homebridge-dht-rgpio

A temperature/humidity sensor service plugin for Homebridge using a DHTxx. The sensor is accessed using the python3-rgpio package which means this works on kernels 5.11 and above (when the kernel GPIO interface changed).

• Display of temperature, humidity from a DHTxx connected to a RaspberryPI.
• Support the graphing feature of the Eve app for trends

Installation

On the machine hosting HomeBridge:

1. Install Homebridge using npm install -g homebridge
2. Install Python3 rgpio with sudo apt-get install python3-rgpio
3. Install this plugin npm install -g @townsen/homebridge-dht-lgpio
4. Update your configuration file - see below for an example

On the machine to which the DHTxx is attached:

1. Install the rgpio daemon with sudo apt-get install rgpiod

Configuration

• accessory: "DHTxx"
• name: descriptive name
• loglevel: 0 = none, 1 = each reading, errors are always logged
• hostname: The name of the remote host
• gpiochip: the gpio chip to use (optional, default 0)
• gpio: the pin to which the device is connected (optional, default 4)
• 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.
• recordpath: Optional, used by the fakegato history code to create an on-disk record of the observations. This preserves the history in case of a restart, and can be used to extract the observations manually. The sensor device is named dht-<gpiochip>-<gpio> which is then used to create the filename: homebridge_<device>_persist.json.

Simple Configuration

This is fine if you just have one device called "Temperature", but if you have more then their persisted readings will collide!

{
  "bridge": {
    "name": "Example for DHT22 using LGPIO",
    "username": "AB:A2:44:66:6E:36",
    "port": 51826,
    "pin": "023-66-204"
  },
  "accessories": [
    {
      "accessory": "DHTxx",
      "name": "Sensor",
      "name_temperature": "Temperature",
      "name_humidity": "Humidity",
      "recordpath": "/save/me",
      "refresh": 35,
      "hostname": "remote.machine",
      "gpiochip": 0
      "gpio": 5
    }
  ],
  "platforms": []
}

This plugin creates two services: TemperatureSensor and HumiditySensor.

Credits

This was adapted from the two projects below:

• homebridge-bme280
• homebridge-am2320

The python script to read the DHT devices came from

• The driver writer

License

MIT