This is a GPIO expansion board for microbits.
1. Power indicator
Micro power supply, the indicator light will be red, without power it will not light up.
2.P0 Buzzer jump cover
By default, jumper cover ioit is plugged in. In Makecode, you can program using the music column, and make sounds. Usually, there is no sound when you turn it on.
3.3Pin IO port lead
All pins in the Microbit have been taken out without any reservations (PS: P17 and P18 are not on the microbit, and the IObit is not taken out)
4.40 P Microbit Horizontal Socket
5. Circuit board mounting holes and fixing holes
The outermost two holes are approximately 4.8mm in diameter, compatible with the 48mm spacing of LEGO friction pins
The innermost two holes are about 3.1mm in diameter and can be tightened with ordinary M3 screws. The spacing is about 32mm.