builder555/balena-gmc300

Balena Blocks: GMC-300/GMC-320 communicator

Reads CPM (counts per minute) value from a GMC3xx-series geiger counter and publishes it to MQTT endpoint, if it reaches a specified limit. Automatically turns on the geiger counter, if it's off.

Usage as a block

Add the following to your docker-compose.yaml:

  gmc300:
    privileged: true
    build: ./balena-gmc300
    restart: always
    environment:
      - MQTT_TOPIC=CPM_ALERT
      - CPM_LIMIT=50
      - MQTT_HOST=mqtt

Example published payload: WARNING: 89CPM

NB: When deploying a microservices application, use balena push --multi-dockerignore <UUID> to ensure that the .dockerignore file is processed.

Available variables

Environment Variable	Default	Description
`READ_PERIOD`	5	How often to read CPM values (seconds)
`NOTIFICATION_COOLDOWN`	30	How many seconds to wait after a notification, before sending another one
`CPM_LIMIT`	100	Notify, if CPM reaches this value
`MQTT_TOPIC`	'CPM_ALERT'	MQTT topic, under which to publish
`MQTT_HOST`	'mqtt'	Broker hostname
`MQTT_USER`	''	Username to connect to MQTT broker
`MQTT_PASS`	''	Password to connect to MQTT broker

Tests

$ PIPENV_VENV_IN_PROJECT=1 pipenv install --dev
$ pipenv shell
$ pytest -vs

builder555 / balena-gmc300

Balena Blocks: GMC-300/GMC-320 communicator

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