The Micro:Driver Expansion Board is a versatile motor and servo driver board designed for micro:bit, UNIHIKER M10, and K10. Ideal for educational robotics and DIY smart projects, it provides 9 GPIO ports from the micro:bit plus 4 motor ports and 8 servo ports, allowing up to 2 stepper motors using multiplexing.
The board uses an I2C-based HR8833 motor driver, supporting a max current of 1.5A, powerful enough to drive N20 and small DC motors. It minimizes GPIO usage by requiring only 2 I2C pins, leaving other resources available for sensors and modules. The extended GPIO and servo headers follow the Gravity interface, ensuring compatibility with a wide range of DFRobot modules and sensors.
Key Features
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Compatible with micro:bit, UNIHIKER M10, K10, and similar controllers
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Supports 4 DC motors / 2 stepper motors (shared with motor interface)
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8 servo interfaces with 5V power supply
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Uses I2C communication – saves GPIO resources
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Built-in HR8833 motor driver, 1.5A continuous current
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Compatible with DFRobot Gravity sensors
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Works with educational programming tools (MakeCode, Mind+)
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USB to DC 2.1 power adapter included
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Supports 3.5V to 5.5V input via batteries or USB
Technical Specifications
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Power Input: 3.5V–5.5V
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Motor Driver Chip: HR8833
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Max Continuous Current: 1.5A
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Digital I/O Ports: 9 (from micro:bit)
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Servo Ports: 8 × 3-pin (standard)
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Motor Ports: 4 DC / 2 stepper (multiplexed)
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Communication: I2C
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Dimensions: 63 × 58 mm (2.48 × 2.28 in)
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Output Voltage: Digital 0V/3.3V, Analog 0–3.3V
Application Scenarios
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STEM and robotics classrooms
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Mini AI robots with UNIHIKER or micro:bit
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Multi-motor controlled vehicles or arms
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Interactive smart devices using Gravity sensors
Example Project
Ping Pong Ball Picker – HuskyLens AI Robotic Ball Picker
Build an autonomous robot to collect table tennis balls using the Micro:Driver, servo motors, and vision modules. Perfect for robotics challenges or AI education demos.
Shipping List
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1 × Micro:Driver Expansion Board
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1 × USB to DC2.1 Converter Cable