LYWSD03MMCSensor is a Javascript class to connect and get measurements from LYWSD03MMC (Xiaomi Mijia Bluetooth Thermometer 2) sensors using Bluetooth Web API.

This code has been tested in a computer with Windows 11 beta 21H2 and Edge 93.

Take in count:

• At the time of writing (24th September 2021) Bluetooth Web API is in development stage. API may change and the code may stop working in any moment.
• To enable Bluetooth Web API on Microsoft Edge you have to go to edge://flags/ and set the flag experimental-web-platform-features to true

See file index.html

1. Include a reference to the script file LYWSD03MMCSensor.js in your HTML page.
2. Use Bluetooth Web API to select the device you want to connect to.
3. Create a new instance of LYWSD03MMCSensor and pass the device in the constructor.
4. Add event listener for onMeasurement to get temperature and humidity measurements.
5. Optional: Add event listener for onLogMessage to get debug messages.
6. Call method startMonitor() to start the periodic measurements.

• Measurement interval is set to 60000 milliseconds. To change the interval open the file LYWSD03MMCSensor.js and change the value of the variable measurementInterval