A raspberry pi project to automate my irrigation system mainly based on a raspberrypi and rain bird dv100 24vac solenoid valves

Last Update : 16/10/2023
This is the first working version for summer 2023, it will be adapted for 2024.

Main Goal : replace one or more irrigation controllers and do it by mylself.

Big Concept :

• Logic is done by python scripts on the rpi
• Data management is done with an sql data base, mqtt, json, yaml
• UI is based on a web application or in Home Assistant
• Sensors data comes from home-assistant/esphome

Overall functional descriptions :

• A WebApp allows me to manage each solenoid valve/zone, global parameters, see the latest events, the watering sequence and some data.
• A collection of python scripts are used to open or close the solenoid valves and compute the watering sequence
  • There is a winter/stop, test, , sequence on demande, automatic and domotic/manual mode
  • The program checks some data to know if it can run watering
  • Each change is logged
  • status are logged and send to an mqtt brocker
  • Errors and status are displayed on an lcd
  • The raspberry pi can run the irrigation without lan network and internet. In that case, json files are used for the configuration but it is impossible to change anything.
• config.yaml file is used to configure the script in addition with the database.
• I can bypass the programmation to directly power supply and open any solenoid valve I want with 3 positions switch wired for each solenoid valve.
• Monitoring and filling of the tank are managed by home assistant (see side projects)
• There is also a first implementation of mqtt to exchange data with home-assistant

Folder organisation :

| IrriPi
  => | App ( SqlDatabase and WebApp(php,html,css,js) )
     | Doc    (img / Schematic / Diagram / Fritzing parts / Useful docs for the project )  
     | rpi (python scripts)
     readme.md

Raspberry Pi requirements :

Config.txt :
In the event of an unexpected restart, this will allow not to open a solenoid valve by mistake.
I need to add the following to the config.txt file to force gpio output and high state on gpio during the boot sequence :

gpio=4-13=op,dh
gpio=16-27=op,dh

Gpio 2,3 are used for I2C (rtc and lcd)
Gpio 14-15 are reserved and cannot be used !

=> 22 gpio are therefore usable

Cron :

• start the main.py at startup
• start the mqtt_subscribe.py at startup
• in contrab -e:

  @reboot sleep 20; sh /home/pi/launcher_arrosage.sh

Raspi-config :

• i2c must be activated (rtc + lcd)
• spi must be deactivated

Functional Diagram :

Electric Parts

• 1x Circuit breaker 2A 230v
• 1x Electrical outlet 230v
• 1x AC 24v 1,6A output rail din power supply (for solenoid valves) links
• 1x DC 5v 2.5A output power supply (for raspberry, esp8266, relay, electronic)

Electronics Parts

• Raspberry Pi 2b + micro sd
• 22x relay 5v
• 22x button 3 positions
• 1x button 2 positions
• 23x Screw Fuse Terminal Block rail din links
• 22x fuse 20x5 0.5A
• 1x fuse 20x5 2A
• 1x lcd 20x4 i2c 5v
• 1x rtc module DS3231 i2c 5v

Web App :

The web app :

Schematic :

Side projects (in progress) :

• Tank filling with esphome and home-assistant link
• [in progress] tank monitoring with esphome and home-assistant link
• Irrigation circuit monitoring with esphome and home-assistant link

Incomplete Work :

• mqtt
• web ui
• logging
• lcd
• code

Futur improvements :

• Improve WebUI
• Multiple sequence
• Add condition with rain meter
• Improve code / mqtt
• Clean the box with good cable management

Integration in Home-Assistant **