This is a Homebridge plugin for SGP30 eCO2 and TVOC sensor, working on the Raspberry Pi 3.

It uses read() and write() syscalls on the I2C devices exposed by Linux's filesystem.

Before running this plugin, you must add the homebridge user to the i2c group so Homebridge can access the I2C dev interface. sudo adduser homebridge i2c

If showTemperatureTile is true, a temperature tile will show up in Home with the TVOC in ppb scaled by a factor of ten (e.g. 25.2 C = 252ppb).

The mqttConfig object is only required if enableMQTT is true, and is defined as follows:

{
  "bridge": {
    "name": "Homebridge",
    "username": "XXXX",
    "port": XXXX
  },

  "accessories": [
    {
      "accessory": "SGP30",
      "name": "SGP30",
      "enableFakeGato": true,
      "enableMQTT": true,
      "mqtt": {
         "url": "mqtt://192.168.0.38",
         "eCO2Topic": "sgp30/eCO2",
         "TVOCTopic": "sgp30/TVOC"
      }
    },
  ]
}

• All things required by Node are located at the root of the repository (i.e. package.json and index.js).
• The rest of the code is in src, further split up by language.
  • c contains the C code that runs on the device to communicate with the sensor. It also contains a simple C program that communicates with the sensor.
  • binding contains the C++ code using node-addon-api to communicate between C and the Node.js runtime.
  • js contains a simple project that tests that the binding between C/Node.js is correctly working. It also contains a characteristic that enables Eve to keep a historical graph of air quality (i.e. eCO2).