Compatible With: BBC micro:bit Accessory Type: Extension Board 5V 1A power supply for enhanced driving capability 3.3V and 5V power interface Supports 3V/5V sensor modules All micro:bit pins extended 3.5mm audio connector 5 gold finger connectors Built-in buzzer with toggle switch LEGO-compatible mounting holes Color-coded yellow and black 3-pin interface 5V 1A self-recovering fuse Color: Black Material: ABS Dimensions: 56 x 44 x 12 mm Package Contents: 1 x Expansion Board Note: 1. When powering via micro:bit, IO port current must remain below 200 mA. Do not connect high-current devices (e.g., large servos or DC motors), as this may damage the micro:bit. 2. When using an external 5V power supply, multiple small servos may be driven, but total current must not exceed 1A. 3. When using pin read functions (high/low), ensure internal pull-down resistors are enabled. 4. If P0 is used as a general-purpose IO pin, the buzzer switch must be set to OFF; otherwise, the buzzer may sound or IO readings may be inaccurate. 5. Pins shared with the micro:bit LED matrix (e.g., 3, 4, 5, 6, 7, 8, 9, 10, 11) require disabling the LED matrix in software before use. 6. Pins 19 and 20 are reserved for I2C communication only and cannot be used as general-purpose IO. 7. The USB port supports a maximum input current of 1A. 8. Avoid placing the board directly on conductive metal surfaces to prevent short circuits. This package includes only the listed item. Additional accessories are not included. Note: Color appearance may vary slightly due to lighting conditions and screen calibration. Dimensional tolerance: ±1–3 mm.