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P3(LED Col3)，P4(LED Col1)，P5(Button A)，P6(LED Col4)，
Occupied
P7(LED Col2)，P10(LED Col5)，P11(Button B)
Browse the official website for more details:
https://tech.microbit.org/hardware/edgeconnector/
https://microbit.org/guide/hardware/pins/
( 4 )Notes for the application of Micro:bit main board
a. It is recommended to cover it with a silicone protector to prevent short
circuit for it has a lot of sophisticated electronic components.
b. Its IO port is very weak in driving since it can merely handle current less
than 300mA. Therefore, do not connect it with devices operating in large
current, such as servo MG995 and DC motor or it will get burnt.
Furthermore, you must figure out the current requirements of the devices
before you use them and it is generally recommended to use the board
together with a Micro:bit shield.
c. It is recommended to power the main board via the USB interface or via
the battery of 3V. The IO port of this board is 3V, so it does not support
sensors of 5V. If you need to connect sensors of 5 V, a Micro: Bit expansion
board is required.
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