PiDration

PiDration is a software and hardware implementation of a soil analytics platform that I use to monitor my plants because they kept dying. Horribly

Table of Contents

• Hardware
• Software
  • C++
  • Python
  • RF24 library

Hardware

The server is a Raspberry Pi 400 all-in-one.

Each slave is a Arduino nano microcontroller that communicates with a hydration sensor via i2c.

Slaves and the server communicate via RF signal connected via SPI.

Software

C++

Slaves run on a very C-like subset of C++. The communication is facilitated with the RF24 library.

Python

The server is a threaded python code. that spins up three threads. One for controlling output to a 16x2 LCD, One for listening for communications from the slaves, and a main thread that queries the Database.

The database is a SQLite 3 DB. with the following shemea:

sensor        OTM ->     data                
----------               ---------
*id                      *id
name                     value
node                     date
threshold                sensor_id
                         FOREIGN KEY(sensor_id) REFERENCES sensor(sensor_id)