A simple Python app that reads temperature and humidity values from HTU31D I2C sensor and reports to an MQTT broker in a format compatible with Home Assistant.
On initialisation a message is published to the config MQTT topic to add the sensors to Home Assistant using the MQTT Discovery service.
The sensor name added to Home Assistant is the Host Name of the sensor, typically a Raspberry Pi.
This is expected to run on a Raspberry Pi - tested on both the Pi4 and Pi2.
Connect the Adafruit HTU31D sensor to I2C bus 1.
Enable I2C using raspi-config.
You'll need an MQTT broker, the code assumes it's on the same machine. In the code, change localhost to match the IP of the MQTT broker if this is not the case.
Clone this repo.
Install dependencies:
sudo apt-get install -y i2c-tools libgpiod-devInstall python dependencies:
pip3 install -r requirements.txtCopy service file:
sudo cp ./home-assistant-htu31d.service /lib/systemd/system/Reload the system manager:
sudo systemctl daemon-reloadEnable the service:
sudo systemctl enable home-assistant-htu31d.serviceStart the service
sudo systemctl start home-assistant-htu31d.serviceCheck status:
sudo systemctl status home-assistant-htu31d.serviceAs long as Home Assistant is already integrated wih your MQTT broker, new sensors as entities: sensor.<HOSTNAME>_temperature_htu31d and sensor.<HOSTNAME>_humidity