Homebridge GPIO

Supports triggering General Purpose Input Output (GPIO) pins on the Raspberry Pi.

Requirements

Homebridge - HomeKit support for the impatient
gpio-admin - Use the GPIO pins on the Raspberry Pi without running as root

Installation

Install Homebridge using npm install -g homebridge
Install this plugin npm install -g homebridge-gpio
Update your configuration file - see sample-config.json in this repo
Install my forked version of gpo-admin (abandoned project):

git clone git://github.com/jamesblanksby/quick2wire-gpio-admin.git
cd quick2wire-gpio-admin
make
sudo make install
sudo adduser $USER gpio

Configuration

Example config.json

{
  "accessories": [
    {
      "accessory": "GPIO",
        "name": "GPIO4",
        "pin": 7,
        "duration": 4000
    }
  ]
}

Pin Configuration

An extract from: pi-gpio:

This couldn't have been more confusing. Raspberry Pi's physical pins are not laid out in any particular logical order. Most of them are given the names of the pins of the Broadcom chip it uses (BCM2835). There isn't even a logical relationship between the physical layout of the Raspberry Pi pin header and the Broadcom chip's pinout. The OS recognizes the names of the Broadcom chip and has nothing to do with the physical pin layout on the Pi. To add to the fun, the specs for the Broadcom chip are nearly impossible to get!

P1 - 3.3v	1	2	5v
I2C SDA	3	4	--
I2C SCL	5	6	Ground
GPIO	7	8	TX
--	9	10	RX
GPIO	11	12	GPIO
GPIO	13	14	--
GPIO	15	16	GPIO
--	17	18	GPIO
SPI MOSI	19	20	--
SPI MISO	21	22	GPIO
SPI SCLK	23	24	SPI CE0
--	25	26	SPI CE1
Model A+ and Model B+ additional pins
ID_SD	27	28	ID_SC
GPIO	29	30	--
GPIO	31	32	GPIO
GPIO	33	34	--
GPIO	35	36	GPIO
GPIO	37	38	GPIO
--	39	40	GPIO

That gives you several GPIO pins to play with: pins 7, 11, 12, 13, 15, 16, 18 and 22 (with A+ and B+ giving 29, 31, 32, 33, 35, 37, 38 and 40). You should provide these physical pin numbers to this library, and not bother with what they are called internally. Easy-peasy.

Licence

(The MIT License)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.