Overview

This plug-in is for displaying the carbon dioxide concentration measurement result of MH-Z19 on HomeKit through homebridge.

Wiring diagram

Preparation settings

① Enable serial port

② Give read permission to the homebridge user on the serial port

Install

Configuration example of config.json

    "accessories": [
        {
            "accessory": "CO2Sensor",
            "name": "CO2 Sensor",
            "uart_path": "/dev/ttyXXX",
            "schedule": "*/5 * * * *",
            "warning_level": 1500
        }
    ]

• accessory → Fixed value [required field]
• name → To your liking [required field]
• uart → Specify the UART to which MH-Z19 is connected in ttyXXX format.
• schedule → Specify the acquisition interval of CO2 concentration.
• warning_level → A warning will be displayed when CO2 exceeds this level.