Envirophat MQTT

Poll a Pimoroni envirophat and publish to MQTT

Install

pip install envirophat_mqtt

python3 ./setup.py sdist install

Configure

usage: envirophat_mqtt [-h] [--mqtt_host MQTT_HOST] [--mqtt_topic MQTT_TOPIC]
                   [--mqtt_clientid MQTT_CLIENTID] [--mqtt_port MQTT_PORT]
                   [--poll_time POLL_TIME] [--overscan OVERSCAN]

optional arguments:
  -h, --help            show this help message and exit
  --mqtt_host MQTT_HOST
                        MQTT host
  --mqtt_topic MQTT_TOPIC
                        MQTT topic
  --mqtt_clientid MQTT_CLIENTID
                        MQTT client ID
  --mqtt_port MQTT_PORT
                        MQTT port
  --poll_time POLL_TIME
                        How often in seconds to poll (60)
  --overscan OVERSCAN   How many readings to average together during the
                        polltime

A systemd unit file is provided for use. You may want to edit the settings in the ExecStart line of this file before installing. Copy to /etc/systemd/system/ and then run systemctl daemon-reload.

Use with homeassistant

This is my setup, in my sensors.yaml file:

# garage envirophat
- platform: mqtt
  name: garage_temperature
  state_topic: merope/envirophat/temperature
  unit_of_measurement: '°C'
- platform: mqtt
  name: garage_pressure
  state_topic: merope/envirophat/pressure
  unit_of_measurement: 'hPa'
- platform: mqtt
  name: garage_lux
  state_topic: merope/envirophat/lux
  unix_of_measurement: 'lux'

I run envirophat_mqtt with the following ExecStart:

ExecStart=/usr/local/bin/envirophat_mqtt --mqtt_host elgafar.garbled.net --mqtt_topic merope/envirophat --mqtt_clientid merope

Making sure it works

Run the following command: mosquitto_sub -v -t "#" -h <your MQTT server>

Watch for messages from the envirophat.