Xiaomi Mijia UART Adapter Board

This compact adapter board simplifies the process of flashing multiple devices by using three pogo pins to connect to the necessary contacts. Simply solder once, and let the pogo pins do the rest.

You'll need three pogo pins for this build. I used these: https://www.amazon.de/dp/B07WP196KW

The alternative Zigbee firmware for the Xiaomi LYWSD03MMC Bluetooth temperature and humidity sensor is available here: https://github.com/devbis/z03mmc

For added flexibility, I've included the FreeCAD file, so you can easily adjust the design if you’re using different pins.