we are going to add our user (pi) to the _tty_ and _dialout_ groups with two commands:
+```bash
+sudo usermod -a -G tty pi
+```
+```bash
+sudo usermod -a -G dialout pi
+```
+
+#### Working with the Arduino IDE
+
+If you now connect a keyboard, mouse and screen to your RPi, you can see that in the RPi menu under the "Electronics" section, Arduino IDE has been installed.  You can go ahead and use the Arduino IDE as you would on your laptop. The only difference is that the RPI is a slower to compile the new lines of code from the RPi with respect to a laptop.
+To test if Arduino IDE is working you can connect the Arduino to the RPi using one of the available USB ports like so:
+
+<img src="../img/connected-boards.png" alt="arduino" style="width: 400px;"/>
+
+Then run the Arduino IDE.
+
+<img src="../img/arduino-ide.png" alt="arduino" style="width: 400px;"/>
+
+At this point, the sketch window above will pop up, however if you are using a small screen such as the touchscreen peripheral from earlier tutorials, you may not be able to view the top of the window. To maximise the window, use the keyboard shortcut **Alt + Space** to get to the window management menu and then use the arrow keys and enter key to enter maximised window view.
+
+Click **Tools->Serial Port** and select the USB serial port to which your Arduino is connected (usually /dev/ttyACM0). Then, click **Tools->Board->Arduino Uno**. Then you can open the basic sketch "Blink" by clicking on **File->Example->01. Basics-> Blink**. You can then upload the sketch on the Arduino by clicking the "Upload" button (the one with an arrow).
+
+<img src="../img/arduino-blink.png" alt="arduino" style="width: 400px;"/>
+
+Once uploaded you will see the LED on pin 13 blink.
+
+**Note:** If /dev/ttyACM0 doesn't work, you can find out in which serial port your Arduino is plugged by unplugging it from the RPi. Then on the Rpi terminal type:
+
+```bash
+ls /dev/tty*
+```
+
+This command lists all the connected devices, it should show "/dev/ttyAMA0". Then plug in your Arduino again and enter the same command and you should find the right port popping up.
+
+<img src="../img/arduino-not-on-ttylist.png" alt="arduino" style="width: 400px;"/>
+
+<img src="../img/arduino-on-ttylist.png" alt="arduino" style="width: 400px;"/>
+
+## Arduino Makefile
+
+Now we are going to see how to write Arduino programs and compile and upload them to an Arduino from the command-line, avoiding the Arduino IDE. This will be very useful when we have finalized our electronics and we want to tweak some values without changing the whole I/O setup by rewiring the Arduino.
+
+First we are going to see how to do so using a [Makefile](https://en.wikipedia.org/wiki/Makefile) for Arduino with [arduino-mk](https://github.com/sudar/Arduino-Makefile) and then we are going to introduce another tool called ino.
+
+#### Installation
+
+1. First we are going to need to install the core Arduino development tools. We will need the ‘build-essential’ package that includes all the [GNU binutils](https://en.wikipedia.org/wiki/GNU_Binutils) including 'make' etc. so, from the terminal of your computer connected to the RPi, type:
+
+```bash
+sudo apt-get install build-essential
+```
+
+2. Now we can install these two packages:
+
+```bash
+sudo apt-get install arduino-core arduino-mk
+```
+
+* `arduino-core` provides all the Core Arduino libraries etc., and the Atmel AVR tool-chain (the libraries and tools designed for AVR microcontrollers, like Arduino).  
+* `arduino-mk` is a generic Makefile which conforms to the Gnu make syntax and which we can include into any Makefile we construct to build our code from the command line.
+
+#### Creating an Arduino Sketch without the IDE
+
+When we installed the Arduino IDE it created a directory called "sketchbook". This folder is made to store all your Arduino files tidily and to have them readily available for the IDE. We are going to use this folder even with our Makefile to maintain the compatibility with the IDE.
+
+**Note:** Each Arduino sketch has the extension .ino, these are the "source files", the instructions to be built into an executable program. These source files to be built correctly with the IDE need to be contained in a folder that has the same name as the sketch i.e. with a directory tree as follows:  
+> **/home/pi/sketchbook/**  
+> └── **blink/**  
+> └──── blink.ino  
+
+Using arduino-mk we are going to create a Makefile inside the source file directory; some other auxiliary files are going to be generated during the build process as we will see.
+
+For this example we are going to upload the same "blink" sketch we have seen before to test the functioning of our Makefile. This time we are going to create and manipulate the file from the command line.
+
+To set up our project we follow these steps:
+
+1. We are going to change the directory where we are and enter the sketchbook directory with this command (**NB** if the pi says there is no such directory, make one using the `mkdir sketchbook` command):
+```bash
+cd /home/pi/sketchbook
+```
+2. Then we make our directory and cd to it:
+```bash
+mkdir blink
+cd blink
+```
+3. Now we are going to create the .ino fie with nano and write our sketch, so we type:
+```bash
+nano blink.ino
+```
+4. Now we want to copy/paste these lines of code (feel free to tweak the delay values to play with the blinking time):
+
+```C
+#define LED_PIN 13
+
+void setup() {
+  pinMode(LED_PIN, OUTPUT);
+}
+
+void loop() {
+  digitalWrite(LED_PIN, HIGH);
+  delay(100); //100 millisecons ON
+  digitalWrite(LED_PIN, LOW);
+  delay(900); //100 millisecons OFF
+}
+```
+We save and exit.
+
+#### The Makefile
+Now we will write a Makefile in the same directory as our .ino sketch. With this file we can compile and ultimately upload the blink program we have just written.
+
+1. We are still in the same "blink" directory (/home/pi/sketchbook/blink), if you have changed it simply change back with `cd`. We create another file like we did before:
+
+```bash
+nano Makefile
+```
+
+> **/home/pi/sketchbook/**  
+> └── **blink/**  
+> └──── blink.ino  
+> └──── Makefile  
+
+2. Now we will write our Makefile. Here is the source of the Makefile that you can copy-paste:
+```
+ARDUINO_DIR  = /usr/share/arduino
+#ARDUINO_LIBS = Ethernet Ethernet/utility SPI
+BOARD_TAG    = uno
+ARDUINO_PORT = /dev/ttyACM0
+
+include /usr/share/arduino/Arduino.mk
+```
+* `ARDUINO_DIR` is the directory where by default our Arduino folder has been created when we installed the Arduino package.
+* `ARDUINO_LIBS` is the line that tells to the compiler which library are being used in the sketch. In "blink.ino" we are not using any library, that's why it has been commented out with the `#` character. If you are using any library in the future remember to include them and to remove the comment.
+* `BOARD_TAG` specify the kind of board we are using. We will always be using the Arduino Uno.
+* `ARDUINO_PORT` specify the USB Serial port to which our Arduino is connected.
+* `include ..` tells the compiler to include generic Makefile we have installed with `arduino-mk`.
+
+
+#### Building our Project
+Now we are going to build our sketch. This means that we are going to create an executable version of our Sketch. The Makefile tells the compiler how to assemble all the instruction blocks. Moreover the compiler will translate what we have written in the Arduino sketch (C/C++) into machine code. More information on how the Arduino IDE compiles the code can be found [here](https://github.com/arduino/Arduino/wiki/Build-Process).
+
+To build our file we simply enter:
+```bash
+sudo make
+```
+
+You will see a warning fly past about depends.mk not existing. This file will be created on the first compile.
+If this all works there will now be a sub-directory called ‘build-command line’, in which there are a whole bunch of files.
+
+> **/home/pi/sketchbook/**  
+> └── **blink/**  
+> └──── blink.ino  
+> └──── Makefile  
+> └──── **build-uno/**  
+> └────── blink.eep  
+> └────── blink.elf  
+> └────── blink.hex  
+> └────── blink.hex.sizeok  
+> └────── blink.ino.d  
+> └────── blink.ino.o  
+> └────── **core/**  
+> └────── libcore.a  
+
+These files are inside the *build-uno* folder so we change our directory:
+```bash
+cd build-uno
+```
+
+Then to see al the files, even the hidden ones we can enter the command `ls -a` or `ls -ld .?*`
+
+There are loads of files, including a lot which bear no resemblance to any source we have created. These are standard library files which have been compiled and which are linked into the result.
+
+The files which are crucial to us now are:
+
++ *blink.elf*
++ *blink.hex*
+
+**Note:** even if your source file was called differently from its containing directory, these two files will be named after the directory in which we are working. This will still work if you build your sketch with arduino-mk but not with the Arduino IDE.
+
+The .hex file is an ASCII file which contains a dump of the operation codes written into the .elf file.
+If you now use ```file blink.elf``` command to inspect blink.elf, you get this result:
+```bash
+blink1.elf: ELF 32-bit LSB executable, Atmel AVR 8-bit, version 1 (SYSV), statically linked, not stripped
+```
+As you can see, this is an Atmel 8-bit executable, not a Linux executable.
+The blink.hex file is ASCII but it is the values in this file which get written into the programmable chip on the Arduino board.
+
+#### Uploading our Project
+Now we are going to upload the compiled code to the Arduino. If you have unplugged it from your Raspberry, please connect it again with the provided USB cable.
+To upload the sketch simply type:
+```bash
+cd /home/pi/sketchbook/blink
+sudo make upload
+```
+
+> **Note:** We run the cd command to ensure we are in the correct directory to run the `make` command. Alternatively if you are in a child folder, you could run the command `cd ..` to go to the parent folder.
+
+We need to use `sudo` for `make` to get permission to communicate with to the serial device.
+
+Now your Arduino will start blinking!!
+
+**Note:** If it doesn't work you may have selected the wrong port. You can check to which port the Arduino is connected with the command ```ls /dev/ttyACM*``` or as we have illustrated before in the section to [**Working with the Arduino IDE**](#working-with-the-arduino-ide).
+
+What we have just done is ‘cross-compiled’ an executable. That is we have compiled some code on one platform, for running on another platform, or ‘flavour’ of processor.
+
+## Arduino and Raspberry Pi Talking Over Serial
+
+#### Arduino to Raspberry Pi
+To communicate between the Raspberry Pi and the Arduino over a serial connection, we’ll use the built-in Serial library on the Arduino side, and the Python pySerial module on the Raspberry Pi side.
+
+1. To install the serial module, run the following commands on your RPi terminal:
+```bash
+sudo apt-get install python-serial python3-serial
+```
+
+2. Now we want to **upload a new sketch on the Arduino**. You could upload it from your computer using the IDE, but we recommend using Arduino-mk as we did in the [previous exercise](#creating-an-arduino-sketch-without-the-ide). This means all the code can be written on the Pi via Putty or Terminal. The code is the following:
+```C
+void setup() {
+Serial.begin(9600);
+}
+
+void loop() {
+   for(byte n=0; n<255; n++){
+     Serial.write(n);
+     delay(50);
+   }
+}
+```
+This code counts upward and sends each number over the serial connection.
+Note that in Arduino, `Serial.write()` sends the actual number in the byte type, the actual 8-bit representation of the number.
+
+3. Now plug the Arduino to the USB of the Raspberry if you have unplugged it. Then in the RPi terminal let's open the Python shell by typing:
+```bash
+  python
+```
+This will launch the Python interpreter and the `>>>` prompt should appear.
+
+4. Now we type:
+```python
+from serial import Serial
+```
+If successful, when you press enter you should see no errors, and the cursor will return to the `>>>` prompt. Now we can use the class Serial to connect to our Arduino.
+
+5. We create a variable of type Serial that represents the serial connection with our Arduino:
+```python
+serialFromArduino = Serial('/dev/ttyACM0')
+```
+6. We can read one bit at a time what the Arduino has written over serial like this:
+```python
+input = serialFromArduino.read(1)
+```
+7. Then we print it in the console like this:
+```python
+print(ord(input))
+```  
+The function `ord`, given a string of length one, returns the value of the byte when the argument is an 8-bit string.
+You should see a *0* being printed.
+
+> **Note:** If you have problems with this step, make sure you have properly done step 2 (uploading the new sketch to Arduino).
+
+> **Note:** For the next step, you need to use **Ctrl+D** to exit the Python prompt.
+
+8. Now that we have tested that the connection works we want to write a Python script that reads the messages from serial.
+so we type:
+```bash
+cd home/pi/
+nano serialEcho.py
+```
+And we paste this code:
+```python
+import serial
+port = "/dev/ttyACM0"
+serialFromArduino = serial.Serial(port, 9600)
+serialFromArduino.flushInput()
+while True:
+ if (serialFromArduino.inWaiting() > 0):
+   input = serialFromArduino.read(1)
+   print(ord(input))
+```
+
+The meaning of each line is as follows:
+  * `import serial`: just like before we import the serial library
+  * `port = "/dev/ttyACM0"`: this time we save the port path in a variable
+  * `serialFromArduino = serial.Serial(port, 9600)`: we create an object of the class Serial, this time we specify the baud rate of our serial connection
+  * `serialFromArduino.flushInput()`: we clear out the input buffer
+  * `while True:`:we put the reading functions in a loop so we keep on reading the values written by the Arduino constantly
+  * `if (serialFromArduino.in_Waiting() > 0):`: we check that we are receiving bytes (i.e. that the input buffer is not empty)
+  * `input = serialFromArduino.read(1)`:w e read the content of the input buffer one byte at a time
+  * `print(ord(input))`: we interpret the incoming byte and we print it in the console
+
+The Arduino is sending a number to the Python script, which interprets that number as a string. The input variable will contain whatever character maps to that number in the ASCII table. To get a better idea, try replacing the last line of the Python script with this:
+```python
+print(str(ord(input)) + " = the ASCII character " + input + ".")
+```
+In Python to check if what you are getting is a string you can use the method explained [here](https://stackoverflow.com/questions/5319922/python-check-if-word-is-in-a-string).
+
+#### Raspberry Pi to Arduino
+
+To have the Raspberry Pi write and Arduino read (and turn on the built-in LED) you can use this code:
+
+1. On the Arduino side upload this code:
+```C
+const int ledPin = 13;
+
+void setup(){
+  pinMode(ledPin, OUTPUT);
+  Serial.begin(9600);
+}
+
+void loop(){
+
+  if (Serial.available()) {
+    light(Serial.read() – ‘0’);
+  }
+
+  delay(500);
+}
+
+void light(int n){
+  for (int i = 0; i < n; i++) {
+    digitalWrite(ledPin, HIGH);
+    delay(100);
+    digitalWrite(ledPin, LOW);
+    delay(100);
+  }
+}
+```
+
+2. On the Raspberry Pi run this code:
+```python
+import serial
+serialToArduino = serial.Serial('/dev/ttyACM0', 9600)
+serialToArduino.write('3')
+```
+
+## Suggested workflow
+We have prepared a schematic workflow chart to represent the suggested usage of the tools we have just introduced and how can these be tied together with the usage of Github.
+
+![workflow](../img/git-arduino-rpi-workflow.png "Workflow")
+
+## Other tools to make Arduino and Raspberry communicate
+Sometimes the communication over Serial is not the best option for your project or you might want to make your RPi and Arduino communicate in another way, or maybe communicate to other boards, so we have prepared a list of possible alternatives, but don't limit yourself to the ones listed. They are just brief introductions with links for a more in-depth knowledge. We leave this exploration to your curiosity!
+
+
+#### Protocols
+* [Serial over GPIO](https://oscarliang.com/raspberry-pi-and-arduino-connected-serial-gpio/) with this method you can use the same code we have used before, the only difference is the physical connection. You will need a voltage converter to operate this method safely. Otherwise there is an other risky option which is creating your own voltage divider, however we do not recommend you to do so.
+* [I2C](https://www.youtube.com/watch?v=DsSBTYbXAKg) is protocol that allows two devices to talk to each other using only two buses: a clock one (SCL bus) and a data on (SDA bus). It can allow up to 127 slaves connected to one master to exchange information. It is a very common protocol for Arduino as it is used to communicate with various sensors. There is a [dedicated library called Wire](https://www.arduino.cc/en/Reference/Wire) in Arduino that you can readily use.  
+* [SPI](http://radiostud.io/understanding-spi-in-raspberry-pi/) is a synchronous serial communication interface specification used for short distance communication, primarily in embedded systems. It uses four buses: clock (SCK), two data lines (MISO: Master Output Slave Input, MOSI: Master Input Slave Output) and a select line(SS) to choose among the multiple slave devices.
+
+#### Software
+* [Ino](#ino) is a command line tool that uses makefiles as well, is a simplified version of arduino-mk, but it has a big caveat which is that it modifies the directory structure, making it not compatible for the Arduino IDE.
+* [pyFirmata](https://pypi.python.org/pypi/pyFirmata) is Python interface for the Firmata procotol. It allows you to control an Arduino implementing the Firmata protocol with Python.
+* [Noduino](https://sbstjn.com/noduino/) is a JavaScript and Node.js framework for accessing basic Arduino controls from web pplications using HTML5, Socket.IO and Node.js.
+* [More examples here](http://www.pd-tutorial.com/english/index.html)
+
+## Ino
+
+Now we are going to see how to use ino, which is a tool written in Python. While it ultimately uses the same AVR tools that are used by the Arduino IDE, and by the Arduino-mk tool we used last time, it offers a different way of achieving the same results.
+Where ino wins over other command line tools is that it hides the messy bits of project authoring and building from the user. It has a major drawback which is that it imposes a specific directory tree as we will see. This makes it less compatible with the IDE.
+
+#### Installing ino
+
+To install ino we simply enter the command:
+```bash
+sudo pip install ino
+```
+### Using ino
+
+1. First of all we go to the sketchbook directory:
+```bash
+cd /home/pi/sketchbook
+```
+2. Once again we create a new directory for our project:
+```bash
+mkdir blink2
+cd blink2
+```
+3. This time we use ino to initialize the blink project from one of the ino examples:
+```bash
+ino init -t blink
+```
+
+This will create two sub-directories in our project directory:  
+> **/home/pi/sketchbook/**  
+> └── **blink2/**  
+> └──── **lib/**  
+> └──── **src/**  
+> └────── sketch.ino  
+
+In the src directory there is our source file, or ‘sketch’, called:
+sketch.ino
+
+4. We enter:
+```bash
+cd src
+cat sketch.ino
+```
+The terminal will show you the content of the file. As you can see it is exactly the same as the blink.ino source file we created for the blink project in the Arduino-mk section.
+ino has created this file automatically for us when we initialised the project with `ino init -t blink`.
+Feel free to tweak it with *nano* to change the blinking pattern.
+
+> **Note:** ino has two templates we can use: blink and empty. "empty" is a simple sketch with the setup and loop function already created. You can choose to initialise you sketch as empty by running `ino init -t blink` in a new folder.
+
+In the lib directory there is one file, called `.holder/`, which appears to be empty.
+We are not using any libraries other than the defaults in this sketch so there will be nothing in lib. If we were using libraries the files would automatically be added here.
+
+5. Now we change our directory back to the parent folder (this can be done with `cd ..` or `cd /home/pi/sketchbook/blink2/`) and then build the project:
+```bash
+ino build
+```
+
+This will create a directory called `.build/`.
+In `.build/` there are two things now:
+
+* environment.pickle
+* uno/
+
+The _.pickle_ file is a Python mechanism for taking a snap-shot of the build environment at build time.
+The directory uno, is where you will find similar files to the ones created before.
+Note that the uno directory is only called uno because it is an Arduino Uno for which we are developing, and because it is the default board type. If we chose to use a different Arduino version, this directory would be named the same way as the board type.
+
+Looking in the uno directory we see a bunch of files, which take the structure as follows:
+
+> **/home/pi/sketchbook/**  
+> └── **blink2/**  
+> └──── **lib/**  
+> └──── **src/**  
+> └────── sketch.ino  
+> └──── **.build/**  
+> └────── environment.pickle  
+> └────── **uno/**  
+> └──────── **arduino/**  
+> └──────── firmware.elf  
+> └──────── firmware.hex  
+> └──────── Makefile  
+> └──────── Makefile.deps  
+> └──────── Makefile.sketch  
+> └──────── **src/**  
+
+If you looked in arduino/, you would see files which should be familiar to you.
+Now in this directory, we also see:
+
+* firmware.elf
+* firmware.hex
+
+These two files correspond to the blink.elf and blink.hex files which were created by Arduino-mk last time.
+It is these files which are used in the upload.
+
+6. If you entered these folders go back to *blink2*. Then we issue this command to upload the sketch on our board:
+```bash
+sudo ino upload
+```
+Some of the messages that flew past will look familiar to you as they are the same of Arduino-mk.
+Now your sketch is uploaded and you should see your Arduino blinking again!
+
+
+## Command Line tools for your computer
+If you would like to use the same tools on your computer you can do so if you have either a Mac or Linux computer. This is because both Mac and Linux have Unix based operating systems. If you have a Linux computer you can follow exactly the same steps.
+
+If you have Mac special attention to the path of the USB port. It is going to look like this `/dev/tty.usbmodem411` to find your port name you can enter the command `ls /dev/tty.usb*`.
+Also on Mac there is no `apt-get` command. You have to install another package manager, the most common one which we also recommend using [Homebrew](https://brew.sh/) and to install any package use `brew install PACKAGE_NAME`
+
+_<small>Based on [Raspberry VI Tutorial](http://www.raspberryvi.org/stories/arduino-cli.html).
+</small>_
diff --git a/Chapter_5_Remote/Remote_Rpi - Backup.md b/Chapter_5_Remote/Remote_Rpi - Backup.md
new file mode 100644
index 0000000..1822a02
--- /dev/null
+++ b/Chapter_5_Remote/Remote_Rpi - Backup.md	
@@ -0,0 +1,123 @@
+# Remote connection to your Raspberry Pi
+
+**remot3.it** services allow you to connect easily and securely to your Pi from a mobile app, browser window and a terminal. It allows you to control remote computers (our RPi) using tcp hosts such as SSH. You will be able to connect to your RPi from laptop or desktop at home. The free remot3.it account allows for multiple registered services and 8 hours connections on up to 1 concurrent service(s).
+
+1. To configure weaved in our RPi, first we need to open an account on the [remot3.it](https://www.remot3.it/web/index.html) website. You can register from your laptop or desktop. You could also use the credentials of a weaved account, if you have one already.
+
+2. Once you have an account, from your RPi terminal we need to install weaved (which is the precursor on which remot3.it is based) to be able to connect our RPi. To install it:
+```bash
+sudo apt-get -y install weavedconnectd
+```
+3. Then we will open the weaved installer to link your RPi to your remot3.it account:
+```bash
+sudo weavedinstaller
+```
+4. Enter your remot3.it account username and password. Next, you will see this menu:
+
+<img src="../img/Pi-installer-menu.png" alt="menu1" style="width: 300px;"/>
+
+5. Then enter a name for your RPi (e.g. "myPI"). You can make it up, but remember to make a name easy for you to identify a specific RPi in case you have more than one attached to the weaved service:
+
+<img src="../img/remot3-piname.png" alt="menu0" style="width: 300px;"/>
+
+6. Initially you won’t have any Weaved services installed, so the upper part is empty.  Enter **1** to attach Weaved to an existing TCP service (host) on your Raspberry Pi.  You should now see the following screen:
+
+<img src="../img/Pi-installer-menu-02.png" alt="menu2" style="width: 300px;"/>
+
+7. Enter **1** for SSH.
+
+8. Next, we accept the default port (**y**).
+
+<img src="../img/Pi-installer-menu-03.png" alt="menu3" style="width: 300px;"/>
+
+9. The installer confirms your choice and asks you to give this connection a name:
+
+<img src="../img/Pi-installer-menu-04.png" alt="menu4" style="width: 300px;"/>
+
+10. You will now return to the main menu, where you can see your Weaved Service Connection installed, then enter **3** to exit.
+
+<img src="../img/Pi-installer-menu-051.png" alt="menu5" style="width: 300px;"/>
+
+Your RPi is now ready to run headless, we just have to connect with it over ssh on our laptop to control it from the terminal. We have created two access guide one for Linux and Mac Users and the other for Windows (please scroll further down for windows).
+
+## Accessing from your computer (Linux or Mac OS X)
+
+1. We will now see how to access using your laptop to your RPi from the terminal. First, if you login to your remot3.it account,  you will get a list of your devices:
+
+<img src="../img/remot3-logged_in.png" alt="remot31" style="width: 400px;"/>
+
+2. In your case you will have just one item. When you click on the name of you device, a pop-up will open:  
+
+<img src="../img/remot3-first_pop-up.png" alt="remot32" style="width: 400px;"/>
+
+Tips: You can also see the IP addresses of your devices directly from the dashboard. Within the same college network or if you have configured your raspberry pi to be accessible by public network, you can connect to your devices directly using the associated IP addresses. For more details and other tips, please visit this [link](https://github.com/ICL-DE/Gizmo/blob/master/SupplementaryMaterial/Advanced_remote_functionalities.md).
+
+3. Click on the name of your ssh service and then "Confirm".
+
+4. A second pop-up will appear:
+
+<img src="../img/remot3-third_pop-up.png" alt="remot33" style="width: 400px;"/>
+
+We copy the command after *For pi username*, in this example it is: ```ssh -l pi proxy54.yoics.net -p 30015```. For you it will be different.
+
+5. Then, paste the command in your laptop or desktop terminal (If you are using a Mac or Linux all will work, but for windows you have to [install a SSH and Telnet client](http://www.chiark.greenend.org.uk/~sgtatham/putty/)).
+
+6. The terminal is going to show you this message:
+
+<img src="../img/authenticity-check.png" alt="remot34" style="width: 400px;"/>
+
+Type yes.
+
+7. Then, you will be prompted to enter a password, you should enter the password of the root user of your RPi. If you didn't change it previously, by default is **raspberry**
+
+You will see on your laptop's terminal that now you are user pi. You are connected from your laptop to your RPi!! You don't need the display and mouse anymore!
+
+<small>To manage remote terminal sessions we suggest you use Screen, check out the tutorial [here](../SupplementaryMaterial/Screen.md).</small>
+
+To know more about more advance details of how connect remotely go to the [advanced guide](SupplementaryMaterial/Advanced_remote_functionalities.md).
+
+#### [Next Step](../Chapter_1/Python_warmup.md)
+
+## Accessing from your computer (Windows)
+
+If your computer operative  system is Windows, to access remotely you will need to install PuTTY, which  is a free implementation of SSH and Telnet for Windows and Unix platforms.
+
+1. To download it click [here]( http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html).
+
+<img src="../img/Putty.JPG" alt="weaved" style="width: 400px;"/>
+
+2. Once downloaded, proceed with the standard installation.
+
+3. Once installed double click on the **putty.exe** and you will see a window that looks like the one below:
+
+<img src="../img/PuttyConnect.JPG" alt="weaved" style="width: 400px;"/>
+
+4. Then, if you login to your remot3.it account,  you will get a list of the services linked to your devices:
+
+<img src="../img/remot3-logged_in.png" alt="weaved" style="width: 400px;"/>
+
+5. In your case you will have just one item. When you click on the name of you device, a pop-up will open:  
+
+<img src="../img/remot3-first_pop-up.png" alt="remot32" style="width: 400px;"/>
+
+6. Click on the name of your ssh service and then "Confirm".
+
+7. A second pop-up will appear:
+
+<img src="../img/remot3-third_pop-up.png" alt="remot33" style="width: 400px;"/>
+
+5. Insert the server address and port obtained from remot3.it into Putty and connect!
+
+Note for Windows Putty user: Rather than typing in "ssh -l pi <server> -p <port>", you just need to insert the server url and port from remot3.it.
+
+6. When asked for username and password, please use your RPi username and password to log-in. (Please note, this is not weaved username and password, The default password for RPi is "raspberry" and it is advisable to change this to something else).
+
+<img src="../img/pi_login_windows.PNG" alt="remot33" style="width: 400px;"/>
+
+To exit your putty session, type "exit" and enter.
+
+<small>To manage remote terminal sessions we suggest you use Screen, check out the tutorial [here](../SupplementaryMaterial/Screen.md).</small>
+
+To know more about more advance details of how connect remotely go to the [advanced guide](SupplementaryMaterial/Advanced_remote_functionalities.md).
+
+#### [Next Step](../Chapter_1/Python_warmup.md)
diff --git a/Chapter_5_Remote/Remote_Rpi.md b/Chapter_5_Remote/Remote_Rpi.md
new file mode 100644
index 0000000..792ea5f
--- /dev/null
+++ b/Chapter_5_Remote/Remote_Rpi.md
@@ -0,0 +1,121 @@
+# Remote connection to your Raspberry Pi
+
+**remot3.it** services allow you to connect easily and securely to your Pi from a mobile app, browser window and a terminal. It allows you to control remote computers (our RPi) using tcp hosts such as SSH. You will be able to connect to your RPi from laptop or desktop at home. The free remot3.it account allows for multiple registered services and 8 hours connections on up to 1 concurrent service(s).
+
+1. To configure weaved in our RPi, first we need to open an account on the [remot3.it](https://www.remot3.it/web/index.html) website. You can register from your laptop or desktop. You could also use the credentials of a weaved account, if you have one already.
+
+2. Once you have an account, from your RPi terminal we need to install weaved (which is the precursor on which remot3.it is based) to be able to connect our RPi. To install it:
+```bash
+sudo apt-get -y install weavedconnectd
+```
+3. Then we will open the weaved installer to link your RPi to your remot3.it account:
+```bash
+sudo weavedinstaller
+```
+4. Enter your remot3.it account username and password. Next, you will see this menu:
+
+<img src="../img/Pi-installer-menu.png" alt="menu1" style="width: 300px;"/>
+
+5. Then enter a name for your RPi (e.g. "myPI"). You can make it up, but remember to make a name easy for you to identify a specific RPi in case you have more than one attached to the weaved service:
+
+<img src="../img/remot3-piname.png" alt="menu0" style="width: 300px;"/>
+
+6. Initially you won’t have any Weaved services installed, so the upper part is empty.  Enter **1** to attach Weaved to an existing TCP service (host) on your Raspberry Pi.  You should now see the following screen:
+
+<img src="../img/Pi-installer-menu-02.png" alt="menu2" style="width: 300px;"/>
+
+7. Enter **1** for SSH.
+
+8. Next, we accept the default port (**y**).
+
+<img src="../img/Pi-installer-menu-03.png" alt="menu3" style="width: 300px;"/>
+
+9. The installer confirms your choice and asks you to give this connection a name:
+
+<img src="../img/Pi-installer-menu-04.png" alt="menu4" style="width: 300px;"/>
+
+10. You will now return to the main menu, where you can see your Weaved Service Connection installed, then enter **3** to exit.
+
+<img src="../img/Pi-installer-menu-051.png" alt="menu5" style="width: 300px;"/>
+
+Your RPi is now ready to run headless, we just have to connect with it over ssh on our laptop to control it from the terminal. We have created two access guide one for Linux and Mac Users and the other for Windows (please scroll further down for windows).
+
+## Accessing from your computer (Linux or Mac OS X)
+
+1. We will now see how to access using your laptop to your RPi from the terminal. First, if you login to your remot3.it account,  you will get a list of your devices:
+
+<img src="../img/remot3-logged_in.png" alt="remot31" style="width: 400px;"/>
+
+2. In your case you will have just one item. When you click on the name of you device, a pop-up will open:  
+
+<img src="../img/remot3-first_pop-up.png" alt="remot32" style="width: 400px;"/>
+
+3. Click on the name of your ssh service and then "Confirm".
+
+4. A second pop-up will appear:
+
+<img src="../img/remot3-third_pop-up.png" alt="remot33" style="width: 400px;"/>
+
+We copy the command after *For pi username*, in this example it is: ```ssh -l pi proxy54.yoics.net -p 30015```. For you it will be different.
+
+5. Then, paste the command in your laptop or desktop terminal (If you are using a Mac or Linux all will work, but for windows you have to [install a SSH and Telnet client](http://www.chiark.greenend.org.uk/~sgtatham/putty/)).
+
+6. The terminal is going to show you this message:
+
+<img src="../img/authenticity-check.png" alt="remot34" style="width: 400px;"/>
+
+Type yes.
+
+7. Then, you will be prompted to enter a password, you should enter the password of the root user of your RPi. If you didn't change it previously, by default is **raspberry**
+
+You will see on your laptop's terminal that now you are user pi. You are connected from your laptop to your RPi!! You don't need the display and mouse anymore!
+
+<small>To manage remote terminal sessions we suggest you use Screen, check out the tutorial [here](../SupplementaryMaterial/Screen.md).</small>
+
+To know more about more advance details of how connect remotely go to the [advanced guide](SupplementaryMaterial/Advanced_remote_functionalities.md).
+
+#### [Next Step](../Chapter_1/Python_warmup.md)
+
+## Accessing from your computer (Windows)
+
+If your computer operative  system is Windows, to access remotely you will need to install PuTTY, which  is a free implementation of SSH and Telnet for Windows and Unix platforms.
+
+1. To download it click [here]( http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html).
+
+<img src="../img/Putty.JPG" alt="weaved" style="width: 400px;"/>
+
+2. Once downloaded, proceed with the standard installation.
+
+3. Once installed double click on the **putty.exe** and you will see a window that looks like the one below:
+
+<img src="../img/PuttyConnect.JPG" alt="weaved" style="width: 400px;"/>
+
+4. Then, if you login to your remot3.it account,  you will get a list of the services linked to your devices:
+
+<img src="../img/remot3-logged_in.png" alt="weaved" style="width: 400px;"/>
+
+5. In your case you will have just one item. When you click on the name of you device, a pop-up will open:  
+
+<img src="../img/remot3-first_pop-up.png" alt="remot32" style="width: 400px;"/>
+
+6. Click on the name of your ssh service and then "Confirm".
+
+7. A second pop-up will appear:
+
+<img src="../img/remot3-third_pop-up.png" alt="remot33" style="width: 400px;"/>
+
+5. Insert the server address and port obtained from remot3.it into Putty and connect!
+
+Note for Windows Putty user: Rather than typing in "ssh -l pi <server> -p <port>", you just need to insert the server url and port from remot3.it.
+
+6. When asked for username and password, please use your RPi username and password to log-in. (Please note, this is not weaved username and password, The default password for RPi is "raspberry" and it is advisable to change this to something else).
+
+<img src="../img/pi_login_windows.PNG" alt="remot33" style="width: 400px;"/>
+
+To exit your putty session, type "exit" and enter.
+
+<small>To manage remote terminal sessions we suggest you use Screen, check out the tutorial [here](../SupplementaryMaterial/Screen.md).</small>
+
+To know more about more advance details of how connect remotely go to the [advanced guide](../SupplementaryMaterial/Advanced_remote_functionalities.md).
+
+#### [Next Step](../Chapter_1_Python/Python_warmup.md)
diff --git a/Chapter_6_Sensors/Sensors.md b/Chapter_6_Sensors/Sensors.md
new file mode 100644
index 0000000..d263083
--- /dev/null
+++ b/Chapter_6_Sensors/Sensors.md
@@ -0,0 +1,191 @@
+# Sensors
+
+In this section we are going to see how  to receive data from different sensors on the Arduino. The sensors we are going to use are:
+
+1. [Force Sensitive Resistor](#force-sensitive-resistor)
+2. [Light Sensor](#light-sensor)
+
+At the beginning of this session you should have collected a kit that is made of:
+* Arduino
+* 10kΩ Resistors
+* 1 Force Sensitive Resistor
+* 1 Photo-resistor
+
+#### Reading the sensor information
+
+For these exercises, there are two approaches to reading the sensor data.  
+**The easy approach:** You could use your computer (Windows/Mac) to run the Arduino IDE. For this approach you need to view your output from the Arduino with the Serial Monitor. Your sensor information will be output here when the `Serial.println()` / `Serial.print()` / `Serial.write()` function is used. This can be found with the image below:
+
+<p align="center"><img src="../img/serial_monitor_button.jpg" alt="Serial Monitor button Arduino IDE"></p>
+
+**The challenge:** Alternatively, if you are running the Arduino sketches from the headless (no screen) Raspberry Pi and controlling over Putty/Terminal then you could use the Python script to read the Serial port and print out to your command line on the Pi. Your sensor information will be output here when the `Serial.write()` function is used from the Arduino.
+
+### Force Sensitive Resistor
+
+The resistance of an force sensor varies as the force on the sensor increases or decreases. When no pressure is being applied to the force sensor, its resistance will be larger than 1MΩ. The harder you press on the sensor’s head, the lower the resistance between the two terminals drops. By combining the force sensor with a static resistor to create a [voltage divider](https://learn.sparkfun.com/tutorials/voltage-dividers)(or pull-down resistor), you can produce a variable voltage that can be read by a microcontroller’s analog-to-digital converter.
+
+##### Example Circuit
+![Force Resistor Wiring](../img/force-resistor-wiring.png)
+
+##### Code
+```C
+/* FSR simple testing sketch.
+
+Connect one end of FSR to power, the other end to Analog 0.
+Then connect one end of a 10K resistor from Analog 0 to ground
+
+For more information see www.ladyada.net/learn/sensors/fsr.html */
+
+int fsrPin = 0;     // the FSR and 10K pulldown are connected to a0
+int fsrReading;     // the analog reading from the FSR resistor divider
+
+void setup(void) {
+  // We'll send debugging information via the Serial monitor
+  Serial.begin(9600);   
+}
+
+void loop(void) {
+  fsrReading = analogRead(fsrPin);  
+
+  Serial.print("Analog reading = ");
+  Serial.print(fsrReading);     // the raw analog reading
+
+  // We'll have a few threshholds, qualitatively determined
+  if (fsrReading < 10) {
+    Serial.println(" - No pressure");
+  } else if (fsrReading < 200) {
+    Serial.println(" - Light touch");
+  } else if (fsrReading < 500) {
+    Serial.println(" - Light squeeze");
+  } else if (fsrReading < 800) {
+    Serial.println(" - Medium squeeze");
+  } else {
+    Serial.println(" - Big squeeze");
+  }
+  delay(1000);
+}
+```
+
+For other functionalities and more precise calibration make sure to check out [Adafruit's website](https://learn.adafruit.com/force-sensitive-resistor-fsr/using-an-fsr).
+
+### Light Sensor
+For the light sensing are going to use a photo-resistor or Cadmium-sulfide cell. CdS cells are little light sensors. As the squiggly face is exposed to more light, the resistance goes down. When its light, the resistance is about 5-10KΩ, when dark it goes up to 200KΩ.
+
+They are very low cost, easy to get in many sizes and specifications, but are very inaccurate. Each photocell sensor will act a little differently than the other, even if they are from the same batch. The variations can be really large, 50% or higher! For this reason, they shouldn't be used to try to determine precise light levels in lux or millicandela. Instead, you can expect to only be able to determine basic light changes.
+
+For most light-sensitive applications like "is it light or dark out", "is there something in front of the sensor (that would block light)", "is there something interrupting a laser beam" (break-beam sensors), or "which of multiple sensors has the most light hitting it", photocells can be a good choice!
+
+![Photocell](../img/light_photocell-diagram.png)
+
+##### Example Circuit
+To use, connect one side of the photo cell (either one, its symmetric) to power (for example 5V) and the other side to your microcontroller's analog input pin. Then connect a 10K pull-down resistor from that analog pin to ground. The voltage on the pin will be 2.5V or higher when its light out and near ground when its dark.
+
+![Photocell wiring](../img/light-wiring.png)
+
+##### Code
+In the Arduino IDE you will find under *File → Examples → 10.StarterKit_BasicKit → p04ColorMixingLamp* an example sketch that uses three photo-resistors to control three LEDs to create a colour-changing lamp. We challenge you to tweak the code to fit your needs and to read the value from one photo-resistor.
+
+Color Mixing Lamp Code
+```C
+/*
+  Arduino Starter Kit example
+ Project 4  - Color Mixing Lamp
+
+ This sketch is written to accompany Project 3 in the
+ Arduino Starter Kit
+
+ Parts required:
+ 1 RGB LED
+ three 10 kilohm resistors
+ 3 220 ohm resistors
+ 3 photoresistors
+ red green and blue colored gels
+
+ Created 13 September 2012
+ Modified 14 November 2012
+ by Scott Fitzgerald
+ Thanks to Federico Vanzati for improvements
+
+ http://www.arduino.cc/starterKit
+
+ This example code is part of the public domain
+ */
+
+const int greenLEDPin = 9;    // LED connected to digital pin 9
+const int redLEDPin = 10;     // LED connected to digital pin 10
+const int blueLEDPin = 11;    // LED connected to digital pin 11
+
+const int redSensorPin = A0;  // pin with the photoresistor with the red gel
+const int greenSensorPin = A1;   // pin with the photoresistor with the green gel
+const int blueSensorPin = A2;   // pin with the photoresistor with the blue gel
+
+int redValue = 0; // value to write to the red LED
+int greenValue = 0; // value to write to the green LED
+int blueValue = 0; // value to write to the blue LED
+
+int redSensorValue = 0; // variable to hold the value from the red sensor
+int greenSensorValue = 0; // variable to hold the value from the green sensor
+int blueSensorValue = 0; // variable to hold the value from the blue sensor
+
+void setup() {
+  // initialize serial communications at 9600 bps:
+  Serial.begin(9600);
+
+  // set the digital pins as outputs
+  pinMode(greenLEDPin, OUTPUT);
+  pinMode(redLEDPin, OUTPUT);
+  pinMode(blueLEDPin, OUTPUT);
+}
+
+void loop() {
+  // Read the sensors first:
+
+  // read the value from the red-filtered photoresistor:
+  redSensorValue = analogRead(redSensorPin);
+  // give the ADC a moment to settle
+  delay(5);
+  // read the value from the green-filtered photoresistor:
+  greenSensorValue = analogRead(greenSensorPin);
+  // give the ADC a moment to settle
+  delay(5);
+  // read the value from the blue-filtered photoresistor:
+  blueSensorValue = analogRead(blueSensorPin);
+
+  // print out the values to the serial monitor
+  Serial.print("raw sensor Values \t red: ");
+  Serial.print(redSensorValue);
+  Serial.print("\t green: ");
+  Serial.print(greenSensorValue);
+  Serial.print("\t Blue: ");
+  Serial.println(blueSensorValue);
+
+  /*
+  In order to use the values from the sensor for the LED,
+  you need to do some math. The ADC provides a 10-bit number,
+  but analogWrite() uses 8 bits. You'll want to divide your
+  sensor readings by 4 to keep them in range of the output.
+  */
+
+  redValue = redSensorValue / 4;
+  greenValue = greenSensorValue / 4;
+  blueValue = blueSensorValue / 4;
+
+  //  print out the mapped values
+  Serial.print("Mapped sensor Values \t red: ");
+  Serial.print(redValue);
+  Serial.print("\t green: ");
+  Serial.print(greenValue);
+  Serial.print("\t Blue: ");
+  Serial.println(blueValue);
+
+  /*
+  Now that you have a usable value, it's time to PWM the LED.
+  */
+  analogWrite(redLEDPin, redValue);
+  analogWrite(greenLEDPin, greenValue);
+  analogWrite(blueLEDPin, blueValue);
+}
+```
+
+### Acknowledgement
+<small>Based on [this](https://learn.adafruit.com/photocells/using-a-photocell) Adafruit guide and Adafruit's [Photocell's page](https://www.adafruit.com/product/161).</small>
diff --git a/Chapter_7_Actuators/Actuators.md b/Chapter_7_Actuators/Actuators.md
new file mode 100644
index 0000000..a98bdac
--- /dev/null
+++ b/Chapter_7_Actuators/Actuators.md
@@ -0,0 +1,281 @@
+# Actuators
+
+In this section we are going to learn about actuators and how to control them .
+
+1. [Piezo Buzzer](#piezo-buzzer)
+2. [Servo Motor](#servo-motor)
+3. [About the Adafruit TB6612 Driver](#about-the-adafruit-tb6612-driver)
+4. [DC Motor](#dc-motor)
+5. [Stepper Motor](#stepper-motor)
+
+
+At the beginning of this session you should have collected a kit that is made of:
+* [Buzzer](http://uk.rs-online.com/web/p/piezo-buzzer-components/0457011/)
+* [Servo Motor](https://www.rapidonline.com/feetech-fs90-mini-servo-120-9g-37-1339)
+* [Adafruit TB6612 Driver](https://learn.adafruit.com/adafruit-tb6612-h-bridge-dc-stepper-motor-driver-breakout/overview)
+* [DC Motor](https://www.adafruit.com/product/711)
+* [Stepper Motor](https://www.adafruit.com/product/324)
+
+### Piezo Buzzer
+A [piezoelectric speaker](https://www.wikiwand.com/en/Piezoelectric_speaker) (sometimes colloquially called a "piezo") or buzzer is a loudspeaker that uses the piezoelectric effect for generating sound. The initial mechanical motion is created by applying a voltage to a piezoelectric material, and this motion is typically converted into audible sound using diaphragms and resonators.
+![Piezo Bending](../img/piezo-bending.png)
+<small>When fixed to a metallic diaphragm and excited with an alternating voltage, the diameter of the disc varies by a small amount, this causes dishing of the diaphragm which gives a much louder sound.</small>
+
+##### Example Circuit
+From the kit you are going to need:
+* Buzzer
+* Jumper Wires
+* Arduino
+
+![Buzzer Wiring](../img/piezo-buzzer-wiring.png)
+
+##### Code
+For the code you can use the **Example → 2.Digital → toneMelody**. Feel free to play around with it.
+
+Pi Route: You can also try to control this buzzer from your Raspberry Pi [here](http://gpiozero.readthedocs.io/en/stable/api_output.html?highlight=servo#buzzer) you can find the GPIOzero API Reference.
+
+### Servo Motor
+A [servo motor](https://www.wikiwand.com/en/Servomotor#/RC_servos) is a rotary actuator or linear actuator that allows for precise control of angular or linear position, velocity and acceleration. It consists of a suitable motor coupled to a sensor for position feedback. It also requires a relatively sophisticated controller, often a dedicated module designed specifically for use with servomotors.
+
+##### Example Circuit
+From the kit you are going to need:
+* Servo Motor
+* Jumper Wires
+* Arduino
+
+![Servo Wiring](../img/servo-sweep-wiring.png)
+
+##### Code
+For this example you are going to use the built-in [servo library](https://www.arduino.cc/en/Reference/Servo) by Arduino and we are going to use the built-in sketch **Example → Servo → Sweep**
+![Servo Sketch](../img/arduino-servo_choice.png)
+
+```C
+/* Sweep
+ by BARRAGAN <http://barraganstudio.com>
+ This example code is in the public domain.
+
+ modified 8 Nov 2013
+ by Scott Fitzgerald
+ http://www.arduino.cc/en/Tutorial/Sweep
+*/
+
+#include <Servo.h>
+
+Servo myservo;  // create servo object to control a servo
+// twelve servo objects can be created on most boards
+
+int pos = 0;    // variable to store the servo position
+
+void setup() {
+  myservo.attach(9);  // attaches the servo on pin 9 to the servo object
+}
+
+void loop() {
+  for (pos = 0; pos <= 180; pos += 1) { // goes from 0 degrees to 180 degrees
+    // in steps of 1 degree
+    myservo.write(pos);              // tell servo to go to position in variable 'pos'
+    delay(15);                       // waits 15ms for the servo to reach the position
+  }
+  for (pos = 180; pos >= 0; pos -= 1) { // goes from 180 degrees to 0 degrees
+    myservo.write(pos);              // tell servo to go to position in variable 'pos'
+    delay(15);                       // waits 15ms for the servo to reach the position
+  }
+}
+
+```
+
+Pi Route: You can also try to control this servo motor from your Raspberry Pi [here](http://gpiozero.readthedocs.io/en/stable/api_output.html?highlight=servo) you can find the GPIOzero API Reference.
+
+### About the Adafruit TB6612 Driver
+A motor driver is a little current amplifier; the function of motor drivers is to take a low-current control signal and then turn it into a higher-current signal that can drive a motor.
+
+The [Adafruit TB6612 Driver](https://learn.adafruit.com/adafruit-tb6612-h-bridge-dc-stepper-motor-driver-breakout/pinouts) contains two full H-bridges (four half H-bridges). That means you can drive four solenoids, two DC motors bi-directionally, or one stepper motor. Just make sure they're good for 1.2 Amp or less of current, since that's the limit of this chip.
+It comes with built in kick-back diodes internally so you don't have to worry about the inductive kick damaging your project or driver.
+
+There's two digital inputs per H-bridge (one for each half of the bridge) as well as a PWM input per driver so you can control motor speed. Runs at 2.7V-5V logic. The motor voltage is separate from the logic voltage. Good for motor voltages from 4.5V up to 13.5V! This wont work well for 3V motors.
+
+##### Pinouts
+
+**Power Pins**
+* Vmotor - This is the voltage for the motors, not for the logic level. Keep this voltage between 4.5V and 13.5V. This power supply will get noisy so if you have a system with analog readings or RF other noise-sensitive parts, you may need to keep the power supplies separate (or filtered!)
+* Vcc - this is the voltage for the logic levels. Set to the voltage logic you'll be using on your micro-controller. E.g. for Arduinos, 5V is probably what you want. Can be 2.7V to 5.5V so good for 3V or 5V logic
+* GND - This is the shared logic and motor ground. All grounds are connected
+
+**Signal in Pins**
+These are all 'Vcc logic level' inputs
+* INA1, INA2 - these are the two inputs to the Motor A H-bridges
+* PWMA - this is the PWM input for the Motor A H-bridges, if you dont need PWM control, connect this to logic high.
+* INB1, INB2 - these are the two inputs to the Motor B H-bridges
+* PWMB - this is the PWM input for the Motor B H-bridges, if you dont need PWM control, connect this to logic high.
+* STBY - this is the standby pin for quickly disabling both motors, pulled up to Vcc thru a 10K resistor. Connect to ground to disable.
+
+**Motor Out Pins**
+These are 'Vmotor level' power outputs
+* Motor A - these are the two outputs for motor A, controlled by INA1, INA2 and PWMA
+* Motor B - these are the two outputs for motor B, controlled by INB1, INB2 and PWMB
+
+<small>Based on [Adafruit's Pinouts](https://learn.adafruit.com/adafruit-tb6612-h-bridge-dc-stepper-motor-driver-breakout/pinouts)</small>
+
+### Dc Motor
+
+### DC Motor
+A [DC motor](https://www.wikiwand.com/en/DC_motor) is any of a class of rotary electrical machines that converts direct current electrical energy into mechanical energy. The most common types rely on the forces produced by magnetic fields. Nearly all types of DC motors have some internal mechanism, either electromechanical or electronic, to periodically change the direction of current flow in part of the motor.
+
+##### Example Circuit
+* Stepper Motor
+* Adafruit TB6612 Driver
+* Jumper Wires
+* Arduino
+
+![DC Wiring](../img/arduino-dc_wiring.JPG)
+
++ AIN1 to pin 8
++ AIN2 to pin 9
++ PWMA to 5V
++ GND to Arduino GND
++ Vcc to 5V
++ Vm to 5V
++ motorA to DC motor
+
+
+##### Code
+For this sketch copy and paste the following code:
+
+```C
+
+int ain1 = 8;
+int ain2 = 9;
+
+void setup(){
+  pinMode(ain1,OUTPUT);  //Logic pins are also set as output
+  pinMode(ain2,OUTPUT);
+  Serial.begin(9600);
+}
+
+void loop(){
+
+  /*CLOCKWISE MOTION:
+     + ain1 = HIGH
+     + ain2 = LOW
+  */
+  digitalWrite(ain1,HIGH);
+  digitalWrite(ain2,LOW);
+
+  Serial.println("Clockwise");
+
+  //Clockwise for 3 secs
+  delay(3000);     
+
+  /*STOPPING:
+     + ain1 = HIGH
+     + ain2 = LOW
+  */
+  digitalWrite(ain1,HIGH);
+  digitalWrite(ain2,HIGH);
+
+  Serial.println("Braking");
+
+  delay(1000);
+
+  /*STOPPING:
+     + ain1 = LOW
+     + ain2 = HIGH
+  */
+  digitalWrite(ain1,LOW);
+  digitalWrite(ain2,HIGH);
+
+  Serial.println("Anti-Clockwise");
+
+  delay(3000);
+
+  //TO PAUSE THE MOTOR
+  digitalWrite(ain1,HIGH);
+  digitalWrite(ain2,HIGH);
+
+  Serial.println("On Pause");
+
+  delay(1000);
+ }
+```
+
+You can also try to control this DC motor from your Raspberry Pi [here](https://gpiozero.readthedocs.io/en/stable/api_output.html#motor) you can find the GPIOzero API Reference.
+
+### Stepper Motor
+A [stepper motor](https://www.wikiwand.com/en/Stepper_motor) or step motor or stepping motor is a brushless DC electric motor that divides a full rotation into a number of equal steps. The motor's position can then be commanded to move and hold at one of these steps without any position sensor for feedback (an open-loop controller), as long as the motor is carefully sized to the application in respect to torque and speed.
+
+##### Example Circuit
+From the kit you are going to need:
+* Stepper Motor
+* Adafruit TB6612 Driver
+* Crocodile Clips
+* Jumper Wires
+* Arduino
+
+![Stepper Wiring](../img/arduino-stepper_wiring.JPG)
+
++ AIN1 to pin 8
++ AIN2 to pin 9
++ PWMA to 5V
++ BIN1 to pin 10
++ BIN2 to pin 11
++ PWMB to 5V
++ GND to Arduino GND
++ Vcc to 5V
++ Vm to 5V
++ motorA to Stepper motor
++ motorB to Stepper motor
+
+##### Code
+For this example you are going to use the built-in [stepper library](https://www.arduino.cc/en/Reference/Stepper) by Arduino and we are going to use the built-in sketch **Example → Stepper → stepper_oneRevolution**
+
+![Stepper Selection](../img/arduino-stepper_choice.png )
+
+```C
+/*
+ Stepper Motor Control - one revolution
+
+ This program drives a unipolar or bipolar stepper motor.
+ The motor is attached to digital pins 8 - 11 of the Arduino.
+
+ The motor should revolve one revolution in one direction, then
+ one revolution in the other direction.
+
+
+ Created 11 Mar. 2007
+ Modified 30 Nov. 2009
+ by Tom Igoe
+
+ */
+
+#include <Stepper.h>
+
+const int stepsPerRevolution = 200;  // change this to fit the number of steps per revolution
+// for your motor
+
+// initialize the stepper library on pins 8 through 11:
+Stepper myStepper(stepsPerRevolution, 8, 9, 10, 11);
+
+void setup() {
+  // set the speed at 60 rpm:
+  myStepper.setSpeed(60);
+  // initialize the serial port:
+  Serial.begin(9600);
+}
+
+void loop() {
+  // step one revolution  in one direction:
+  Serial.println("clockwise");
+  myStepper.step(stepsPerRevolution);
+  delay(500);
+
+  // step one revolution in the other direction:
+  Serial.println("counterclockwise");
+  myStepper.step(-stepsPerRevolution);
+  delay(500);
+}
+
+```
+
+### Acknowledgement
+[Adafruit Learn](https://learn.adafruit.com/)  
+[Wikiwand Piezoelectric Speaker](https://www.wikiwand.com/en/Piezoelectric_speaker)
diff --git a/Week1/Bash_script/Cheat_sheat_bash_Linux.md b/Introductory_Material/Cheat_sheet_bash_Linux.md
similarity index 85%
rename from Week1/Bash_script/Cheat_sheat_bash_Linux.md
rename to Introductory_Material/Cheat_sheet_bash_Linux.md
index 0817a1f..3e1ed82 100644
--- a/Week1/Bash_script/Cheat_sheat_bash_Linux.md
+++ b/Introductory_Material/Cheat_sheet_bash_Linux.md
@@ -11,7 +11,7 @@ To escape from the manual, just type: *q*
 ### File Commands
 
 <p align="center">
-<img src="File_commands.png" alt="File commands" width="400">
+<img src="../img/File_commands.png" alt="File commands" width="400">
 </p>
 
 **Examples - working with directories:**
@@ -52,37 +52,37 @@ To exit press: **ctrl + d"**.
 ### Directory
 
 <p align="center">
-<img src="Directory_access.png" alt="Directory Access" width="400">
+<img src="../img/Directory_access.png" alt="Directory Access" width="400">
 </p>
 
 ### Disk usage
 
 <p align="center">
-<img src="Disk_usage.png" alt="Disk_usage" width="400">
+<img src="../img/Disk_usage.png" alt="Disk_usage" width="400">
 </p>
 
 ### File transfer and Remote Access
 
 <p align="center">
-<img src="Remote_access.png" alt="Remote_access" width="400">
+<img src="../img/Remote_access.png" alt="Remote_access" width="400">
 </p>
 
 ### Search
 
 <p align="center">
-<img src="Search.png" alt="Search" width="400">
+<img src="../img/Search.png" alt="Search" width="400">
 </p>
 
 ### System
 
 <p align="center">
-<img src="System.png" alt="System" width="400">
+<img src="../img/System.png" alt="System" width="400">
 </p>
 
 ### Process Related
 
 <p align="center">
-<img src="Process_related.png" alt="Process_related" width="400">
+<img src="../img/Process_related.png" alt="Process_related" width="400">
 </p>
 
 ### Virtual terminal (Screen)
diff --git a/Introductory_Material/Cheat_sheet_bash_Linux.pdf b/Introductory_Material/Cheat_sheet_bash_Linux.pdf
new file mode 100644
index 0000000..b35fabc
Binary files /dev/null and b/Introductory_Material/Cheat_sheet_bash_Linux.pdf differ
diff --git a/README.md b/README.md
index 586ee8f..2174fa3 100644
--- a/README.md
+++ b/README.md
@@ -1,27 +1,71 @@
 ## Programming material for Gizmo workshop
 
-All the students (GD1 and DE2) will have access to the programming material shown in the workshop.
+All the students will have access to the programming material shown in the workshop.
 
-To copy the repo in your computer just execute the following command line in the terminal ( you must be in the path where you want to save the folder in your computer):
+To copy the repo in your computer just execute the following command line in the terminal:
 
 ``` bash
-$cd /name/of/folder
-$git clone https://github.com/Starignus/PythonPractise.git
+$cd /path/to/folder
+$git clone https://github.com/ICL-DE/Gizmo.git
 ```
 
-#### Direct links to access guides from the browser:
+#### Introductory Material
 
-##### Week 1:
+* [Linux (Bash) commands cheat sheet](Introductory_Material/Cheat_sheet_bash_Linux.md)
+* [Introduction to Github](SupplementaryMaterial/Links.md/#git-related)
 
-* [Week 1 Program in PDF.](Week1/Week1_Programme.pdf)
-* [Raspberry Pi set up](Week1/RPIsetup/RPI_setup.md)
-  * [Advance remote access notes.](Week1/RPIsetup/Advance_remoteconection.md)
-* [Linux (Bash) commands cheat sheet.](Week1/Bash_script/Cheat_sheat_bash_Linux.md)
+#### Chapter 1: Basic Electronics and Programming
 
-##### Week 2:
-* [Remote Access in practise](Week1/RPIsetup/Advance_remoteconection.md)
-* [Warming up in Python](Week1/Python/Python_week1.md)
-* [GPIO-Part 1](Week2/GPIO_Part1.md)
-* [GPIO-Part 2: Motor HAT](Week2/GPIO_Part2_MotorHAT.md)
+* Basic electronics
+* [Warming up in Python](Chapter_1_Python/Python_warmup.md)
 
-You can read all these practice in the [blog](https://starignus.github.io/PythonPractise//) too.
+
+#### Chapter 2: Raspberry Pi
+
+* [Raspberry Pi set up](Chapter_2_RPi/RPi_setup.md)
+* [RPi GPIOzero](Chapter_2_RPi/RPi_GPIO.md)
+
+#### Chapter 3: Arduino
+
+* [Intro to Arduino](Chapter_3_Arduino/Arduino_intro.md)
+* [Warming up in Arduino](Chapter_3_Arduino/Arduino_warmup.md)
+
+#### Chapter 4: Arduino + Raspberry Pi Combo!
+
+* [RPi & Arduino](Chapter_4_Arduino+RPi/RPi_to_Arduino.md)
+
+#### Chapter 5: Remote Connection to Raspberry Pi
+
+* [Remote connection to your Raspberry Pi](Chapter_5_Remote/Remote_Rpi.md)
+
+#### Chapter 6: Sensors
+
+* [Sensors (Digital, ADC, LEDs, etc)](../Chapter_6_Sensors/Sensors.md)
+
+#### Chapter 7: Making things move
+
+* [Actuators (Motor Driver, ADC, etc)](../Chapter_7_Actuators/Actuators.md)
+
+
+#### Supplementary Material
+
+* [Alternative Network's Settings](SupplementaryMaterial/Alternative_network_settings.md)
+* [Advanced remote functionalities](SupplementaryMaterial/Advanced_remote_functionalities.md)
+* [Backing up your Raspberry Pi](SupplementaryMaterial/Backing_up_RPi.md)
+* [RPi GPIO: Motor HAT](SupplementaryMaterial/RPi_GPIO_MotorHat.md)
+* [Screen Cheatsheet](SupplementaryMaterial/Screen_cheatsheet.md)
+* [Github Cheatsheet](SupplementaryMaterial/git-cheat-sheet-education.pdf)
+* [Markdown Cheatsheet](SupplementaryMaterial/Markdown_cheatsheet.md)
+* [Links](SupplementaryMaterial/Links.md)
+* [Raspberry Pi or Arduino?](SupplementaryMaterial/RPi_or_Arduino.md)
+
+
+#### Acknowledgement and Credits
+
+* Dr. Ariadna Blanca Romero
+* Dr. Jing Sheng Pang
+* Elena Falomo
+* Benedict Greenberg
+* Sparkfun Learn
+* Raspberry Pi Foundation
+* Raspberry Pi GPIO developers
diff --git a/Week1/RPIsetup/Advance_remoteconection.md b/SupplementaryMaterial/Advanced_remote_functionalities.md
similarity index 68%
rename from Week1/RPIsetup/Advance_remoteconection.md
rename to SupplementaryMaterial/Advanced_remote_functionalities.md
index b1b0ee6..0235789 100644
--- a/Week1/RPIsetup/Advance_remoteconection.md
+++ b/SupplementaryMaterial/Advanced_remote_functionalities.md
@@ -1,37 +1,48 @@
-# Remote connection to your Raspberry Pi
+# Advanced Remote Functionalities
 
-### Checking your IP address from the terminal
+1. [Alternative ways to connect to your Raspberry Pi remotely](#alternative-ways-to-connect-to-your-raspberry-pi-remotely)
+2. [Transferring files](#transferring-files)
+3. [Managing Users on your Raspberry Pi](#managing-users-on-your-raspberry-pi)
+4. [Suggested Workflow for Optional Upgrades](#suggested-workflow-for-optional-upgrades)
 
-We can use a command to check the different internet connections available on our system: _ifconfig_ or _ifconfig -a_.
-```bash
-$ ifconfig
-```
-This command allows to know the IP addresses assigned to our RPi. The _wlan0_, indicates the status of the WiFi, and _eth0_ shows the status of the Ethernet (wired) connection). In the next screen shoot shows an example of a RPi connected to the internet using the ethernet port. The red oval shows where to find the IP address assigned to the RPi.
 
-<img src="ifconfig.png" alt="ifconfig" style="width: 400px;"/>
+## Alternative ways to connect to your Raspberry Pi remotely
+
+We already know how to connect through remot3.it service, but we know that the connection lasts 8 hours and it allows us to work on one terminal session at a time. Therefore, with the help of remot3.it and another commands we can connect to or RPi for longer and using multiple terminals. In this section we are going to connect to our RPi using its IP address.
+
+If you do not know what is an IP address, please go to the [this link](https://www.youtube.com/watch?v=7_-qWlvQQtY) for a quick explanation. The IPs can be dynamic or static, but what is the difference? When a device is assigned a static IP address, the address does not change. Most devices use dynamic IP addresses, which are assigned by the network when they connect and change over time (which is the case for our RPi on the Imperial-WPA).
 
-If you do not know what is an **IP address**, please go to the next [link](https://www.youtube.com/watch?v=7_-qWlvQQtY) for a quick explanation. The IPs can be dynamic or static, but what is the difference? When a device is assigned a static IP address, the address does not change. Most devices use dynamic IP addresses, which are assigned by the network when they connect and change over time.
+#### Checking your IP address from remot3.it
+remot3.it displays the external IP of the devices you have registered. You can get your RPi's one in the *External IP* Tab:
 
-### Why do I need to know my IP address?
-We already know how to connect through weaved service, but we know the connection last just 30 minutes and lets just to work on a terminal session at the time. Therefore, with the help of weave and another command we can connect to or RPi for longer and using multiple terminals.
+<img src="../img/remot3-it-ip.png" alt="weaved" style="width: 400px;"/>
 
-* First connect as usual to your weaved account and then connect to your RPi using the terminal of your laptop of desktop as you already did when you [set up weaved](RPI_setup.md).
-* Then, you need to know the IP address assigned to your RPi:
-*
+**Note:** If you are connected with your laptop to the same network of your RPi the internal and external IP addresses will be the same like in the example above.
+
+#### Checking your IP address from the terminal
+
+We can use a command to check the different internet connections available on our system: _ifconfig_ or _ifconfig -a_.
 ```bash
 $ ifconfig
 ```
+This command allows to know the IP addresses assigned to our RPi. The _wlan0_, indicates the status of the WiFi, and _eth0_ shows the status of the Ethernet (wired) connection). In the next screen shoot shows an example of a RPi connected to the internet using the ethernet port. The red oval shows where to find the IP address assigned to the RPi for the Ethernet connection.
+
+<img src="../img/ifconfig.png" alt="ifconfig" style="width: 400px;"/>
+
+You can find your IP address for the WiFi connection in the corresponding _wlan0_ inet addr field.
+
+#### Connecting via ssh knowing your IP
 
-Once you know the IP (e.g. your IP is 192.31.123.122), you can access using other terminal to the RPi as:
+Once you know the IP (e.g. your IP is 192.31.123.122), you can access using your laptop terminal to the RPi as:
 
 ```bash
 $ ssh pi@192.31.123.122
 ```
 Remember that the **root username** is **pi**, the syntax for the ssh command is: ```ssh username@IP``` or ```ssh username@machine_name```.
 
-**Note:** Since at Imperial network the IPs are dynamic, the IP is constantly changing, so could be that the IP changes in a day or hours (could be sometimes longer) and you need to repeat the procedure using weaved.
+**Note:** Since at Imperial network the IPs are dynamic, the IP is constantly changing, so could be that the IP changes in a day or hours (could be sometimes longer) and you need to repeat the last steps on your laptop of the remot3.it setup procedure.
 
-### Copying files from my laptop to my RPi
+## Transferring files
 
 #### Using terminal
 
@@ -68,13 +79,13 @@ Instead a terminal, we can use to transfer files using a software that mounts an
 
 * [Cyberduck](https://cyberduck.io/?l=en)
 
-<img src="cyberduck.png" alt="weaved" style="width: 400px;"/>
+<img src="../img/cyberduck.png" alt="weaved" style="width: 400px;"/>
 
 * For just Windows you can use: [WinSCP](https://winscp.net/eng/index.php)
 
-<img src="WinSCPPortable.png" alt="weaved" style="width: 400px;"/>
+<img src="../img/WinSCPPortable.png" alt="weaved" style="width: 400px;"/>
 
-## Creating and deleting a new user
+## Managing Users on your Raspberry Pi
 
 You can create additional users on your Raspbian installation with the ```adduser``` command.
 
@@ -92,7 +103,7 @@ sudo userdel -r bob
 
 The default ```pi``` user on Raspbian is a sudoer. This gives the ability to run commands as root when preceded by ```sudo```, and to switch to the root user with ```sudo su```.
 
-## Optional
+## Suggested Workflow for Optional Upgrades
 
 The next command is for updating and upgrading the Linux packages in the operative system, but it won't be executed during the workshop since it can take a while. It is always good to keep the system up to date.
 
diff --git a/SupplementaryMaterial/Alternative_network_settings.md b/SupplementaryMaterial/Alternative_network_settings.md
new file mode 100644
index 0000000..21920f6
--- /dev/null
+++ b/SupplementaryMaterial/Alternative_network_settings.md
@@ -0,0 +1,136 @@
+# Alternative Network Setting
+
+If you don't have access to a guest account for the Imperial-WPA network or you would like to connect your Raspberry Pi  to any eduroam network, we have prepared a step by step guide to help you.
+
+  + [Imperial WPA](#step-1:-setting-the-wifi-from-imperial-college-network-with-your-credentials)
+  + [eduroam](#alternative-step-1:-setting-wifi-from-eduroam-network)
+
+**Note:** In this guide you will have to type your password in clear and then encrypt it. If you are working with your teammates, especially, be careful. However we have provided an option that involves typing the password only once.
+
+### Step 1: Setting the WiFi from Imperial College network with your credentials
+
+1. To set up the WiFi we need to modify a configuration file. First we back up the configuration file *wpa_supplicant.conf*, to do so we enter the command:
+
+```bash
+$ sudo cp /etc/wpa_supplicant/wpa_supplicant.conf /etc/wpa_supplicant/wpa_supplicant.conf_backup
+```
+
+2. Then we edit the *wpa_supplicant.conf*. The default text editor installed in the RPi is _nano_. To edit a file with the nano editor is sufficient to enter the command ```nano /path/to/file```. Therefore to edit *wpa_supplicant.conf* we enter the following command with admin user permission:
+```bash
+$ sudo nano /etc/wpa_supplicant/wpa_supplicant.conf
+```
+
+This file should just have the next line at the beginning:
+```bash
+ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
+update_config=1
+```
+
+3. Then we add to the content of *wpa_supplicant.conf* the lines after # IC (**the configuration is case sensitive, so make sure you do not have typos**):
+
+```bash
+ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
+update_config=1
+
+
+# IC
+network={
+        ssid="Imperial-WPA"
+        proto=RSN
+        key_mgmt=WPA-EAP
+        pairwise=CCMP
+        auth_alg=OPEN
+        eap=PEAP
+        identity="ic\COLLEGE_USERNAME"
+        password="YOUR_PASSWORD"
+}
+```
+**Note:** This is the Imperial College configuration if you want to connect to the eduroam network follow the Alternative Guide
+
+4. Now we have to replace "COLLEGE_USERNAME" with a valid college username and "YOUR_PASSWORD" with the account's password. If you are not comfortable in writing your password in plain text while working with your team, leave the field blank and follow the steps in Section 2 to encrypt your password before setting it up in the *wpa_supplicant.conf*.
+
+5. (Optional) If you have replaced your password in the previous step you can check if the connection works by rebooting your RPi. One the system starts again the RPi should connect automatically to the WiFi.
+
+### Alternative Step 1: Setting WiFi from eduroam network
+
+To connect to the eduroam network we will need to execute steps 1 and 2 of the previous section on how to modify the settings for the Imperial College network. Then in step 3 the informations we need to enter are slightly different:
+
+```bash
+ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
+update_config=1
+
+
+# eduroam
+network={
+        ssid="eduroam"
+        proto=RSN
+        key_mgmt=WPA-EAP
+        pairwise=CCMP
+        auth_alg=OPEN
+        eap=PEAP
+        identity="COLLEGE_USERNAME@ic.ac.uk"
+        password="YOUR_PASSWORD"
+}
+```
+
+**Note:** If you want your RPi to be able to connect to different networks you can include multiple network={⋯} entries.
+
+4. You will have to replace "COLLEGE_USERNAME" with a valid username. You can change "@ic.ac.uk" with any domain that has accredited access to the eduroam network (e.g "@network.rca.ac.uk"). Replace "YOUR_PASSWORD" with the password related to that account. If you are not comfortable in writing your password in plain text while working with your team, leave the field blank and follow step 3 to encrypt your password before setting it up in the *wpa_supplicant.conf*.
+
+5. (Optional) If you have replaced your password in the previous step you can check if the connection works by rebooting your RPi. One the system starts again the RPi should connect automatically to the WiFi.
+
+### Step 2: Encrypting Your Password
+
+1. In order not to store the password in a plain text we substitute our password with an **encrypted** one using  a **MD4 hash generator**. You can generate the hash with the following Linux command:
+
+```bash
+$ echo -n 'YOUR_PASSWORD' | iconv -t utf16le | openssl md4
+```
+
+You will have to substitute 'YOUR_PASSWORD' with the password related to the account in the *wpa_supplicant.conf*. This will be the only time you'll have to type it in plain text. Ask your teammates to look away from the screen if you are not comfortable in them seeing your password.
+
+2. The previous command will display the encrypted password on your terminal like this:
+```bash
+$ (stdin)= a6c71eedc2eacbca84003336a4a62a1c
+```
+We copy the string that was generated in your terminal screen (i.e. 'a6c71eedc2eacbca84003336a4a62a1c' in the example).
+
+**Note:** Also you can save the hash from your password in a file and then read its content:
+```bash
+$ echo -n 'YOUR_PASSWORD' | iconv -t utf16le | openssl md4 > hash.txt
+$ cat hash.txt
+```
+The first command creates the encrypted password and stores it in the __hash.txt__ file.
+The second command reads the content of the __hash.txt__ file.
+In general we use the ```cat``` command to read and concatenate files.
+
+3. Then we open again the *wpa_supplicant.conf* with:
+
+```bash
+$ sudo nano /etc/wpa_supplicant/wpa_supplicant.conf
+```
+4. In the password field replace "YOUR_PASSWORD" with the string you generated as hexadecimal characters, adding the 'hash:' prefix as shown in the example bellow:
+
+```bash
+# IC
+network={
+        ssid="Imperial-WPA"
+        proto=RSN
+        key_mgmt=WPA-EAP
+        pairwise=CCMP
+        auth_alg=OPEN
+        eap=PEAP
+        identity="ic\COLLEGE_USERNAME"
+        password=hash:a6c71eedc2eacbca84003336a4a62a1c
+}
+```
+5. The last security step to perform is to remove the bash history (the one that stores all the commands we had typed on the terminal). Therefore, we enter the following commands:
+```bash
+$ history -w
+$ history -c
+```
+6. Then we reboot the RPi to check that the password was properly set up with:
+```bash
+$ reboot
+```
+7. And you are done!
diff --git a/SupplementaryMaterial/Backing_up_RPi.md b/SupplementaryMaterial/Backing_up_RPi.md
new file mode 100644
index 0000000..d3ed731
--- /dev/null
+++ b/SupplementaryMaterial/Backing_up_RPi.md
@@ -0,0 +1,39 @@
+# Backup RPi Image
+
+It is useful and advisable to backup a working copy of your RPi image. For example, make a backup copy after setting up WiFi. The next time the WiFi is not working, you can reformat the SD card and reinsert this backup copy to revert back to previous version. After this, your RPi will connect to the WiFi right away like before. Here are the steps:
+
+## Backing up your image:
+
+##### For Windows
+
+1. Download Win 32 Disk Imager if none installed on your computer [here]( https://sourceforge.net/projects/win32diskimager/)
+2. Insert the SDCard into your computer (e.g. via card reader or SD card slot if your computer has one).
+3. Open Win 32 Disk Imager. Select a location and give a file name for the backup image.
+4. Select the right drive.
+5. Click Read.
+6. Once done, keep this backup copy safe. Please note that the size of the backup is the same size of your SD Card. SO please be mindful that it will take a considerable amount of disk space.
+
+##### For Mac
+1. Open DiskUtility
+2. Select "APPLE SD Card Reader Media"
+3. Click on *File -> New File -> Image from "Untitled"*
+4. Leave the choose "CD/DVD" and "no encryption"
+5. Insert your password when asked
+6. You're done!
+
+## Replacing the image on the SD Card
+
+##### For Windows
+
+1. Download SDFormatter if none installed [here](https://www.sdcard.org/downloads/formatter_4/).
+2. Download Win 32 Disk Imager if none installed [here](https://sourceforge.net/projects/win32diskimager/) or Etcher For Mac [here](https://www.etcher.io).
+3. Use SDFormatter to format the SD card. Please be careful and make sure you select the correct drive letter.
+4. Use Win 32 Disk Imager or Etcher to re-image the backed up image into the SD card. I.e. select the file name, the drive letter of the SD card, and then click Write. Please be careful that the correct drive letter is selected. If you wish to install a fresh Raspbian OS, you can download it [here](www.raspberrypi.org).
+5. Once this is done, a new image has been rewritten on your SD Card!
+
+##### For Mac
+
+1. Download Etcher [here](https://etcher.io/)
+2. Open Etcher
+3. Choose the image that you want to burn on the SD card. **Note:** if you backed up the image with the method above you might have to change the file extension from ".cdr" to ".iso"
+4. Flash it and you're done!
diff --git a/SupplementaryMaterial/Links.md b/SupplementaryMaterial/Links.md
new file mode 100644
index 0000000..8a6452e
--- /dev/null
+++ b/SupplementaryMaterial/Links.md
@@ -0,0 +1,64 @@
+# Links
+
+Here is a list of useful links for external resources. Please feel free to make additional suggestions!
+
+## Editors Related
+
+|Title| Links   |
+|---|---|
+| Pycharm | https://www.jetbrains.com/pycharm/  |
+| Atom  | https://atom.io/  |
+| Sublime  | www.sublimetext.com  |
+| Notepad++  | https://notepad-plus-plus.org/  |
+
+## FTP/SFTP related
+
+|Title| Links   |
+|---|---|
+| WinSCP | https://winscp.net/eng/download.php  |
+| Cyberduck  | https://cyberduck.io/?l=en  |
+| MobaXTerm  | mobaxterm.mobatek.net  |
+
+## SSH
+
+|Title| Links   |
+|---|---|
+| Putty for Windows | http://www.putty.org/  |
+| MobaXTerm  | https://cyberduck.io/?l=en  |
+
+
+## Git related
+
+|Title| Links   |
+|---|---|
+| Setting up a Github Account @ IC | http://www.imperial.ac.uk/admin-services/ict/self-service/research-support/research-support-systems/github/working-with-githubcom/ |
+| GitHub Basic Course | https://services.github.com/on-demand/  |
+| Try Git  | https://try.github.io/levels/1/challenges/1  |
+| Collaboration Workflow (Short) | https://code.tutsplus.com/tutorials/how-to-collaborate-on-github--net-34267  |
+| Collaboration Workflow (Comprehensive) | https://www.atlassian.com/git/tutorials/comparing-workflows  |
+| Github for Desktop | https://desktop.github.com/  |
+| Github Student Developer Pack | https://education.github.com/pack |
+
+
+## Raspberry Pi
+
+|Title| Links   |
+|---|---|
+| RaspberryPi | https://raspberrypi.org  |
+| Adafruit Learn  | https://learn.adafruit.com/  |
+| Make: | https://makezine.com/ |
+
+
+## 3D Objects Library
+
+|Title| Links   |
+|---|---|
+| Thingiverse | https://www.thingiverse.com/  |
+| MyMiniFactory  | https://www.myminifactory.com/ |
+
+
+### Specific for Imperial College Students
+
+|Title| Links   |
+|---|---|
+| Getting GitHub Enterprise | https://www.imperial.ac.uk/admin-services/ict/self-service/research-support/research-support-systems/github/  |
diff --git a/SupplementaryMaterial/Markdown_cheatsheet.md b/SupplementaryMaterial/Markdown_cheatsheet.md
new file mode 100644
index 0000000..90099b4
--- /dev/null
+++ b/SupplementaryMaterial/Markdown_cheatsheet.md
@@ -0,0 +1,360 @@
+# Markdown Cheatsheet
+
+Markdown is a text-to-HTML conversion tool for web writers. Markdown allows you to write using an easy-to-read, easy-to-write plain text format, then convert it to structurally valid XHTML (or HTML).
+So our text can be converted into a formatted text with the use of ASCII-only punctuation marks and other non-letter symbols for tags.
+For a complete reference to the Markdown Project you can refer to [its creator's website](https://daringfireball.net/projects/markdown/syntax).
+**Note:** Github uses Github Flavoured Markdown, which is a variation of the original Markdown language. It adds some functionalities, that we have grouped under "Github Flavoured Markdown"
+
+### Headers
+
+```
+# H1
+## H2
+### H3
+#### H4
+##### H5
+###### H6
+```
+Alternatively, for H1 and H2, an underline-ish style:
+```
+Alt-H1
+======
+
+Alt-H2
+------
+```
+
+# H1
+## H2
+### H3
+#### H4
+##### H5
+###### H6
+
+Alternatively, for H1 and H2, an underline-ish style:
+
+Alt-H1
+======
+
+Alt-H2
+------
+
+### Emphasis
+
+Emphasis, aka italics, with `*asterisks*` or `_underscores_`.
+
+Strong emphasis, aka bold, with two `**asterisks**` or `__underscores__`.
+
+Combined emphasis with `**asterisks and _underscores_**`.
+
+Strikethrough uses two tildes. `~~Scratch this.~~`
+
+Emphasis, aka italics, with *asterisks* or _underscores_.
+
+Strong emphasis, aka bold, with **asterisks** or __underscores__.
+
+Combined emphasis with **asterisks and _underscores_**.
+
+Strikethrough uses two tildes. ~~Scratch this.~~
+
+### Lists
+
+```
+(In this example, leading and trailing spaces are shown with with dots: ⋅)
+
+1. First ordered list item
+2. Another item
+⋅⋅* Unordered sub-list.
+1. Actual numbers don't matter, just that it's a number
+⋅⋅1. Ordered sub-list
+4. And another item.
+
+⋅⋅⋅You can have properly indented paragraphs within list items. Notice the blank line above, and the leading spaces (at least one, but we'll use three here to also align the raw Markdown).
+
+⋅⋅⋅To have a line break without a paragraph, you will need to use two trailing spaces.⋅⋅
+⋅⋅⋅Note that this line is separate, but within the same paragraph.⋅⋅
+⋅⋅⋅(This is contrary to the typical GFM line break behaviour, where trailing spaces are not required.)
+
+* Unordered list can use asterisks
+- Or minuses
++ Or pluses
+```
+
+1. First ordered list item
+2. Another item
+  * Unordered sub-list.
+1. Actual numbers don't matter, just that it's a number
+  1. Ordered sub-list
+4. And another item.
+
+   You can have properly indented paragraphs within list items. Notice the blank line above, and the leading spaces (at least one, but we'll use three here to also align the raw Markdown).
+
+   To have a line break without a paragraph, you will need to use two trailing spaces.  
+    Note that this line is separate, but within the same paragraph.
+     (This is contrary to the typical GFM line break behaviour, where trailing spaces are not required.)
+
+* Unordered list can use asterisks
+- Or minuses
++ Or pluses
+
+### Links
+
+There are two ways to create links.
+```
+[I'm an inline-style link](https://www.google.com)
+
+[I'm an inline-style link with title](https://www.google.com "Google's Homepage")
+
+[I'm a reference-style link][Arbitrary case-insensitive reference text]
+
+[I'm a relative reference to a repository file](../blob/master/LICENSE)
+
+[You can use numbers for reference-style link definitions][1]
+
+Or leave it empty and use the [link text itself].
+
+URLs and URLs in angle brackets will automatically get turned into links.
+http://www.example.com or <http://www.example.com> and sometimes
+example.com (but not on Github, for example).
+```
+
+There are two ways to create links.
+
+[I'm an inline-style link](https://www.google.com)
+
+[I'm an inline-style link with title](https://www.google.com "Google's Homepage")
+
+[I'm a reference-style link][Arbitrary case-insensitive reference text]
+
+[I'm a relative reference to a repository file](../blob/master/LICENSE)
+
+[You can use numbers for reference-style link definitions][1]
+
+Or leave it empty and use the [link text itself].
+
+URLs and URLs in angle brackets will automatically get turned into links.
+http://www.example.com or <http://www.example.com> and sometimes
+example.com (but not on Github, for example).
+
+### Images
+
+Here's Github mark (hover to see the title text):
+```
+![alt text](https://octodex.github.com/images/yaktocat.png "Logo Title Text 1")
+```
+
+![alt text](https://octodex.github.com/images/yaktocat.png "Logo Title Text 1")
+
+### YouTube Videos
+
+They can't be added directly but you can add an image with a link to the video like this using HTML tags:
+```
+<a href="http://www.youtube.com/watch?feature=player_embedded&v=YOUTUBE_VIDEO_ID_HERE
+" target="_blank" ><img src="http://img.youtube.com/vi/YOUTUBE_VIDEO_ID_HERE/0.jpg"
+alt="IMAGE ALT TEXT HERE" width="240" height="180" border="10"/></a>
+```
+<a href="http://www.youtube.com/watch?feature=player_embedded&v=YOUTUBE_VIDEO_ID_HERE
+" target="blank" ><img src="http://img.youtube.com/vi/YOUTUBE_VIDEO_ID_HERE/0.jpg"
+alt="IMAGE ALT TEXT HERE" width="240" height="180" border="10"/></a>  
+
+Or, in pure Markdown, but losing the alt image sizing and border:  
+
+[![IMAGE ALT TEXT HERE](http://img.youtube.com/vi/YOUTUBE_VIDEO_ID_HERE/0.jpg)](http://www.youtube.com/watch?v=YOUTUBE_VIDEO_ID_HERE)  
+
+### Blockquotes
+
+```
+> Blockquotes are very handy in email to emulate reply text.
+> This line is part of the same quote.
+
+Quote break.
+
+> This is a very long line that will still be quoted properly when it wraps. Oh boy let's keep writing to make sure this is long enough to actually wrap for everyone. Oh, you can *put* **Markdown** into a blockquote.
+Blockquotes are very handy in email to emulate reply text. This line is part of the same quote.
+Quote break.
+```
+
+> Blockquotes are very handy in email to emulate reply text.
+> This line is part of the same quote.
+
+Quote break.
+
+> This is a very long line that will still be quoted properly when it wraps. Oh boy let's keep writing to make sure this is long enough to actually wrap for everyone. Oh, you can *put* **Markdown** into a blockquote.
+Blockquotes are very handy in email to emulate reply text. This line is part of the same quote.
+Quote break.
+
+### Inline HTML
+
+You can also use raw HTML in your Markdown, and it'll mostly work pretty well. It is especially useful for paragraph formatting.
+
+```
+<dl>
+  <dt>Definition list</dt>
+  <dd>Is something people use sometimes.</dd>
+
+  <dt>Markdown in HTML</dt>
+  <dd>Does *not* work **very** well. Use HTML <em>tags</em> for <b>formatting</b>.</dd>
+</dl>
+```
+<dl>
+  <dt>Definition list</dt>
+  <dd>Is something people use sometimes.</dd>
+
+  <dt>Markdown in HTML</dt>
+  <dd>Does *not* work **very** well. Use HTML <em>tags</em> for <b>formatting</b>.</dd>
+</dl>
+
+### Horizontal Rule
+
+Three or more...
+
+\-\-\-
+
+Hyphens
+
+\*\*\*
+
+Asterisks
+
+\_\_\_
+
+Underscores
+
+Three or more...
+
+---
+
+Hyphens
+
+***
+
+Asterisks
+
+___
+
+Underscores
+
+### Backlash to escape
+Markdown allows you to use backslash escapes to generate literal characters which
+would otherwise have special meaning in Markdown’s formaing syntax.
+```
+\*literal asterisks\*
+```
+
+\*literal asterisks\*
+
+# Github Flavoured Markdown
+
+The following features are not entirely part of the Markdown specs, but renderers (like Github) support these additional features. Some of them are especially useful when it come to version control.
+
+### Code and Syntax Highlighting
+
+Code blocks are part of the Markdown spec, but syntax highlighting is Github specific.
+
+Inline \`code\` has \`back-ticks around\` it.
+Inline `code` has `back-ticks around` it.
+
+Blocks of code are either fenced by lines with three back-ticks \`\`\`, or are indented with four spaces. I recommend only using the fenced code blocks -- they're easier and only they support syntax highlighting.
+
+\`\`\`  
+   javascript  
+   var s = "JavaScript syntax highlighting";  
+   alert(s);  
+\`\`\`  
+
+\`\`\`  
+   python  
+   s = "Python syntax highlighting"  
+   print s  
+\`\`\`  
+
+\`\`\`  
+   No language indicated, so no syntax highlighting in Markdown Here (varies on Github).  
+   But let's throw in a <b>tag</b>.  
+\`\`\`  
+
+```javascript
+var s = "JavaScript syntax highlighting";
+alert(s);
+```
+```python
+s = "Python syntax highlighting"
+print s
+```
+```
+No language indicated, so no syntax highlighting in Markdown Here (varies on Github).
+But let's throw in a <b>tag</b>.
+```
+
+### Tables
+
+Tables aren't part of the core Markdown spec, but they are part of Github Flavoured Markdown. They are an easy way of adding tables to your email -- a task that would otherwise require copy-pasting from another application.
+
+Colons can be used to align columns.
+<pre><span>
+
+| Tables        | Are           | Cool  |  
+| ------------- |:-------------:| -----:|  
+| col 3 is      | right-aligned | $1600 |  
+| col 2 is      | centered      |   $12 |  
+| zebra stripes | are neat      |    $1 |  
+
+</span></pre>
+
+| Tables        | Are           | Cool  |
+| ------------- |:-------------:| -----:|
+| col 3 is      | right-aligned | $1600 |
+| col 2 is      | centered      |   $12 |
+| zebra stripes | are neat      |    $1 |
+
+There must be at least 3 dashes separating each header cell.
+The outer pipes (|) are optional, and you don't need to make the
+raw Markdown line up prettily. You can also use inline Markdown.
+
+<pre><span>
+Markdown | Less | Pretty
+--- | --- | ---
+*Still* | `renders` | **nicely**
+1 | 2 | 3
+</pre></span>
+
+Markdown | Less | Pretty
+--- | --- | ---
+*Still* | `renders` | **nicely**
+1 | 2 | 3
+
+### Task Lists
+```
+- [x] @mentions, #refs, [links](), **formatting**, and <del>tags</del> supported
+- [x] list syntax required (any unordered or ordered list supported)
+- [x] this is a complete item
+- [ ] this is an incomplete item
+```
+- [x] @mentions, #refs, [links](), **formatting**, and <del>tags</del> supported
+- [x] list syntax required (any unordered or ordered list supported)
+- [x] this is a complete item
+- [ ] this is an incomplete item
+If you include a task list in the first comment of an Issue, you will get a handy progress indicator in your issue list. It also works in Pull Requests!
+
+### Issue references within a repository
+
+Any number that refers to an Issue or Pull Request will be automatically converted into a link.
+```
+#1
+mojombo#1
+mojombo/github-flavored-markdown#1
+```
+
+### Username @mentions
+
+Typing an @ symbol, followed by a username, will notify that person to come and view the comment. This is called an “@mention”, because you’re mentioning the individual. You can also @mention teams within an organization.
+
+
+### Emoji
+
+GitHub supports emoji! :sparkles: :camel: :boom:
+
+To see a list of every image we support, check out the [Emoji Cheat Sheet](https://www.webpagefx.com/tools/emoji-cheat-sheet/).
+
+
+<small>Based on Adam's Pritchard's [Markdown Cheatsheet](https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet) and Github's [Mastering Markdown](https://guides.github.com/features/mastering-markdown/)</small>
diff --git a/Week2/GPIO_Part2_MotorHAT.md b/SupplementaryMaterial/RPi_GPIO_MotorHat.md
similarity index 92%
rename from Week2/GPIO_Part2_MotorHAT.md
rename to SupplementaryMaterial/RPi_GPIO_MotorHat.md
index f03c6d2..03e8c3a 100644
--- a/Week2/GPIO_Part2_MotorHAT.md
+++ b/SupplementaryMaterial/RPi_GPIO_MotorHat.md
@@ -20,11 +20,11 @@
  **The Motor HAT** comes with an assembled and tested HAT, terminal blocks, and 2x20 plain header. Some soldering is required to assemble the headers on. Here we leave a link with a [step-by-step](https://learn.adafruit.com/adafruit-dc-and-stepper-motor-hat-for-raspberry-pi/assembly) guide of how to solder the headers and a video to show you [tips on soldering](
  https://www.youtube.com/watch?v=QKbJxytERvg).
 
- <img src="raspberry_pi_2348_top_ORIG.jpg" alt="rpi" style="width: 400px;"/>
+ <img src="../img/raspberry_pi_2348_top_ORIG.jpg" alt="rpi" style="width: 400px;"/>
 
 Once the motor HAT is assembled, we place it on top so that the short pins of the 2x20 header line up with the pads on the HAT.
 
- <img src="raspberry_pi_place.jpg" alt="rpi-hat" style="width: 400px;"/>
+ <img src="../img/raspberry_pi_place.jpg" alt="rpi-hat" style="width: 400px;"/>
 
 ## Powering Motors
 
@@ -42,13 +42,13 @@ The motor driver chips that come with the kit are designed to provide up to **1.
 
 Therefore, you can use a 9V 1A, 12V 1A, or 12V 5A DC regulated switching power adapter. In case you want to make it portable, you can use a big Lead Acid or multiple-AA NiMH battery pack of 4 to 8 batteries to vary the voltage from about 6V to 12V as your motors require.
 
-<img src="raspberry_pi_powerplug.jpg" alt="hat-power" style="width: 400px;"/>
+<img src="../img/raspberry_pi_powerplug.jpg" alt="hat-power" style="width: 400px;"/>
 
 ## Connecting DC Motors
 
 To connect a motor, simply solder two wires to the terminals and then connect them to either the **M1, M2, M3**, or **M4**. If your motor is running 'backwards' from the way you like, just swap the wires in the terminal block. For this demo, please connect it to **M3**.
 
-<img src="raspberry_pi_dcmotor.jpg" alt="hat-power" style="width: 400px;"/>
+<img src="../img/raspberry_pi_dcmotor.jpg" alt="hat-power" style="width: 400px;"/>
 
 ## Installing Software
 
@@ -75,15 +75,15 @@ sudo raspi-config
 
  and follow the prompts to install I2C support for the ARM core and linux kernel:
 
- <img src="I2C_1.png" alt="I2C_1" style="width: 400px;"/>
+ <img src="../img/I2C_1.png" alt="I2C_1" style="width: 400px;"/>
 
- <img src="I2C_2.png" alt="I2C_2" style="width: 400px;"/>
+ <img src="../img/I2C_2.png" alt="I2C_2" style="width: 400px;"/>
 
- <img src="I2C_3.png" alt="I2C_3" style="width: 400px;"/>
+ <img src="../img/I2C_3.png" alt="I2C_3" style="width: 400px;"/>
 
- <img src="I2C_4.png" alt="I2C_4" style="width: 400px;"/>
+ <img src="../img/I2C_4.png" alt="I2C_4" style="width: 400px;"/>
 
- <img src="I2C_5.png" alt="I2C_5" style="width: 400px;"/>
+ <img src="../img/I2C_5.png" alt="I2C_5" style="width: 400px;"/>
 
 __Then reboot!__
 
diff --git a/SupplementaryMaterial/RPi_or_Arduino.md b/SupplementaryMaterial/RPi_or_Arduino.md
new file mode 100644
index 0000000..7e62145
--- /dev/null
+++ b/SupplementaryMaterial/RPi_or_Arduino.md
@@ -0,0 +1,35 @@
+# Alternatives/Comparison between Arudino and Raspberry PI
+
+### Why Arduino?
+
+RPi and Arduino are complementary platforms and one doesn't exclude the other. If you combine their capabilities you can achieve amazing results. But why?
+  * The community! Arduino has a lot of materials readily available online, from libraries, to examples. If you have something in mind probably someone has already done it and shared the documentation.
+  * You might have a project that is already working on Arduino, but you might need just a bit more processing power, so the Raspberry can come to the rescue.
+  * The RPi doesn't go well with 5V logic levels, it only operates with 3.3V and its pins do not accommodate 5V.
+  * If you fry an Arduino you can replace the damaged microcontroller chip easily for less than £10. That gives you the freedom to experiment a bit more, without damaging the RPi.
+  * Raspbian operating system doesn't have real-time control capabilities, whereas a microcontroller like Arduino can handle those operations.
+  * Arduino is very easy to start up
+
+### Why Raspberry PI?
+
+The Raspberry Pi definitely performs best when there are heavy calculations into play but also is great for:
+* Internet or network connectivity projects (IoT)
+* Graphical applications
+* The need for USB peripherals such as a web cam
+* Big Data projects
+* ... and many more applications!
+
+To chose between the two there's is this [Make:zine article](http://makezine.com/2015/12/04/admittedly-simplistic-guide-raspberry-pi-vs-arduino/) that can help you out.
+
+### What are some alternatives to Raspberry Pi for the IoT?
+- [Arduino Yun](https://store.arduino.cc/arduino-yun) it is an Arduino with WiFi connection capabilities ideal for Iot
+- [Intel IoT Developer Kit](https://software.intel.com/en-us/iot/hardware/dev-kit)
+- [Photon](https://store.particle.io/) very tiny Wifi enabled board
+- [Beaglebone](http://beagleboard.org/bone) it is a Raspberry Pi competitor with some analog pins functionality
+- [ESP8266](http://espressif.com/en/products/hardware/esp8266ex/overview)
+
+### What are some alternative micro-controllers to Arduino?
+- [ARM mBed](https://os.mbed.com/platforms/mbed-LPC1768/)
+- [STM32](http://www.st.com/en/microcontrollers/stm32-32-bit-arm-cortex-mcus.html)
+- [Teensy](https://www.pjrc.com/teensy/)
+- [pyboard](https://store.micropython.org/#/store) runs microPython (comparison and guide with microPython vs. Arduino)
diff --git a/SupplementaryMaterial/Screen.md b/SupplementaryMaterial/Screen.md
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--- /dev/null
+++ b/SupplementaryMaterial/Screen.md
@@ -0,0 +1,50 @@
+## Virtual terminal: Screen
+
+Remember you can be connected to your RPi for up to 8 hours using **remot3.it**, after that time you have to connect again to your account and do the same access procedure we explained in the previous sections. Therefore we will show you how a *virtual terminal* can help you when you are working remotely on your RPi.
+
+**Screen** is a full-screen software program allows you to use multiple windows (virtual VT100 terminals) in Unix. It offers a user to open several separate terminal instances inside a one single terminal window manager.
+
+The screen application is very useful, if you are dealing with multiple programs from a command line interface and for separating programs from the terminal shell. It also allows you to share your sessions with others users and detach/attach terminal sessions.
+
+#### When to use Screen?
+
+One of the advantages of *Screen*, is that you can detach it. Then, you can restore it without losing anything you have done on the *Screen*. One of the typical scenario where *Screen* is of great help is when you are in the middle of SSH session and you want to download a file, update the operative, or transfer a big file to your RPi. The process could be 2 hours long. If you disconnect the SSH session, or suddenly the connection lost by accident, then the download process will stop. You have to start from the beginning again. To avoid that, we can use screen and detach it.
+
+#### Installing Screen
+Screen allows you to use multiple windows (virtual VT100 terminals) in Unix. If your local computer crashes, or you are connected remotely and lose the connection, the processes or login sessions you establish through screen don't get lost. To install Screen you can enter the following command on the RPi terminal:
+
+```bash
+sudo apt-get -y install screen
+```
+###### How to use Screen
+
+* When you are in your terminal, you can create a *screen* or virtual terminal e.g. we will name the screen *mysession*:
+
+<img src="../img/Screen_terminal.png" alt="screen1" style="width: 400px;"/>
+
+* Then you will be automatically attached to the *mysession* screen, that from now on we will call just *screen*. You can  now execute commands and work in the terminal without worrying to loose your work:
+
+<img src="../img/Screen_new_attached.png" alt="screen2" style="width: 400px;"/>
+
+* You can detach from the *screen* by pressing “Ctrl-A” and “d“. Once detached we will be on our RPi terminal outside any *screen* session. To check the list of *active screens*:
+
+<img src="../img/Screen_list.png" alt="screen3" style="width: 400px;"/>
+
+* We get a list with all the screen IDs. If we want to attach to a particular *screen* we can enter ```screen -r name_of_terminal``` like in the example below:
+
+<img src="../img/Screen_attaching.png" alt="screen4" style="width: 400px;"/>
+
+###### Basic commands to work with Screen
+
+|Screen command| Description|
+|:-------------|:-----------|
+| ```screen -S name_of_terminal```    | Assigning name to the virtual terminal or screen session.|
+|```screen -ls``` | List all the virtual sessions or screens opened. |
+|```screen -X -S name_of_terminal quit```| Kill an specific virtual terminal.|
+|```screen -r name_of_terminal```| Attach to the virtual terminal or screen.|
+| Press “Ctrl-A” and “d“ | Detach from virtual terminal  or screen.|
+| Press "Ctrl-A” and “K” | This command will leave and kill the virtual terminal or screen |
+| Press “Ctrl-A” and “n“ | Switching to the next virtual terminal or screen.|
+|Press “Ctrl-A” and “p“ | Switching to the previous virtual terminal or screen|
+
+For additional commands check out the [Screen Cheatsheet](ScreenCheatsheet.md)
diff --git a/SupplementaryMaterial/Screen_cheatsheet.md b/SupplementaryMaterial/Screen_cheatsheet.md
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--- /dev/null
+++ b/SupplementaryMaterial/Screen_cheatsheet.md
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+# Screen Cheasheet
+
+### Getting in
+|Description| Screen Command|
+|:-------------|:-----------|
+|start a new screen session with session name | ``` screen -S <name>``` |
+| list running sessions/screens | ``` screen -ls``` |
+| attach to a running session | ```screen -x``` |
+| attach to session name | ```screen -r <name>``` |
+| the “ultimate attach” |	```screen -dRR``` (Attaches to a screen session. If the session is attached elsewhere, detaches that other display. If no session exists, creates one. If multiple sessions exist, uses the first one.)
+
+### Escape key
+All screen commands are prefixed by an escape key, by default ```C-a``` (that's Control-a, sometimes written ^a). To send a literal C-a to the programs in screen, use ```C-a a```. This is useful when working with screen within screen. For example C-a a n will move screen to a new window on the screen within screen.
+
+### Getting out
+|Description| Screen Command|
+|:-------------|:-----------|
+| detach | ```C-a d``` |
+| detach and logout (quick exit) | ```C-a D D```|
+| exit screen | ```C-a ``` Exit all of the programs in screen (not recommended) |
+| force-exit screen | ```C-a C-\```(not recommended) |
+| getting out of the screen session | ```exit``` |
+
+### Window Management
+|Description| Screen Command|
+|:-------------|:-----------|
+| create new window | ```C-a c``` |
+| change to last-visited active window |  ```C-a C-a``` (commonly used to flip-flop between two windows) |
+| change to window by number | ```C-a <number>``` (only for windows 0 to 9) |
+| change to window by number or name | ```C-a ' <number or title>``` |
+| change to next window in list | ```C-a n``` or ```C-a <space>``` |
+| change to previous window in list | ```C-a p``` or ```C-a <backspace>``` |
+| see window list     | ```C-a "``` (allows you to select a window to change to) |
+| show window bar       | ```C-a w``` (if you don't have window bar) |
+| kill current window   | ```C-a k``` (not recommended) |
+| kill all windows   | ```C-a \``` (not recommended) |
+| rename current window | ```C-a A``` |
+
+### Split screen
+|Description| Screen Command|
+|:-------------|:-----------|
+| split display horizontally  |```C-a S``` |
+| split display vertically    |```C-a``` or ```C-a V``` (for the vanilla vertical screen patch) |
+| jump to next display region |```C-a tab``` |
+| remove current region       |```C-a X``` |
+| remove all regions but the current one |```C-a Q``` |
+
+### Clipboard and Navigation
+|Description| Screen Command|
+|:-------------|:-----------|
+|freely navigate buffer |	```C-a [``` or ```C-a <esc>```
+|toggle selection to copy |	space
+|paste |	```C-a ]```
+
+### Help
+|Description| Screen Command|
+|:-------------|:-----------|
+|help	| ```C-a ? ``` (lists keybindings)|
+
+### Misc
+|Description| Screen Command|
+|:-------------|:-----------|
+|redraw window |```C-a C-l```
+|monitor window for activity|	```C-a M```
+|monitor window for silence|	```C-a _```
+|enter digraph (for producing non-ASCII characters)|	```C-a C-v```
+|lock (password protect) session|	```C-a x```
+|enter screen command|	```C-a :```
+|enable logging in the screen session|	```C-a H```
+
+### Scrollback-buffer
+In copy mode, one can navigate the scrollback buffer in various ways:
+
+|Description| Screen Command|
+|:-------------|:-----------|
+|half page up |	```C-u```		
+|half page down |	```C-d```
+|back |	```C-b```
+|forward | ```C-f```
+|cursor left/down/up/right |	```h/j/k/l```
+
+
+For further information you can visit the [GNU screen website](http://aperiodic.net/screen/start).
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+# Syllabus for Design Engineering's Gizmo 2017-18
+
+### Introduction
+
+* [Linux (Bash) commands cheat sheet](../Introductory_Material/Cheat_sheet_bash_Linux.md)
+
+### Lab Session 1 (11 Oct 2017)
+
+* [Raspberry Pi set up](../Chapter_2_RPi/RPi_setup.md)
+* [Remote connection to your Raspberry Pi](../Chapter_5_Remote/Remote_Rpi.md)
+* [Warming up in Python](../Chapter_1_Python/Python_warmup.md)
+* [Week 1 Slides](./DE2-Gizmo-2017-Week1.pdf)
+
+### Lab Session 2 (18 Oct 2017)
+
+* [RPi GPIOzero](../Chapter_2_RPi/RPi_GPIO.md)
+* [Intro to Arduino](../Chapter_3_Arduino/Arduino_intro.md)
+* [Warming up in Arduino](../Chapter_3_Arduino/Arduino_warmup.md)
+* [RPi & Arduino](../Chapter_4_Arduino+RPi/RPi_to_Arduino.md)
+* [Week 2 Slides](./DE2-Gizmo-2017-Week2.pdf)
+
+### Lab Session 3 (25 Oct 2017)
+
+* [Sensors (Digital, ADC, LEDs, etc)](../Chapter_6_Sensors/Sensors.md)
+* [Actuators (Motor Driver, ADC, etc)](../Chapter_7_Actuators/Actuators.md)
+
+### Lab Session 4 (1 Nov 2017)
+
+* Ideation
+
+### Interim review (7 Nov 2017)
+
+* Interim review
+
+### Lab Session 5, 6, 7 (15, 22, 29 Nov 2017)
+
+* Tutorials
+
+### Lab Session 8 (6 Dec 2017)
+
+* Demo and presentation
+
+### Supplementary Material
+
+* [Alternative Network's Settings](../SupplementaryMaterial/Alternative_network_settings.md)
+* [Advanced remote functionalities](../SupplementaryMaterial/Advanced_remote_functionalities.md)
+* [Backing up your Raspberry Pi](../SupplementaryMaterial/Backing_up_RPi.md)
+* [RPi GPIO: Motor HAT](../SupplementaryMaterial/RPi_GPIO_MotorHat.md)
+* [Screen Cheatsheet](../SupplementaryMaterial/Screen_cheatsheet.md)
+* [Github Cheatsheet](../SupplementaryMaterial/git-cheat-sheet-education.pdf)
+* [Markdown Cheatsheet](../SupplementaryMaterial/Markdown_cheatsheet.md)
+* [Links](../SupplementaryMaterial/Links)
+* [Raspberry Pi or Arduino?](SupplementaryMaterial/RPi_or_Arduino.md)
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-# Setting up your Raspberry Pi
-In this section we explain how to set up your Raspberry Pi (RPi). Including the setting up of the WiFi at Imperial network and how to access remotely to your RPi.
-
-## Links to access from the Browser
-* [Installation guide](RPI_setup.md)
-* [Advance Remote Access](Advance_remoteconection.md)
-
-## Version in PDF
-* [Installation guide](RPI_setup.pdf)
-* [Advance Remote Access](Advance_remoteconection.pdf)
diff --git a/Week1/RPIsetup/RPI_setup.md b/Week1/RPIsetup/RPI_setup.md
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-# Setting up your Raspberry Pi 3 Model B
-
-### Starting Set up
-
- Each team should get a monitor, keyboard and mouse.
-* Insert the mini SD card in the Raspberry Pi , connect the mouse and keyboard in the USB ports, and the display with provided HDMI-DVI cable. Then,  using Y-cable, power it up by plugging in the charger.
-* The operative system starts. Then, click on the __terminal__ icon next to the menu to open it.
-* Then you need to run some commands in the terminal as root user to configure the Raspberry Pi (RPi). The **root user** has the permission to modify files or default settings as administrator providing the root password. The **root user** is **pi** and the default **root password** is **raspberry**. First we will make stronger the password, but first, we will change some default setups:
-
-``` bash
-$ sudo raspi-config
-```
-**Note:** To execute any Linux command as root user, the *sudo* command presides the Linux command.
-
-* The terminal will show a menu which can be navigated with the arrows on your keyboard and accept options with enter.
-
-<img src="raspi_config.png" alt="screen" style="width: 400px;"/>
-
-* Then we set up the keyboard to prevent any problem when changing the password, therefore we access the option: __Internationalisation Options --> Change the Keyboard Layout__. Then we choose generic 105 key, and then UK.
-* Also we have option to change the timezone from this menu.
-
-<img src="Internationalisation.png" alt="screen" style="width: 400px;">
-
- * To change the password, we return to the main menu and choose the second option. We have to set the new password and do not reboot the RPi yet.
-
-*  We check that the [ssh](https://en.wikipedia.org/wiki/Secure_Shell) for remote network communications is enabled (security shell cryptographic network protocol). We access to the __Advance Options --> SSH__.
-
-<img src="advance_opt.png" alt="screen" style="width: 400px;">
-
-* An optional step is to change the hostname in the same advance menu.
-* Then we restart the RPi.
-
-### Setting WiFi from Imperial College network
-
-* You will see there is no IP assigned to our PRI, therefore to set up the WiFi we need to modify a configuration file, but first we need to back it up:
-
-```bash
-$ sudo cp /etc/wpa_supplicant/wpa_supplicant.conf /etc/wpa_supplicant/wpa_supplicant.conf_backup
-```
-
-Then we will edit the *wpa_supplicant.conf*:
-```bash
-$ sudo nano /etc/wpa_supplicant/wpa_supplicant.conf
-```
-The default text editor installed in the RPi is _nano_. We can install also _vim_ or _vi_ to have another option of a text editor.
-
-This file should just have the next line at the beginning:
-```bash
-ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
-update_config=1
-```
-
-Then we add to the content of *wpa_supplicant.conf* the lines after # IC (**the configuration is case sensitive, so make sure you do not have typos**):
-
-```bash
-ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
-update_config=1
-
-
-# IC
-network={
-        ssid="Imperial-WPA"
-        proto=RSN
-        key_mgmt=WPA-EAP
-        pairwise=CCMP
-        auth_alg=OPEN
-        eap=PEAP
-        identity="ic\COLLEGE_USERNAME"
-        password="YOUR_PASSWORD"
-}
-```
-This is the Imperial College configuration in which you have to replace "COLLEGE_USERNAME" with a valid college username, please do not store your password in plain text, but we will change it after verifying that the WiFi is working. Reboot the system if it is necessary.
-**Note:** In case you are working with your team, and you do not want to show your password, just leave the field blank and follow the next steeps to encrypt your password before setting it up in the *wpa_supplicant.conf*.
-
-**Encrypting Password**
-
-In order to not store the password in a plain text we **encrypt** our password with an **MD4 hash generated** from the corresponding college password. You can generate the hash like this with the next Linux command:
-
-```bash
-$ echo -n 'YOUR_PASSWORD' | iconv -t utf16le | openssl md4
-```
-This command will display the encrypted password on your terminal like:
-```bash
-$ (stdin)= a6c71eedc2eacbca84003336a4a62a1c
-```
-Then you can copy the string that was generated in your terminal screen similar to the one of the example above: a6c71eedc2eacbca84003336a4a62a1c.
-
-**Note:** Also you can save the hash from your password in a file and then read its content:
-```bash
-$ echo -n 'YOUR_PASSWORD' | iconv -t utf16le | openssl md4 > hash.txt
-$ cat hash.txt
-```
-The *cat* command is used to read and concatenate files.
-
-Then open the *wpa_supplicant.conf* to add the hashed password you generate:
-
-```bash
-$ sudo nano /etc/wpa_supplicant/wpa_supplicant.conf
-```
-In the password field replace "YOUR_PASSWORD" with the string you generated as hexadecimal characters, and we add the 'hash:'-prefix) in the similar fashion as in the example bellow:
-
-```bash
-# IC
-network={
-        ssid="Imperial-WPA"
-        proto=RSN
-        key_mgmt=WPA-EAP
-        pairwise=CCMP
-        auth_alg=OPEN
-        eap=PEAP
-        identity="ic\COLLEGE_USERNAME"
-        password=hash:a6c71eedc2eacbca84003336a4a62a1c
-}
-```
-A last security step to do is to remove the bash history, with all the commands we had typed on the terminal. Therefore, we do it like:
-```bash
-$ history -w
-$ history -c
-```
-Then we reboot again the RPi to check that the password was properly set up.
-
-### Installing Python
-
-To install Linux packages in our system we must use the command: ```sudo apt-get install name_of_package```. The installation could take some minutes.
-
-**Updating operative system**
-```bash
-sudo apt-get update
-```
-**Installing C lib needed by Python:**
-```bash
-sudo apt-get -y install libffi-dev
-sudo apt-get -y install libssl-dev
-```
-**Installing Python:**
-
-```bash
-sudo apt-get -y install build-essential python-dev python-openssl
-sudo apt-get -y install python-setuptools
-sudo apt-get -y remove --purge python-pip
-sudo apt-get -y install python-pip
-sudo pip install --upgrade pip
-```
-**Installing other text editor:**
-```bash
-sudo apt-get -y install vim
-```
-### Remote connection to your Raspberry Pi
-**Weaved** services connect you easily and securely to your Pi from a mobile app, browser window and a terminal. Control remote computers using tcp hosts such as SSH. You will be able to connect to your RPi from laptop or desktop at home. The free weaved account allows for 10 registered services and 30 minute connections on up to 1 concurrent service(s).
-
-##### Installing weaved:
-Manage network devices remotely using [weaved](http://www.weaved.com/) service. To install:
-```bash
-sudo apt-get -y install weavedconnectd
-```
-
-##### Weaved configuration:
-
-* To configure weaved in our RPi, first we need to open an account in [weaved](https://developer.weaved.com/portal/login.php) website. You can register from your laptop or desktop. Once you have it, from your Rpi terminal you will execute a command to link your RPi to your weaved account:
-```bash
-sudo weavedinstaller
-```
-* Enter your Weaved account username and password. Next, you will see this menu:
-
-<img src="Pi-installer-menu.png" alt="menu1" style="width: 300px;"/>
-
-* Initially you won’t have any Weaved services installed, so the upper part is empty.  Enter **1** to attach Weaved to an existing TCP service (host) on your Raspberry Pi.  You should now see the following screen:
-
-<img src="Pi-installer-menu-02.png" alt="menu2" style="width: 300px;"/>
-
-Enter **1** for SSH.
-
-* Next, we accept the default port (**y**).
-
-<img src="Pi-installer-menu-03.png" alt="menu3" style="width: 300px;"/>
-
-* The installer confirms your choice and asks you to give this connection a name (you can make it up, but remember to make a name easy for you to identify a specific RPi in case you have more than one attached to the weaved service.):
-
-<img src="Pi-installer-menu-04.png" alt="menu4" style="width: 300px;"/>
-
-You will now return to the main menu, where you can see your Weaved Service Connection installed, then enter **3** to exit.
-
-<img src="Pi-installer-menu-051.png" alt="menu5" style="width: 300px;"/>
-
-### Accessing from your computer (Linux or Mac OS X)
-
-We sill see here how you can access using your laptop or any other desktop from any terminal. First, if you login to your weaved account,  you will get a list of the services linked to your devices:
-
-<img src="weaved_connected.png" alt="weaved" style="width: 400px;"/>
-
-In your case you will have just one item with a Type SSH as in the first line at the screen shoot above. When you click on the name of you device, your browser will open and show you a widow like:  
-
-<img src="weaved_ssh.png" alt="weaved" style="width: 400px;"/>
-
-Then we copy the command after *For pi username*, in this example it is: ```ssh -l pi proxy71.weaved.com -p 34644```. For you it will be different. Then, paste the command in your laptop or desktop terminal (If you are using a Mac or Linux all will work, but for windows you have to [install a SSH and Telnet client](http://www.chiark.greenend.org.uk/~sgtatham/putty/)).
-
-Then, you are connected from your laptop to your RPi!! You don't need the display and mouse anymore!
-
-### Accessing from your computer (Windows)
-
-If your computer operative  system is Windows, to access remotely you will need to install PuTTY, which  is a free implementation of SSH and Telnet for Windows and Unix platforms. To download it click [here]( http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html).
-
-<img src="Putty.JPG" alt="weaved" style="width: 400px;"/>
-
-Once downloaded, double click on the **putty.exe** and you will see the window looks like below:
-
-<img src="PuttyConnect.JPG" alt="weaved" style="width: 400px;"/>
-
-Then, if you login to your weaved account,  you will get a list of the services linked to your devices:
-
-<img src="weaved_connected.png" alt="weaved" style="width: 400px;"/>
-
-In your case you will have just one item with a Type SSH as in the first line at the screen shoot above. When you click on the name of you device, your browser will open and show you a widow like:  
-
-<img src="weaved_ssh.png" alt="weaved" style="width: 400px;"/>
-
-Insert the server address and port obtained from Weaved.com into Putty and connect!
-
-When asked for username and password, please use your RPi username and password to log-in. (Please note, this is not weaved username and password).
-
-To exit your putty session, type "exit" and enter.
-
-### Virtual terminal
-
-Remember you can just be connected during 30 minutes using **weaved**, after that time you have to connect again to your account and do the same procedure we explained in the previous section. Therefore we will show you how a *virtual terminal* can help you when you are working on your RPi.
-
-**Screen** is a full-screen software program allows you to use multiple windows (virtual VT100 terminals) in Unix. It offers a user to open several separate terminal instances inside a one single terminal window manager.
-
-The screen application is very useful, if you are dealing with multiple programs from a command line interface and for separating programs from the terminal shell. It also allows you to share your sessions with others users and detach/attach terminal sessions.
-
-##### When to use screen?
-
-One of the advantages of *Screen*, is that you can detach it. Then, you can restore it without losing anything you have done on the *Screen*. One of the typical scenario where *Screen* is of great help is when you are in the middle of SSH session and you want to download a file, update the operative, or transfer a big file to your RPi. The process could be 2 hours long. If you disconnect the SSH session, or suddenly the connection lost by accident, then the download process will stop. You have to start from the beginning again. To avoid that, we can use screen and detach it.
-
-###### Installing screen
-The screen program allows you to use multiple windows (virtual VT100 terminals) in Unix. If your local computer crashes, or you are connected remotely and lose the connection, the processes or login sessions you establish through screen don't get lost.
-
-```bash
-sudo apt-get -y install screen
-```
-###### Some Examples to use screen
-
-* When you are in your terminal, you can create a *screen* or virtual terminal e.g. we will name the screen *mysession*:
-
-<img src="Screen_terminal.png" alt="screen1" style="width: 400px;"/>
-
-* Then you will be automatically attached to your screen or virtual terminal, that from now on we will call just *screen*. You can execute now commands and work in the terminal:
-
-<img src="Screen_new_attached.png" alt="screen2" style="width: 400px;"/>
-
-* You can detach from the *screen* by pressing “Ctrl-A” and “d“. Then we will go to our terminal outside the *screen* session. Then we can check the list of *screens*:
-
-<img src="Screen_list.png" alt="screen3" style="width: 400px;"/>
-
-* We get the list and the screen ID. If we want to attach to a particular *screen*:
-
-<img src="Screen_attaching.png" alt="screen4" style="width: 400px;"/>
-
-###### Basic commands to work with the virtual terminals
-
-|Screen command| Description|
-|:-------------|:-----------|
-| ```screen -S name_of_terminal```    | Assigning name to the virtual terminal or screen session.|
-|```screen -ls``` | List all the virtual sessions or screens opened. |
-|```screen -X -S name_of_terminal quit```| Kill an specific virtual terminal.|
-|```screen -r name_of_terminal```| Attach to the virtual terminal or screen.|
-| Press “Ctrl-A” and “d“ | Detach from virtual terminal  or screen.|
-| Press "Ctrl-A” and “K” | This command will leave and kill the virtual terminal or screen |
-| Press “Ctrl-A” and “n“ | Switching to the next virtual terminal or screen.|
-|Press “Ctrl-A” and “p“ | Switching to the previous virtual terminal or screen|
-
-For more examples go to the [link](http://www.tecmint.com/screen-command-examples-to-manage-linux-terminals/) or ask the instructors.
-
-To know more about more advance details of how connect remotely go to the [advance guide](Advance_remoteconection.md):
-
-## Some useful tips and troubleshooting guides
-
-### Backup RPi Image
-
-It is useful and advisable to backup a working copy of your RPi image. For example, make a backup copy after setting up WiFi and update the library, the next time the wifi is not working, you can reformat the SD card and reinsert this backup copy to revert back to previous version. After this, your RPI get to connect back to WiFi right away like before. Here are the steps:
-
-#### For Backing up:
-
-##### For Windows and Mac OS
-
-1. Download Win 32 Disk Imager if none installed on your computer [here]( https://sourceforge.net/projects/win32diskimager/)
-2. Insert the SDCard into your computer (e.g. via card reader or SD card slot if your computer has one).
-3. Open Win 32 Disk Imager. Select a location and give a file name for the backup image.
-4. Select the right drive.
-5. Click Read.
-6. Once done, keep this backup copy safe. Please note that the size of the backup is the same size of your SD Card. SO please be mindful that it will take a considerable amount of disk space.
-
-##### For replacing the image on the SD Card
-
-#### For Windows and Mac OS
-
-1. Download SDFormatter if none installed [here](https://www.sdcard.org/downloads/formatter_4/).
-2. Download Win 32 Disk Imager if none installed [here](https://sourceforge.net/projects/win32diskimager/) or Etcher For Mac [here](https://www.etcher.io).
-3. Use SDFormatter to format the SD card. Please be careful and make sure you select the correct drive letter.
-4. Use Win 32 Disk Imager or Etcher to re-image the backed up image into the SD card. I.e. select the file name, the drive letter of the SD card, and then click Write. Please be careful that the correct drive letter is selected. If you wish to install a fresh Raspbian OS, you can download it [here](www.raspberrypi.org).
-5. Once this is done, a new image has been rewritten on your SD Card!
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-# Raspberry Pi GPIO-Part 1
-
-Your Raspberry Pi is more than just a small computer, it is a hardware prototyping tool! The RPi has **bi-directional I/O pins**, which you can use to drive LEDs, spin motors, or read button presses. To drive the RPi's I/O lines requires a bit or programming. You can use a [variety of programing languages](http://elinux.org/RPi_Low-level_peripherals#GPIO_Code_examples), but we decided to use a really solid, easy tools for driving I/O: **Python**.
-
-## Material needed
-
-* Raspberry Pi 3 B
-* [Breadboard](https://www.sparkfun.com/products/12002?_ga=1.251311686.1915117394.1476705504)
-* [Jumper Wires(M/F)](https://www.sparkfun.com/products/12794)
-* [Momentary Pushbutton Switch](https://www.sparkfun.com/products/9190?_ga=1.213562324.1915117394.1476705504)
-* [2 Resistors](https://www.sparkfun.com/products/11507?_ga=1.213562324.1915117394.1476705504)
-* [2 LEDs](https://www.sparkfun.com/products/9590?_ga=1.213548756.1915117394.1476705504)
-
-##  GPIO Pinout
-
-Raspberry has its GPIO over a standard male header on the board. From the first models to the latest, the header has expanded from 26 pins to 40 pins while maintaining the original pinout.
-
-<p align="center">
-<img src="rpi_old_new_pin.jpg" alt="rpi" width="500">
-</p>
-
-There are (at least) two, different numbering schemes you may encounter when referencing **Pi pin numbers**:
-
-1. **Broadcom (SoC) chip-specific** pin numbers.
-2. **P1 physical** pin numbers.
-
-You can use either number-system, but when you are programming how to use the pins, it requires that you declare which scheme you are using at the very beginning of your program. We will see this later.
-
-The next table shows all 40 pins on the P1 header, including any particular function they may have, and their dual numbers:
-
-<p align="center">
-<img src="header_pinout.jpg" alt="pin" width="500">
-</p>
-
-In the next table, we show another numbering system along with the ones we showed above: **Pi pin header numbers and element14 given names, wiringPi numbers, Python numbers, and related silkscreen on the wedge**. The Broadcom pin numbers in the table are related to RPi Model 2 and later only.
-
-<p align="center">
-<img src="Pi_pin_header_numbers.png" alt="pin" width="500">
-</p>
-
-This table shows that the RPi not only gives you access to the bi-directional I/O pins, but also [Serial (UART)](https://learn.sparkfun.com/tutorials/serial-communication), [I2C](https://learn.sparkfun.com/tutorials/i2c), [SPI](https://learn.sparkfun.com/tutorials/serial-peripheral-interface-spi), and even some Pulse width modulation ([PWM](https://learn.sparkfun.com/tutorials/pulse-width-modulation) — “analog output”).
-
-
-### Analog vs. Digital
-
-Before starting with our practise, we will revise the difference between **analog** and **digital** signals. Both are used to transmit information, usually through **electric signals**. In both these technologies, the information, such as any audio or video, is transformed into electric signals. The **difference between analog and digital**:
-
-* In **analog technology**, information is translated into electric pulses of varying amplitude.
-
-* In **digital technology**, translation of information is into binary format (zero or one) where each bit is representative of two distinct amplitudes.
-
-<img src="analog_digital.png" alt="pin" style="width: 300px;"/>
-
-#### Comparison chart
-
-||Analog	|Digital|
-|:------|:-------|:-------|
-|**Signal**| Analog signal is a continuous signal which represents physical measurements.|	Digital signals are discrete time signals generated by digital modulation.|
-|**Waves**|	Denoted by sine waves.|	Denoted by square waves.|
-|**Representation**| Uses continuous range of values to represent information.|	Uses discrete or discontinuous values to represent information.|
-|**Example**|	Human voice in air, analog electronic devices.|	Computers, CDs, DVDs, and other digital electronic devices.|
-|**Technology**| Analog technology records waveforms as they are.|	Samples analog waveforms into a limited set of numbers and records them.|
-|**Data transmissions**|Subjected to deterioration by noise during transmission and write/read cycle.|Can be noise-immune without deterioration during transmission and write/read cycle.|
-|**Response to Noise**|	More likely to get affected reducing accuracy|	Less affected since noise response are analog in nature|
-|**Flexibility**|	Analog hardware is not flexible.|Digital hardware is flexible in implementation.|
-|**Uses**|Can be used in analog devices only. Best suited for audio and video transmission.|	Best suited for Computing and digital electronics.|
-|**Applications**|Thermometer|PCs, PDAs|
-|**Bandwidth**|	Analog signal processing can be done in real time and consumes less bandwidth.|	There is no guarantee that digital signal processing can be done in real time and consumes more bandwidth to carry out the same information.|
-|**Memory**| Stored in the form of wave signal.|Stored in the form of binary bit.|
-|**Power**|	Analog instrument draws large power.|	Digital instrument drawS only negligible power.|
-|**Cost**|Low cost and portable.|	Cost is high and not easily portable.|
-|**Impedance**|	Low	|High order of 100 megaohm|
-|**Errors**|Analog instruments usually have a scale which is cramped at lower end and give considerable observational errors.|	Digital instruments are free from observational errors like parallax and approximation errors.|
-
-## Hardware Setup
-
-We start assembling the circuit as shown in the diagram bellow. We will use two LEDs to test the output functionality (digital and PWM-Pulse-width Modulation), and a button to test the input.
-
-<p align="center">
-<img src="pracise_1.png" alt="pinboard" width="450">
-</p>
-
-
-In the next table you will see which RPi's pins we are suing:
-
-##### Leds
-
-| Broadcom chip-specific numbers| P1 Pin Number|
-|:----------|:----------|
-|GPIO 18|12|
-|GPIO 23|16|
-
-##### Button
-
-| Broadcom chip-specific numbers| P1 Pin Number|
-|:----------|:----------|
-|GPIO 17|11|
-
-##### Ground
-| Broadcom chip-specific numbers| P1 Pin Number|
-|:----------|:----------|
-|Ground|6|
-
-
-## Python (RPi.GPIO) API Example
-
-We will use the **RPi.GPIO module** as the driving force behind our Python examples. These Python files and source is included with Raspbian, so assuming you are running the latest Linux distribution, you do not need to download anything to get started. Let's see an example:
-
-1. From your terminal in your laptop connect to your RPi.
-2. Create a folder call "code", then a file call "blinker.py":
-
-```bash
-$ mkdir code
-$ cd code
-$ touch blinker.py
-```
-3. Then we open it with our text editor:
-
-```bash
-$ nano blinker.py
-```
-
-4. Then, copy the next code in your text editor. This code assumes we have set up the circuit as we arranged above.
-
-```python
-#!/usr/bin/env python
-
-
-# External module imports GPIO
-import RPi.GPIO as GPIO
-# Library to slow or give a rest to the script
-import time
-
-
-# Pin definiton using Broadcom scheme
-# PWM (Analog)
-pwmPin = 18  # Broadcom pin 18 (P1 pin 12)
-# Led
-ledPin = 23  # Broadcom pin 23 (P1 pin 16)
-# Button
-butPin = 17  # Broadcom pin 17 (P1 pin 11)
-
-dc = 95  # duty cycle (0 i.e 0%/LOW and 100 ie.e 100%/HIGH) for PWM pin
-
-
-# Pin Setup:
-GPIO.setmode(GPIO.BCM)  # Broadcom pin-numbering scheme
-GPIO.setup(ledPin, GPIO.OUT)  # LED pin set as output
-GPIO.setup(pwmPin, GPIO.OUT)  # PWM pin set as output
-# PWM (Analog) Output
-pwm = GPIO.PWM(pwmPin, 50)  # Initialize PWM on pwmPin 100Hz frequency
-# Button pin set as input w/ pull-up resistors
-GPIO.setup(butPin, GPIO.IN, pull_up_down=GPIO.PUD_UP)
-
-
-# Initial state for LEDs:
-GPIO.output(ledPin, GPIO.LOW)
-# This function set an initial value of the frequency
-pwm.start(dc)
-
-
-print("Here we go! Press CTRL+C to exit")
-try:
-    while 1:
-        # The input() function will return either a True or False
-        # indicating whether the pin is HIGH or LOW.
-        if GPIO.input(butPin):  # button is released
-            pwm.ChangeDutyCycle(dc)  # Adjust the value of the PWM output
-            GPIO.output(ledPin, GPIO.LOW)
-        else:  # button is pressed:
-            pwm.ChangeDutyCycle(100-dc)
-            GPIO.output(ledPin, GPIO.HIGH)
-            # Delay of 75 milliseconds
-            time.sleep(0.075)
-            GPIO.output(ledPin, GPIO.LOW)
-            # Delay of 75 milliseconds
-            time.sleep(0.075)
-except KeyboardInterrupt:  # If CTRL+C is pressed, exit cleanly:
-    pwm.stop()  # stop PWM
-    GPIO.cleanup()  # cleanup all GPIO
-
-```
-
-5. Running the script needs administrator privileges because of the RPi.GPIO module requires it. So we run the following commands:
-
-To make the script an executable:
-
-```bash
-$ sudo chmod u+x blinker.py
-$ ./blinker.py
-```
-
-With the code running, press the button to turn on the digital LED. The PWM-ing LED will invert its brightness when you press the button as well.
-
-## Python (RPi.GPIO) API: Overview of the basic function calls used in our example.
-
-### Setup Section
-
-* When we use Python to control our GPIO pins, we always need to import the corresponding Python module, which goes at the top of the script:
-
-```python
-import RPi.GPIO as GPIO
-```
-
-In here, we are giving a shorter name to the module "GPIO", to call the module through our script.
-
-* It is important to define which of the two **pin-numbering schemes** you want to use:
-  1. ```GPIO.BOARD```– **Board numbering scheme**. The pin numbers follow the **pin numbers on header P1**.
-  2. ```GPIO.BCM``` – **Broadcom chip-specific pin numbers**. These pin numbers follow the lower-level numbering system defined by the Raspberry Pi’s Broadcom-chip brain.
-
-To specify in your code which number-system is being used, use the GPIO.setmode() function as:
-
-```python
-GPIO.setmode(GPIO.BCM)
-```
-This will activate the Broadcom-chip specific pin numbers.
-
-### Setting a Pin Mode
-
-You have to declare a “pin mode” before you can use it as either an input or output. To set a pin mode, use the ```setup([pin], [GPIO.IN, GPIO.OUT]``` function. So, if you want to set pin 18 (in the BCM) or 12 (in the BOARD) as an output, for example:
-
-```python
-GPIO.setup(18, GPIO.OUT)
-```
-
-### Output
-
-#### Digital Output
-
-To write a pin high or low, use the ```GPIO.output([pin], [GPIO.LOW, GPIO.HIGH])``` function. For example, if you want to set pin 18 (in the BCM) high:
-
-```python
-GPIO.output(18, GPIO.HIGH)
-```
-
-Writing a pin to ```GPIO.HIGH``` will drive it to 3.3V, and ```GPIO.LOW``` will set it to 0V. For the lazy, alternative to ```GPIO.HIGH``` and ```GPIO.LOW```, you can use either ```1```, ```True```, ```0``` or ```False``` to set a pin value.
-
-#### Pulse-width Modulation (PWM-“Analog”) Output
-
-To initialize PWM, use ```GPIO.PWM([pin], [frequency])``` function. To make the rest of your script-writing easier, you can assign that instance to a variable. Then use ```pwm.start([duty cycle])``` function to set an initial value. For example, we can set PWM to pin up with a frequency of 1kHz, and set that output to a 50% duty cycle:
-
-```python
-pwm = GPIO.PWM(18, 1000)
-pwm.start(50)
-```
-
-To adjust the value of the PWM output, use the ```pwm.ChangeDutyCycle([duty cycle])``` function. ```[duty cycle]``` can be any value between 0 (i.e 0%/LOW) and 100 (ie.e 100%/HIGH). So to set a pin to 75% on, for example, you could write:
-
-```python
-pwm.ChangeDutyCycle(75)
-```
-
-To turn PWM on that pin off, use the ```pwm.stop()``` command. Just don’t forget to set the pin as an output before you use it for PWM.
-
-### Inputs
-
-If a pin is configured as an input, you can use the ```GPIO.input([pin])``` function to read its value. The ```input()``` function will return either a ```True``` or ```False``` indicating whether the pin is HIGH or LOW. You can use an if statement to test this. For example, in the next lines of code the GPIO library will read pin 17 (in the BCM) and print whether it is being read as HIGH or LOW:
-
-```python
-if GPIO.input(17):
-    print("Pin 11 is HIGH")
-else:
-    print("Pin 11 is LOW")
-```
-#### Pull-Up/Down Resistors
-
-In the ```GPIO.setup()``` function, we saw above, where we declared whether a pin was an input or output, we can use a third parameter to set pull-up or pull-down resistors: ```pull_up_down=GPIO.PUD_UP``` or ```pull_up_down=GPIO.PUD_DOWN```. For example, to use a pull-up resistor on GPIO 17 (in the BCM), write this into your setup:
-
-```python
-GPIO.setup(17, GPIO.IN, pull_up_down=GPIO.PUD_UP)
-```
-
-If nothing is declared in that third value, both pull-resistors will be disabled.
-
-### Others
-
-#### Setting up delays
-
-If you need to slow down your Python script, you can add delays by incorporating the [time module](https://docs.python.org/2/library/time.html) at the top of your script as:
-
-```python
-import time
-```
-
-Then, you can use ```time.sleep([seconds])``` to give your script a rest. You can use decimals to precisely set your delay. For example, to delay 250 milliseconds, write:
-
-```python
-time.sleep(0.25)
-```
-
-### Garbage Collecting
-
-Once your script has run its course, be kind to the next process that might use your GPIOs by cleaning up after yourself. Use the ```GPIO.cleanup()``` command at the end of your script to release any resources your script may be using. Your RPi will survive if you forget to add this command, but it is good practice to include wherever you can.
-
-
-## Suggested readings
-
-* [Pulse-Width Modulation](https://learn.sparkfun.com/tutorials/pulse-width-modulation) – You can use PWM to dim LEDs or send signals to servo motors. The RPi has a single PWM-capable pin.
-* [Light-Emitting Diodes (LEDs)](https://learn.sparkfun.com/tutorials/light-emitting-diodes-leds) – To test the output capabilities of the Pi we will use some Leds.
-* [Switch Basics](https://learn.sparkfun.com/tutorials/switch-basics) – To test inputs to the Pi, we will use buttons and switches.
-* [Pull-Up Resistors](https://learn.sparkfun.com/tutorials/pull-up-resistors) – The Pi has internal pull-up (and pull-down) resistors. These are very handy when you are interfacing buttons with the little computer.
-
-
-**References**[[1](http://www.diffen.com/difference/Analog_vs_Digital), [2](https://learn.sparkfun.com/tutorials/raspberry-gpio)]
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