Datalogger library for Arduino

This is a simple library for reading noisy analog inputs in Arduino.

Useful functions

Datalog

Datalog is a class for averaging noisy input and storing highlights.

Datalog(int valuesCount = 32, int eeprom_address = -1)

Initialize a datalogger class, with the designated amount of storage. If eeprom_address is specified, the minimums and maximums will be persisted there.

void update(double value)

Set the latest value.

double getValue()

Get current (smooth) value. This will be an average of the latest values given in with update(double).

MinMaxVal getExtremes()

Get a struct that contains the record high and low.

struct MinMaxVal
{
    double min;
    double max;
};

void resetExtremes()

Reset the minimum and maximum value.

boolean isMoving()

Returns true, if a fast change was noticed on last update, and therefore the value was changed to a "new normal".

Example

For now, it looks like this:

#include <Datalog.h>

// init with pin number and number of samples to
// store for averaging
Datalog temperature(A2, 32);

void setup() {
  Serial.begin(9600);
}

void loop() {
  // calculate temperature from reading
  double voltage = (val / 1024.0) * 5.0;
  double temp = ( voltage - 0.5 ) * 100;
  
  // run this often, it will keep your average better
  temperature.update(temp);

  // get the smoothed value
  double val = temperature.getValue(); 
  
  Serial.print(temp);
  Serial.println(" deg C");
  
  delay(100);
}

Button

Button is a class for attaching multiple functions to buttons. Attach only one function per time, and try to add enough time between them (like at least one second). After a button press, the callback with longest matching delay will be executed.

attachFunction(void (*callback)(), int delay = 0))

Add a new listener to button, will be executed if button is pressed for at least the amount of milliseconds specified in delay.

update(char value)

Update the value of the input and execute callbacks as necessary. Give in HIGH or LOW (usually directly from digitalRead()).

Example

char BUTTON_PIN = 0;
Button b;

void myAction()
{
    // do something here when button pressed
}

void longAction()
{
    // do something here when button pressed for one second
}

void setup()
{
    pinMode(BUTTON_PIN, INPUT);
    b.attachFunction(myAction);
    b.attachFunction(longAction, 1000);
}

void loop()
{
    b.update(digitalRead(BUTTON_PIN));
}
```


### Settings

The file `settings.h` includes #defines you can comment away to save some space by removing unnecessary code.