The Micro:bit expansion board we developed makes it easier to use the Micro:bit. It is used to insert Micro:bit. It not only brings out the pins of Micro:bit, but also adds power and more. Resources. With this expansion board, we can apply Micro:bit more quickly to more creative projects. It include RGB light, ultrasonic sensor interface, motor interface, buzzer, color sensor interface, output power interface, sound sensor,8 channel servo interface, line-tracking sensor interface.