Micro:Mate Mini Expansion Board


The Micro:Mate is a tiny micro:bit I/O expansion board for learning electronics and building DIY projects.

Micro:Mate expands 6 sets of 3-pin I/O interfaces, capable of connecting DFRobot Gravity series modules, servo motors,sensors and jumper wires. Additionally, Pin 8, 12, 16 support voltage switch between 3V-5V, allowing up to 5V 2A digital (PWM) output.

Micro:Mate is in the same dimension of micro:bit. It connects to micro:bit through contact pins (with spring loaded), ensuring easy, compact and secure connection. The rubber bumpers and the 3.5mm audio jack on the back side keep the expansion installed stably on the board, meanwhile prevents reversed connection.

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

Project 1: OBLOQ-IoT Module +Micro:bit IoT Flower Watering

Hardware list:  

  • One bottle and part of tube 
  • Gravity: UART OBLOQ – IOT Module (Microsoft Azure) 
  • Micro:bit
  • 9g Metal Gear Micro Servo (1.8Kg) 
  • Gravity: Analog Capacitive Soil Moisture Sensor- Corrosion Resistant 

Project 2: Microbit Projects: Yes/No Bear

There are 2 possible answers. Either yes or no. We randomly generate the outcome when a button is pressed. When the answer is yes, the display will show Y & the tilt servo will response. When no, the display will show N and pan servo will response. 
Hardware list:
  • 2 x 9G servo motor 
  • 1 x micro:bit 
  • 1 x Pan tilt kit 
  • 1 x stuffed toy bear 

Project 3: Micro:bit car with DFRobot gamepad

Hardware list:
  • Acrylic car chassis with 3 wheels (kit) 
  • L9110 Dual Channel Motor Driver Module 
  • micro:bits x 2 
  • micro:gamepad 
  • Double sided tape to stick the battery holder to the acrylic 
  • Glue gun to immobilize the back wheel 
  • Dupont cables 

Project 4:  LED writing board (micro:bit compatible)

The LED writing board is created using a photo frame that is surrounded with LED strip lights. When button A is pressed, the led strip turns white and flash. When button B is pressed, a random colour is generated. To off, press button A and B together.

Hardware list:

  • 1 x photo frame
  • RGB individually addressable LED strip (neo pixels)
  • 1 x microbit 

Microbit Project 5: Basketball score counter

  • Part needed
  • 1 x IR sensor
  • 1 x micro:bit
  • 1 X Gravity: Digital Speaker Module
  • Dupont cables



  • Color-coded Gravity 3-Pin interface, compatible with hundreds of plug&play electronic modules
  • 3-way analog input; 6-way digital input/output (PWM); 3V/5V jumper switch; 3.5mm audio jack
  • External Micro USB power port, up to 5V 2A power output.
  • Well-designed component lay-out and silk-screen. Reversed connection protection.


  • Interface: 6 x Gravity 3Pin
  • Operating Voltage: 5V/3.3V
  • Input Power: <10W
  • Measuring Range: 0-3.3V (Analog), 0-5V (Digital):
  • Dimension:68.5 * 53.3mm/ 2.7 * 2.1 inches
  • Weight:22.8g


    Product wiki
    More Documents


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