Since the advent of micro:bit, its simple and practical way of programming is widely loved by makers,
students and teachers. Its sample design, coupled with a wealth of pin resources, give it infinite
possibilities. This expansion board not only leads to 9 micro: bit onboard GPIO interfaces, but also
comes with 4-way motor drives and 8 servo interfaces, of which 4-way motor drives can be reused
as 2-way stepper motor drives.
Micro:bit Driver Expansion Board adopts IIC external drive chip to control the motor and servo motor,
only takes up two IIC pins and can complete the motor and servo dual control without occupying
other resources. Using HR8833 motor driver, the maximum continuous operating current is 1.5A, it
can drive the ordinary small motor and N20 mini metal motor. Each motor port comes with a positive
and negative rotating indicator to identify the motor running direction conveniently, which is very
suitable for students and makers to make small projects. Both the extended GPIO and the servo
interface use the DFRobot _ Gravity standard interface, supporting a large number of modules and
sensors. The servo interface is directly connected to the Vin power supply, thus increasing the
supply current which can support multiple servos to work at the same time.
This expansion board supports 3.5V to 5.5V power supply. It provides a DC 2.1 plug and a wiring
terminal which can be connected directly to three dry battery boxes. It comes with a USB to DC 2.1
adapter cable, which can be powered by power bank and is more economical and environment-
friendly.
Specification
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Supply Voltage: 3.5~5.5V DC
Digital Output Voltage: 0V / 3.3V
Analog Output Voltage: 0~3.3V DC
Standard Gravity Interface
Micro: bit Interface: 9 (P0 P1 P2 P8 P12 P13 P14 P15 P16)
Servo Interfaces x 8
Motor Interface: DC Motor x 4 / Step Motor x 2
Dimension: 63x58mm / 2.48x2.28in
Board Overview
Micro:bit Driver Expansion Board DFR0548 Board Overview
Tutorial
MakeCode Tutorial
Graphical block software library: https://github.com/DFRobot/pxt-motor
Drive Motor
Drive Motor1
Result:
The motor M1 and M2 rotate in positive direction at a speed of 150 for 2 seconds, then
reverse for 2 seconds, in endless loop.
Drive Motor2
Result:
When the button A is pressed, M1 rotates forward and M2 stops; when the button B is
pressed, M2 rotates forward and M1 stops; when both button A and button B are pressed at the
same time, all motors stop.
Drive Servo
Drive Servo
Result:
When the A is pressed, set the angle of servo to 180°, when the B is pressed, set the angle
of servo to 0°.
Drive Stepper Motor
Drive Drive Stepper Motor1
Result:
When turned on, the stepper motor rotates clockwise 180°, then rotate counterclockwise
180°, in endless loop.
Drive Drive Stepper Motor2
Result:
When turned on, the stepper motor rotates clockwise for 2 turns, then rotates
counterclockwise for 2 turns, in endless loop.
FAQ
For any questions, advice or cool ideas to share, please visit the
DFRobot Forum.
More Documents
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Hardware Design Resource
https://www.dfrobot.com/wiki/index.php/Micro:bit_Driver_Expansion_Board_SKU:DFR0548#More_Documents 7-16-18
PCB Design
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