MicroPython ESP32 based Soil Moisture Sensor Node

You can add the sm.py library file to your MicroPython project. The main.py is a simple and straightforward implementation of sm.py for demonstration but should be replaced with your actual project file.

For working with the files, you will need the development dependencies. These can be installed like:

pip install -r dev-requirements.txt

Download a MicroPython for the ESP32: https://micropython.org/download/esp32/

Rename the file to esp32.bin.

Connect the device and erase the flash:

esptool.py --chip esp32 --port <PORT> erase_flash

Then upload MicroPython to the device

esptool.py --chip esp32 --port <PORT> --baud 460800 write_flash -z 0x1000 esp32.bin

The <PORT> has to be replaced by the port where the device is connected. On Linux that is typically something like /dev/ttyUSB0 (you can ls the /dev/tty*), on Windows its one of the COM, like COM3.

If you run into communication errors, you can choose a slower baud rate like 115200

First, rename sm_config.json.example to sm_config.json and adjust the file content to your needs. You can use an IDE like thonny (pip install thonny) to upload the files, or ampy:

You can copy all firmware files to your board like:

ampy --port <PORT> put ./src/*

Important: That will also copy the boot.py and main.py over and repalce existing files! The minimum required files are the sm.py and its configuration in sm_config.json. You can add (or upgrade) them like:

ampy put --port <PORT> put src/sm.py
ampy put --port <PORT> put src/sm_config.json