homebridge-bme280

Bosch BME280 temperature/humidity/barometric pressure sensor service plugin for Homebridge.

• Display of temperature, humidity and Barometric Pressure from a BME280 connected to a RaspberryPI.
• Archives results every hour to a google spreadsheet
• Support the graphing feature of the Eve app for trends

Forked from homebridge-280 to use bme280, which has a full implementation of the BME280 options. See the datasheet for all oversampling and filtering options.

Installation

0. Ensure that you have i2c support in your OS. For Raspbian (Bullseye) do:

   apt-get install i2c_tools libi2c_dev modprobe i2c_dev add i2c_dev to /etc/modules

1. Install Homebridge using npm install -g homebridge

2. Install this plugin npm install -g @iainfarq/homebridge-bme280

3. Update your configuration file - see below for an example

Follow the excellent directions in the bme280 package to connect the device to the I2C bus.

Configuration

• accessory: "BME280"
• name: descriptive name
• name_temperature (optional): descriptive name for the temperature sensor
• name_humidity (optional): descriptive name for the humidity sensor
• refresh: Optional, time interval for refreshing data in seconds, defaults to 30 seconds.
• options: options for bme280. Note that the 'forcedMode' option is set to true by default; this should better match any homebridge use - self heating is reduced, and the sensor is only active once per refresh cycle.

If you get an I/O error, make sure the I2C address is correct (usually 0x76 or 0x77 depending on a jumper).

Simple Configuration

{
  "bridge": {
    "name": "BME280Example",
    "username": "CB:22:33:E2:CE:31",
    "port": 51826,
    "pin": "033-44-254"
  },
  "accessories": [
    {
      "accessory": "BME280",
      "name": "Sensor",
      "name_temperature": "Temperature",
      "name_humidity": "Humidity",
      "options": {
        "i2cBusNo": 1,
        "i2cAddress": "0x77"
      }
    }
  ],
  "platforms": []
}

More complex configuration, using all available bme280 options:

{
  "bridge": {
    "name": "BME280Example",
    "username": "CB:22:33:E2:CE:31",
    "port": 51826,
    "pin": "033-44-254"
  },
  "accessories": [
    {
      "accessory": "BME280",
      "name": "Sensor",
      "name_temperature": "Temperature",
      "name_humidity": "Humidity",
      "refresh": 15,
      "options": {
        "i2cBusNo": 1,
        "i2cAddress": "0x77",
        "humidityOversampling": "OVERSAMPLE.X8",
        "pressureOversampling": "OVERSAMPLE.X16",
        "temperatureOversampling": "OVERSAMPLE.X2",
        "filterCoefficient": "FILTER.F16",
        "standby": "STANDBY.MS_20",
        "forcedMode": false
      }
    }
  ],
  "platforms": []
}

This plugin creates two services: TemperatureSensor and HumiditySensor.

Problems

If you get ... bindings

[24/09/2023, 10:42:27] ERROR LOADING PLUGIN @townsen/homebridge-bme280: [24/09/2023, 10:42:27] Error: Could not locate the bindings file. Tried: → /var/lib/homebridge/node_modules/@townsen/homebridge-bme280/node_modules/i2c-bus/build/i2c.node → /var/lib/homebridge/node_modules/@townsen/homebridge-bme280/node_modules/i2c-bus/build/Debug/i2c.node → /var/lib/homebridge/node_modules/@townsen/homebridge-bme280/node_modules/i2c-bus/build/Release/i2c.node → /var/lib/homebridge/node_modules/@townsen/homebridge-bme280/node_modules/i2c-bus/out/Debug/i2c.node → /var/lib/homebridge/node_modules/@townsen/homebridge-bme280/node_modules/i2c-bus/Debug/i2c.node → /var/lib/homebridge/node_modules/@townsen/homebridge-bme280/node_modules/i2c-bus/out/Release/i2c.node → /var/lib/homebridge/node_modules/@townsen/homebridge-bme280/node_modules/i2c-bus/Release/i2c.node → /var/lib/homebridge/node_modules/@townsen/homebridge-bme280/node_modules/i2c-bus/build/default/i2c.node → /var/lib/homebridge/node_modules/@townsen/homebridge-bme280/node_modules/i2c-bus/compiled/18.16.0/linux/arm/i2c.node → /var/lib/homebridge/node_modules/@townsen/homebridge-bme280/node_modules/i2c-bus/addon-build/release/install-root/i2c.node → /var/lib/homebridge/node_modules/@townsen/homebridge-bme280/node_modules/i2c-bus/addon-build/debug/install-root/i2c.node → /var/lib/homebridge/node_modules/@townsen/homebridge-bme280/node_modules/i2c-bus/addon-build/default/install-root/i2c.node → /var/lib/homebridge/node_modules/@townsen/homebridge-bme280/node_modules/i2c-bus/lib/binding/node-v108-linux-arm/i2c.node at bindings (/var/lib/homebridge/node_modules/@townsen/homebridge-bme280/node_modules/bindings/bindings.js:126:9) at Object. (/var/lib/homebridge/node_modules/@townsen/homebridge-bme280/node_modules/i2c-bus/i2c-bus.js:4:32) at Module._compile (node:internal/modules/cjs/loader:1254:14) at Object.Module._extensions..js (node:internal/modules/cjs/loader:1308:10) at Module.load (node:internal/modules/cjs/loader:1117:32) at Function.Module._load (node:internal/modules/cjs/loader:958:12) at Module.require (node:internal/modules/cjs/loader:1141:19) at require (node:internal/modules/cjs/helpers:110:18) at Object. (/var/lib/homebridge/node_modules/@townsen/homebridge-bme280/node_modules/bme280/bme280.js:3:13) at Module._compile (node:internal/modules/cjs/loader:1254:14)

Then you need to do an install in the i2c-bus module. npm install. This recompiles the C bindings.

Credits

• NorthernMan54 - Barometric Pressure and Device Polling
• simont77 - History Service
• fivdi - Comprehensive implementation of the BME280 interface

License

MIT