co2-sensor-apple-homekit

Apple homekit accessory to monitor true CO2 levels.

Hardware required:

• ESP32 development board
• Sensirion SCD30 Sensor Module

Wiring

SCD30 VIN <-----> ESP32 3V3

SCD30 GND <-----> ESP32 GND

SCD30 SCL <-----> ESP32 GPIO22 (this can be configured in sdkconfig with CONFIG_MY_SCANNER_I2C_SCLK_GPIO_NUM)

SCD30 SDA <-----> ESP32 GPIO21 (this can be configured in sdkconfig with CONFIG_MY_SCANNER_I2C_SDA_GPIO_NUM)

Build and Run using docker

1. Clone the repo

    git clone https://github.com/SCVready/co2-sensor-apple-homekit
   

2. Init submodules

    cd co2-sensor-apple-homekit
    git submodule update --init --recursive
   

3. Set the Wifi SSID and the password in the sdkconfig file:

    CONFIG_APP_WIFI_SSID={Your 2Ghz wifi SSID}
    CONFIG_APP_WIFI_PASSWORD={Wifi password}
   

4. Build and run

    docker run -it --mount type=bind,source="$(pwd)",target=/home/project --device=/dev/ttyUSB0 scvready/esphomekit:latest /home /home/project buildrun
   

   If you have more than one USB connected to your PC, replace /dev/ttyUSB0 with the one that represents the ESP32,

   if you see on the logs lines like the following:

    app_wifi: Connected with IP Address:...
    Co2Sensor: Measures ready
    Co2Accessory: CO2: 775.36 ppm
    Co2Accessory: Temperature: 21.00 °C
    Co2Accessory: Relative humidity: 70.39 %RH
   

   you have wired correctly the ESP32 and the SCD30, and the ESP32 is connected correctly to your Wifi.

   Congratulations!

   If not, you can open an issue here :) I'll try to help and improve documentation.

   Exit the docker with docker stop {container}, ESP32 will keep running. And next time it's booted, it´'ll load the program as well.

Pairing

If your Iphone is on the same network as the sensor, use the Add Accessory option in your Home app.

You can search for your sensor by using the camera and the QR code that the build/run log output shows (at the very beginning) or you can just use More options..., the sensor should be listed there. Use the password 111-22-333.

If there is any error when trying to pair the sensor, you can press and hold for 10 seconds the Boot button on the ESP32, this will remove all the local data that the ESP32 is storing from previous pairings.