This repo contains all the data of a home-made electronic moisture sensor project.
The moisture sensor is linked to a microcontroller, that reads the current moisture and temperature value. These values are then displayed on a small screen, also driven by the microcontroller. The entire setup is powered by two coin cell batteries, and can be switched on and off using a switch. A Jack outlet allows driving an automatic sprinkler, although the sprinkler project is still ongoing.
Almost all the components necessary for the project are directly available from Mouser, for less than $50. The casing, however, has to be 3D-printed. The PCB connecting the electronic components together also has to be custom-made, or more likely ordered from a PCB manufacturer. A soldering iron and some tin is ultimately required for soldering all the components to the PCB.
The moisture sensor is Adafruit's STEMMA soil sensor, the microcontroller is Adafruit's Trinket M0, and the display is Adafruit's monochrome 128x32 I2C OLED display. The switch, connectors, and cables are also from Adafruit.
This repo contains :
- the bill of materials for ordering the various components from Mouser
- the .stl files for 3D-printing the casing
- the KiCad files for ordering the PCB from a PCB manufacturer
- the MicroPython code to upload to the microcontroller for driving the setup
- tools that were handful for the project
Pictures of the final assembly :
