Lazylights: IoT Lights for the Lazy and Cheap

Rough diagram: HomeKit <-> Homebridge <-> Homebridge-http <- REST API on Local Network -> Arduino Ethernet Module <-> Arduino

Requirements:

• Arduino (tested with Arduino Nano)
• Arduino Ethernet Module (tested with ENC28J60 module)
• Device capable of running Homebridge (tested with Raspberry Pi 3, W, Intel Xeon server running Debian)
• The light you want to control, along with hardware to allow your Arduino to control it. (LED strip, 12V power supply, and high power NMOS or BJT)

Steps:

• Setup Homebridge
  • Make sure HomeKit apps can talk to Homebridge
• Setup Arduino
  • Make sure you can make REST requests to the Arduino and that the Arduino can respond to them
• Configure Arduino and Homebridge to talk together
  • Tell Homebridge what routes to use and how to use them
  • Tell Arduino what routes to respond to and how to act on them

Possible Improvements:

• Obtain a IP address using DHCP
• Learn node.js, fork Homebridge-http and add support for more devices on Homebridge-http and on the Arduino
• Using Ethercard or other ethernet libraries to get a smaller memory footprint (less of a problem on the Arduino Mega, big problem on the Uno and Nano)

Acknowledgements

Homebridge-http config is a slightly tweaked example config provided by homebridge-http

The arduino code for implementing a basic REST server is a heavily modified version of the code found here, under UIPEthernet. Great article, highly recommended read if you want to use a ENC28J60-based ethernet devices.