Compatible With: BBC micro:bit Accessory Type: Expansion Board 5V 1A power supply for enhanced driving capability 3.3V and 5V power interface Supports 3.3V and 5V sensor modules All micro:bit pins extended 3.5mm audio connector 5 gold-plated contact fingers Built-in buzzer with on/off toggle switch LEGO-compatible mounting holes Color-coded yellow and black 3-pin interface 5V 1A self-resetting fuse Color: Black Material: ABS Dimensions: 56 × 44 × 12 mm Package Contents: 1 × Expansion Board Note: 1. When powering via micro:bit, the 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 can be driven, but total current must not exceed 1A. 3. When using pin input functions (e.g., digital read), 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 activate or IO readings may be inaccurate. 5. Pins shared with the micro:bit LED matrix (e.g., P3, P4, P5, P6, P7, P8, P9, P10, P11) require disabling the matrix display in software before use. 6. Pins P19 and P20 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 mounting on conductive metal surfaces to prevent short circuits. This package includes only the expansion board. All other items shown are for illustration only. Note: Color appearance may vary slightly due to lighting conditions and screen settings. Dimensions are subject to a tolerance of ±1–3 mm.