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Homebridge-purpleair

Homebridge plugin that is showing information about air quality from PurpleAir API.

Project is based on homebridge-weather and homebridge-arinow.

Installation

1. Install Homebridge using: (sudo) npm install -g --unsafe-perm homebridge.
2. Install this plugin:
   1. find the directory that homebridge was installed in (e.g. /usr/local/lib/node-modules)
   2. create homebridge-purpleair in that directory
   3. copy index.js and package.js into this directory
   4. make sure the file/directory ownership and RWX permissions are the same as other modules in that directory
3. Update your homebridge configuration file like the example below.

This plugin is returning only: AQI (Air Quality Index) and PM2.5

Configuration

Example config.json

"accessories": [
    {
          "accessory": "PurpleAir",
          "purpleID": "PURPLE_AIR_STATION_ID",
          "updateFreq": MIN_SECS_BETWEEN_API_READ,
          "name": "PurpleAir Air Quality"
    }
]

Config file

Fields:

• accessory must be "PurpleAir" (required).
• purpleID PurpleAir Station ID (a number).
• updateFreq minimum number of seconds between reads from PurpleAir API (a number - default is 90 seconds)
• name Is the name of accessory (required).

To find your specific "PURPLE_AIR_STATION_ID" (a string):

1. Use the PurpleAir Map to locate a station (https://www.purpleair.com/map)
2. Open this URL in a new Window or Tab: (https://www.purpleair.com/json)
3. Search for the NAME of the station you found in step A (using JSONview in Google Chrome makes this a bit easier)
4. The Station ID is the first element in the results[:] map - you will enter this ID (1-5 digits) into the preferences for the Air Quality Station
   1. If you have an outdoor sensor, there should be 2 entries in the big JSON file, one for each sensor. Please use only the FIRST entry - the code will find the second and average the values, as done for the PurpleAir map.