I wrote this code to automate watering of my raised beds from a rain barrel using a Raspberry Pi Zero W, and a Pimoroni Automation pHAT.
When run via systemd, it will daemonize and listen to an MQTT topic for events. Additionally, a cron-like schedule can be set to trigger automatic watering.
When it determines it should water the gardens (based on time since last water, or the weather forecast from my Tempest Weather System), it activates the relay on the Automation Phat board, which triggers a relay attached to the rain barrel that runs an RV water pump for a predetermined amount of time.
Additionally, I have it integrated with Home Assistant and Node-Red, so the MQTT messages it emits it will send me push notifications, and can handle Siri shortcuts to water, skip the next automated watering, or stop watering.
The Automation pHAT requires that I2C be enabled on the Raspberry Pi, which can be done in raspi-config
under the Interfacing Options section.
Bedwetter is configured via a config file that should reside at ${HOME}/.config/bedwetter/bedwetter.cfg
and contains something along the lines of:
[bedwetter]
debug = false
log_file = /var/log/bedwetter.log
log_to_file = true
mqtt_hostname = <Hostname of your mqtt server>
mqtt_password = <Your mqtt broker password>
mqtt_port = 8883
mqtt_topic = bedwetter
mqtt_username = <Your mqtt broker username>
notify_on_failure = true
notify_on_inaction = true
notify_on_service = true
notify_on_success = true
schedule = 0 8 * * *
station_id = <Your Tempest station id>
threshold_days = 2
threshold_percent = 50
timeout = 5
water_duration = 600
weatherflow_api_key = <Your WeatherFlow API key>It should be noted that this project is a bit rough around the edges as I didn't really intend to distribute it, but I thought people might be interested in it.
Bedwetter makes use of pip and virtualenv, so install those via your system's package manager first. Then it's just a matter of running make install in the root of this project.