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Automation for Airthings + Nest Thermostat

Use Airthings measurements to control Nest Thermostat to ensure healthy air and comfortable temperatures.

This is mostly just the Airthings and Nest libraries to get you started. You'll need to impliemnt your own logic to control fans or HVAC.

Fan Thresholds

  • Radon >= 2.7 pCi/L / >= 100 Bq/m3
  • PM2.5 >= 10 ug/m3
  • VOC >= 250 ppb
  • CO2 >= 800 ppm
  • Humidity 25% >= x >= 60%

Adjust AC if...

  1. AC is on, but the measured temp from Airthings does not match Nest

Requirements

Hardware

  • Airthings View Plus. I've only tested it with the View, but it should work with other devices
  • Nest Thermostat

Setup

  • Smart Device Management (SDM) API - There are several steps to get API access. I followed this article. Note: to get API access, you must pay a one-time $5 fee to Google.
  • Airthings API - You'll need an Airthings account to generate an API key.
  • Python/Pipenv
  • Optional: update values in config.yaml
  • If running locally, setup environment variables. If running via GitHub Actions, setup repo secrets. 
    AIRTHINGS_CLIENT_ID
AIRTHINGS_CLIENT_SECRET
NEST_PROJECT_ID
NEST_CLIENT_ID
NEST_CLIENT_SECRET
NEST_REDIRECT_URI
NEST_CODE
NEST_ACCESS_TOKEN
NEST_REFRESH_TOKEN
  • If running for the first name you'll need to run nest.get_code() and add the output to the env variable NEST_CODE.