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 that leads to 19 pin pins of the Microbit board. 2. Each pin pin is assigned VCC and GND. You can switch VCC freely 3.3V or jumper cap. 5V; with 3 3V3 and 5V pins, the wiring is more flexible and diverse; 4. With integrated passive, connected via jumper cap 5. Power supply method includes DC head and USB socket power supply.
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