The micro:IO Extender is a compact expansion board for the BBC micro:bit that breaks out all 19 I/O pins as Gravity-compatible 3-pin headers. It provides plug-and-play access to the full range of micro:bit GPIO, along with dedicated I2C and serial port headers, an onboard buzzer with switch, and edge connector contacts.

Clear silkscreen labelling on the back indicates the function of every interface, making it easy to get started with external sensors, actuators, and displays.

Key Features

• 19 I/O Pins – All micro:bit pins broken out as Gravity-standard 3-pin headers
• Dedicated I2C Header – Independent I2C interface (P19, P20) for sensors and displays
• Serial Port Header – Dedicated UART interface (P13, P14)
• Onboard Buzzer – Connected to P0, with a physical switch to enable/disable
• Edge Connector Contacts – Retains micro:bit edge connector access
• ENIG Finish – Gold-plated pads for reliable connections

Specifications

• Operating Voltage – 3.3 V
• Dimensions – 45.5 × 66.5 mm (1.79 × 2.62 in)
• Interface – 19× I/O ports (Gravity 3-pin)

Resources

• Product Wiki – Board overview, pinout, and specifications