Just another ESP32 irrigation system

Small irrigation system for the balcony to keep plants happy

Lars Wessels

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Description

When we began to grow the tomatoes this April, I decided to improve and automate a drip system last summer with an ESP32 which should receive commands from automations in Home Assistant. The basic idea was to control the four irrigation branches separately with solenoid valves, which are controlled via MQTT just like the main pump. In addition, some sensors should regularly report soil moisture to Home Assistant to better control irrigation depending on weather conditions. I looked around on GitHub but didn't find a project that met my needs, so I build just another irrigation system.

Details

water pump and 4 solenoid valves can be controlled via MQTT e.g. Home Assistant
controller settings can be adjusted via web interface (available in German/English)
offers simple stand-alone scheduler to water plants once a day
ultrasonic sensor ensures minimal water level in reservoir
only one valve can be opened at a time to maximize pressure on each dripping branch
valves will switch off after preset time and then blocked to avoid accidental over-watering
writes events and sensor readings to log file in ESP32 flash including log rotation
creates a local access point for initial system setup or if no Wifi is available
OTA firmware updates

https://github.com/lrswss/esp32-irrigation-automation