Arduino and Apple HomeKit Integration - Control Your Home From Siri! IoT Is Here





Introduction: Arduino and Apple HomeKit Integration - Control Your Home From Siri! IoT Is Here

This Instructable will give you a quick and easy way to add an arduino board to Apple's HomeKit on an iOS device. It opens up all sorts of possibilities including Scripts running on the server, combined with Apples HomeKit "Scenes", it makes for a powerful combo!

This is by no means a complete solution or ready for long term use but it demonstrates what's possible with a bit more work :) Check out my blog for future projects

Whats needed:

  • Arduino with Ethernet Shield or WiFi
  • Raspberry Pi or some other server
  • Solid State Relay or Normal relay with control circuit
  • Bread board - optional
  • Project Box
  • Some Time
  • iOS device
  • Extension Lead to carve up

Step 1: Setup the Server

This project requires the use of a server to run the HomeBridge software. I used a Raspberry Pi as I had it readily available but in theory anything that can run Node.Js should work!

You can follow this guide here to get this up and running on a Raspberry Pi. Other instructables are around to build a Raspberry Pi if you need those!

Once installed you need install a plugin and customise the config.json file

Step 2: Config and Plugins

Open your config.json file which should be in ~/.homebridge/config.json using your favourite text editor and add the following

"bridge": {

"name": "Homebridge",

"username": "CC:22:3D:E3:CE:30",

"port": 51826,

"pin": "031-45-154"


"platforms": [


"accessories": [


"accessory": "Http",

"name": "Living Room Lamp",

"on_url": "",

"off_url": "",

"http_method": "GET"




You will also need to install the homebride-http plugin. The HomeBridge software will make HTTP GET requests to the Arduino which will then turn the Solid State Relay on or off. The call looks like this:



To install the plugin type:

npm install homebridge-http

Step 3: Setup the Solid State Relay

I have used quite a heavy duty Solid State Relay. This can be (and will be in future versions of this) replaced for something much smaller. Obviously rate this for the load you intend to run off it.

This is effectively a 'Smart' extension lead now.

The positive Leg of the Solid State relay will connect to pin 5 on the arduino.

The negative will connect to the GND pin.

All usual warnings apply when dealing with 120/ 220 vdc - TAKE CARE.

Step 4: Connect the Solid Sate Relay and Upload the Arduino Code

Open up your arduino environment and upload this sketch.

Customise your IP address as needed.

This should now be ready for testing.

Launch homebridge on the server!

Step 5: Test!

Now that everything is in place its time to test!

Download Elgatu Eve from the App Store on you iOS device.

You should see Homebridge as an accessory available to be connected. Use the pin number 031-45-154, this can be customised in the config.json file.

Once connected you can move this around within the App into the desired Room etc. Give Siri a test! It should be able to control the relay using voice!

Step 6: Next Steps

The plan is to shrink this down and use something like a Nano and embed this in Lightswitches / wall sockets with much smaller Relays and use WiFi for a complete Home Automation system.

Hope someone gets some use out of this! Many thanks to Nick Farina for his work on the Homebridge Software!

A video is coming soon.

Check out my blog:

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Please be positive and constructive.




Hello ! i have everything running ! But can we use the same idea on NodeMcu ? it is cheaper and smaller too !!

Hej, thank you for your great tutorial! What I didn't understand:

- What exactly is the purpose of node.js?

- If I do not want to use a raspberry pi (I do not have any), what are my options? I heard that Homekit devices can be controlled by AppleTV -- can I use the AppleTV for this project, too? And how?

why do you need arduino if you use raspberri bi? it would be cool to use just arduino and run the homekit server there

Hello ... I did it. Only a problem. the pin5 is high for a while and soon low. I checked the code from the web page with out homebridge. I'm afraid that a delay for the links (on and off) are necessary because you activate on and off at the same time. Can you check the code? a request ... How to add more controls ( 2 or more relay)?

use this instead. It did the trick for me...

if(readString.indexOf("?on") >0)//checks for on


if(readString.indexOf("?off") >0)//checks for off


This was what I was looking for!!

thank you that was driving me crazy i spent an hour trying to fix it myself

I've redone my blog Going to start updating it with more projects and post them here too!

Hi I am 99%, I got the homebridge loaded on Ubuntu and was able to pair the homebridge on Elgato Eve, the only problem is after that homebridge appeared as an accessory, I still have no control of my device. siri does not seem to recognize the command "please open my Garage Door" in the Eve "setup" I saw Accessory Name "Homebridge" Manufacturer: default, Model: default, serial number: default The homebridge is in room garage and the above setup is in the "accessory Info" Am I missing some thing?

Of course, I've changed the ip addresses to a static address. Homebridge also recognized my name change to "My Garage Door" instead of "Living Room Lamp". The arduino code loaded up without a hitch. I am using an Xboard, which is combined Arduino Leonado and two relays. The relays are on D7 and D8 so I made the appropriate changes in the .ino skatch as well. I used ping 7 instead of ping 5 and made the changes throughout the skatch