micro:Mate - a Mini & Thin Expansion Board for micro:bit (Gravity Compatible)

micro:Mate micro:bit I/O expansion board delivers a compact interface solution for electronics learning and rapid prototyping. Designed with the same footprint as the micro:bit, this compact controller expansion exposes six Gravity‑style 3‑pin ports for direct connection with DFRobot modules and common robotics hardware. The miniature development accessory supports plug‑and‑play integration with servo motors, sensors, and jumper wires. A built‑in voltage‑switch design on selected pins enables both 3.3V logic and higher‑power 5V digital control, making this tiny expansion board suitable for classroom experiments, robotics prototypes, and interactive hardware projects.

Note: The mounting screws should be well tightened to ensure a secured connection. micro:Mate supports only 3V (3.3V) analog input from Pin 0, Pin 1, and Pin 2. The Micro USB power port on the expansion board provides power only and cannot be used for data transmission. Components with large power consumption should be connected to Pin 8, Pin 12, or Pin 16 with a 5V power supply.

Gravity 3‑Pin Plug‑and‑Play Connectivity

This microcontroller expansion module integrates six color‑coded Gravity 3‑pin ports, simplifying wiring for electronic modules and actuator devices. Each connector follows the widely adopted signal‑power‑ground layout used across the Gravity ecosystem, enabling fast integration without breadboards or complex wiring. Educational electronics projects benefit from quick sensor and actuator attachment, while robotics prototypes gain reliable connections for motion control, environmental sensing, and signal input. The layout supports both analog inputs and digital PWM outputs, expanding the capabilities of microcontroller‑based experimentation platforms.

Selectable 3.3V / 5V Output for High‑Power Components

Pins 8, 12, and 16 include a voltage selection jumper allowing switching between 3V and 5V logic levels. This flexible power configuration enables reliable PWM control for motors, lighting modules, and other digital peripherals requiring higher voltage. With support for up to 5V 2A output through the external Micro USB power input, the electronics expansion accessory supports demanding hardware such as servo‑driven mechanisms or robotics motion systems while maintaining compatibility with standard low‑voltage logic circuits.

Compact Mechanical Design with Secure Contact Connection

The miniature I/O expansion board matches the exact dimensions of the microcontroller platform, forming a clean stacked structure when installed. Spring‑loaded contact pins provide a stable electrical connection while maintaining quick installation and removal. Rubber bumpers and a rear 3.5mm audio jack help stabilize mounting and prevent reverse installation. Carefully arranged components and clear silk‑screen labeling further improve usability during electronics assembly, making the compact hardware interface suitable for classrooms, workshops, and portable embedded projects.

Compact size, simple wiring, and Gravity module compatibility make this educational electronics expansion ideal for robotics experiments, sensor‑based automation, and STEM Education activities. Makers, students, and educators gain a reliable hardware interface for building interactive systems such as smart gadgets, motion‑controlled robots, environmental monitoring projects, and creative coding demonstrations using a microcontroller learning platform.