Homebridge Relays Stateless

TLDR: In my house I have relays that send a pulse to invert the current state of the light. And since homekit only has switches, this automatically reports the switch as off after 2 seconds, so the next time it is pressed it will invert the state. (this only happens if you set duration_ms)

Controls 4 channel relays with a Raspberry Pi using HomeKit.

Hardware

The hardware is quite simple to construct.

1. A Raspberry Pi
2. Relay module pins are connected to 4 GPIO pins (GPIO-17, 27, 22, 05).

The raspberry pi can then control the state of the relays

Installation

1. Install homebridge using: sudo npm install --unsafe-perm -g homebridge
2. Install this plugin using: sudo npm install -g --unsafe-perm homebridge-relays-stateless
3. Update your configuration file. See config-sample.json in this repository for a sample.

Sample Configuration

{
  "bridge": {
    "name": "RelayServer",
    "username": "CC:22:3D:E3:CE:FA",
    "port": 51826,
    "pin": "031-45-155"
  },

  "description": "4 Channel Relay",

  "accessories": [
    {
      "accessory": "Relay-Stateless",
      "name": "Relay-1",
      "pin": 11
      "invert": true,
      "default_state": false,
      "duration_ms": 1000
    },
    {
      "accessory": "Relay-Stateless",
      "name": "Relay-2",
      "pin": 13
      "invert": false,
      "default_state": false,
      "duration_ms": 3600000
    },
    {
      "accessory": "Relay-Stateless",
      "name": "Relay-3",
      "pin": 15
    },
    {
      "accessory": "Relay-Stateless",
      "name": "Relay-4",
      "pin": 29
    }
  ],

  "platforms": []
}

Accessory Configuration Options

Name	Meaning
accessory	Accessory type. Relay (REQUIRED)
name	Default name for the accessory.(REQUIRED)
pin	Which pin number to use for this accessory.(REQUIRED)
invert	If true, output on pin is LOW for ON , and HIGH for OFF .(Default: false)
default_state	State to set on start of homebridge. true for ON , false for OFF .(Default: false / OFF )
duration_ms	If given, accessory will stay ON for this many milliseconds, then turn OFF. Timer resets if accessory is turned ON again while it is still ON.(Default: 0/None)