ESP gateway from temperature and humidity sensor and Apple HomeKit

Introduction

HomeKit is a framework developed by Apple for communicating with and controlling connected accessories in a user’s home using iOS devices. ESP HomeKit SDK has been developed in-house by Espressif to build Apple HomeKit compatible accessories using ESP32/ESP32-S2/ESP32-C3/ESP8266 SoCs.

Features of this gateway:

• Support for Xiaomi 2 sensor by BLE (LYWSD03MMC, official and custom firmware)
• Support for DHT11/12 sensor by GPIO
• Support for DHT22/21 sensor by GPIO
• Support for AHT10/20 sensor by I2C (with additional BMP280)

Get Started

Set up Host environment

Set up the host environment and ESP IDF (master branch) as per the steps given here.

Please clone this repository using the below command:

git clone https://github.com/worknd/hap-gateway.git

Compile and Flash

You can use esp-homekit-sdk with any ESP32 or ESP32-C3 board (I have tested only with the ESP32-DevKit-C and ESP32-C3-DevKit). I use hard-coded Wi-Fi credentials, so please set the ssid and passphrase by navigating to idf.py menuconfig -> HAP-Gateway Configuration -> WiFi SSID/Password Compile and flash as below:

$ cd /path/to/hap-gateway
$ export ESPPORT=/dev/tty.SLAB_USBtoUART #Set your board's serial port here
$ idf.py set-target <esp32/esp32c3>
$ idf.py flash monitor

As the device boots up and it has found your sensor, you will see QR code for HomeKit.

Add acccessory in the Home app

Open the Home app on your iPhone/iPad and follow these steps:

• Tap on "Add Accessory" and scan the QR code mentioned above.
• Tap on the accessory in the list of Nearby Accessories.
• Select the "Add Anyway" option for the "Uncertified Accessory" prompt.
• Enter 11122333 as the Setup code.