2.Each PIN pin has VCC and GND corresponding to it. You can freely switch VCC to 3.3V or jumper cap. 5V; with 3 3V3 and 5V pins, the wiring is more flexible and diverse; 3. SDA and SCL pins and the corresponding 5V and GND pins are provided for module connections such as LCD1602 LCD display for communication more possibilities; Features: 1.IO: bit expansion board is a powerful expansion board, which leads to 19 PIN pins of the Microbit Board. 4.With on-board passive buzzer, connected via jumper cap; 5.Power supply method includes DC head and USB socket power supply.
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