IO Bit Expansion Board for Micro:bit Key benefits Flexible power per pin: Each IO pin provides its own VCC and GND. VCC can be switched between 3.3V and 5V using a jumper, enabling easy compatibility with different sensors and modules. Expandable wiring options: Additional 3.3V and 5V pins are available to simplify wiring and improve layout for complex projects. Builtin audible alert: Onboard passive buzzer is available and can be connected via a jumper cap for simple sound signaling. Ready for I2C module connections: SDA and SCL pins are provided, along with their corresponding 5V and GND pins, enabling easy connections to I2C devices such as LCD displays (eg LCD1602) and other modules. Micro:bit IO expansion: Increases the Micro:bit board IO to 19 pins, enhancing project capability without sacrificing space or reliability. What it does Adds 19 pins to the Micro:bit board, each with independent VCC and GND access. Enables flexible voltage selection per pin (3.3V or 5V) via a simple jumper. Provides a dedicated buzzer connection for audible feedback. Supports I2C communication through SDA/SCL plus power and ground pins for compatible modules like LCD displays. Compatibility Designed for Micro:bit boards and compatible modules that use 3.3V or 5V logic levels. Suitable for projects requiring multiple IO lines, I2C peripherals, and audible alerts. Specifications and attributes Number of IO pins: 19 Perpin power: selectable VCC (3.3V or 5V) with corresponding GND Onboard buzzer: passive buzzer via jumper cap I2C support: SDA and SCL pins with matching 5V and GND connections Module connections: ready for LCD1602 displays and similar I2Cequipped modules Use scenarios Multisensor platform: Extend Micro:bit with multiple sensors (temperature, humidity, light, etc.) and drive a buzzer for alerts using the expanded IO and configurable voltages. I2C LCD display interface: Connect an LCD1602 via SDA/SCL to display realtime data from Micro:bit, with power supplied through the VCC options. Interactive control panel: Build a small control panel with several actuators and indicators (LEDs, switches, motors) using the 19 available pins and flexible voltage options. Notes The board focuses on function, compatibility, and reliability, providing a clear pathway to richer Micro:bit projects without unnecessary complexity.