IO: bit expansion board is a powerful micro:bit expansion board, which leads to 19 PIN pins of the Micro:bit Board.
Each PIN pin has VCC and GND corresponding to it. You can freely switch VCC to 3.3V or jumper cap. 5V; with 3 independent 3V3 and 5V pins, the wiring is more flexible and diverse;
I2C SDA and SCL pins and the corresponding 5V and GND pins are provided for module
connections such as LCD1602 LCD display for I2C communication more possibilities;
With on-board passive buzzer, connected via jumper cap;
Power supply method includes DC head and USB socket power supply.