Simple ESP32 Soil Saturation Probe

Features:

• Measures soil mosture at 3 depths to determine field saturation.
• Site configuration is stored in config file. Just copy a new file over the serial connection.
• Regularly sends soil saturation to influxdb

Hardware

• ESP32. We use this WROVER one because it has the extra RAM.
• Three Soil Moisture Probes. We use these
• Power Source. We use a single solar panel
• Battery. We use a small usb battery to handle the spikes in power consumption when transmitting via wifi and cover cloudy days, etc.

Building & Installing

MicroPython Environment Installation

Download micropython (spiram-idf4) here

sudo apt get install esptool
esptool.py --port /dev/ttyUSB0 erase_flash
esptool.py --port /dev/ttyUSB0 --baud 460800 write_flash --flash_size=detect 0x1000 ./micro-python/esp32spiram-idf4-20191220-v1.12.bin

Installing the Python code

pip3 install adafruit-ampy --upgrade
ampy --port /dev/ttyUSB0 put config.py /config.py
ampy --port /dev/ttyUSB0 put main.py /main.py