GPIO expansion board for micro:bit in T shape

IIC port: The IIC interface operates independently. IIC components such as OLED, BME280, LCD1602, etc., can be connected. Multi-functional: It can be connected to various sensors to create many interesting projects. Users can use programming to achieve what they want. Voltage output: 3.3V - 5V, more stable voltage output. Provides more convenience for external units with different voltages.