Product highlights and benefits Expands Microbit Board I/O to 19 pins, making it easy to connect multiple sensors, actuators, and modules. Flexible power selection: each pin has corresponding VCC and GND. VCC can be switched between 3.3V and 5V with a jumper cap, allowing modules that require either voltage to be used without additional wiring. Multiple power rails: includes three 3.3V and three 5V supply pins for simpler, neater wiring when connecting several devices. Built-in passive buzzer: provides audible output; connected and enabled via a jumper cap so it can be used only when needed. I2C-ready: SDA and SCL pins are provided along with matching 5V and GND pins to simplify connection of I2C modules such as the LCD1602 display. Key features (concise) Breakout for 19 Microbit Board pins for easy access to IO. Individual VCC and GND available at each pin. Jumper-selectable VCC (3.3V or 5V). Multiple 3.3V and 5V pins for flexible wiring. On-board passive buzzer (connectable via jumper). SDA and SCL with corresponding power and ground for I2C peripherals. Why you need this board Simplifies prototyping and classroom projects by making all Microbit pins accessible and powering them appropriately. Eliminates confusion when combining 3.3V and 5V modules by allowing per-board power selection with a jumper. Reduces wiring complexity when connecting multiple devices by providing extra power pins and clear pin breakout. Typical use scenarios Connecting an LCD1602 or other I2C displays and sensors using the SDA/SCL pins and the provided 5V/GND rails. Building sensor arrays or robotics projects that require multiple I/O connections and both 3.3V and 5V supply options. Adding simple audible feedback (alarms, tones, notifications) to a Microbit project using the on-board passive buzzer. Compatibility and function Designed for use with the Microbit Board; breaks out 19 pins from the Microbit for easy external connections. Power selection via jumper cap allows compatibility with modules that need 3.3V or 5V. SDA and SCL pins facilitate I2C communication with devices like the LCD1602. Contents and usage notes Board provides multiple VCC and GND points paired with each IO pin. Use the jumper cap to select VCC level (3.3V or 5V) as required by your connected modules. Connect the passive buzzer with its jumper cap when audible output is required. Use the SDA and SCL lines and their corresponding power/GND pins to connect I2C modules. This board streamlines wiring, improves flexibility for mixed-voltage projects, and adds basic audio and I2C connectivity while exposing 19 Microbit pins for development and experimentation.