ELECFREAKS micro:bit Robit - DIY Mini Smart Cars Robot Development Platform Chassis

SKU: EF03413
$25.90 USD
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Robit is a motherboard of a smart car based on micro:bit. It is compatible with MBOT. Except for the integration of the simple and convenient RJ25 connector, motor connector, and sensor on MBOT, we have extended 4 DC motor connectors, and 2 stepping motor connectors(same with 4 DC motor connectors), 8 PWM signal output connectors on this board. You can use it to drive PWM signal driving devices like a servo. It has 8 G-5V-S digital signal connectors(for connecting with OCTOPUS electric bricks). Robit can realize all the current basic functions of MBOT. Besides, you can extend its usage with more sensors, motors, servos, stepping motors, and so on.



Compatible with MBOT chassis and sensors.
Support 4 channels of DC motor and 2 channels of stepping motors.
With 8 PWM signal output connectors.
With 8 G-5V-S digital signal connectors(for OCTOPUS electric brick).
With 4 G-5V-S analog signal connectors(for OCTOPUS electric brick).
Integrate frequently used modules like a buzzer, rainbow LED, light sensor, infrared send, and receive.


RJ25 Connector

Robit has 4 RJ25 connectors. Each RJ25 connector has 6 touch points. These points respond to power, 2 IO ports, and IIC ports separately. It is compatible with some sensors on mBOT.

GVS Standard Electric Brick Connector

Except leading out to the RJ25 connector, the IO port on micro:bit also leads out with the format of GVS. It supports 5V components. Besides, P1/P2/P3/P4 support 5V analog input sensors.

GVS Standard Servo Connector: S0~S7

You can connect 8 servos at most. This connector leads out from the chip PCA9685 and extends from the IIC connector on micro:bit instead of normal I/O ports.

DC Motor Connector: M1~M4

It allows you to connect 4 DC motors (max) at the same time. This connector leads out from the chip PCA9685 and extends from the IIC connector on micro:bit instead of normal I/O ports.

Stepping Motor Connector: STEP 1 & STEP 2

It enables you to connect 2 stepping motors(28BYJ-48-5V) at most.


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Light Sensor

The light sensor on board is connected to the P10 port on micro:bit.

Infrared Emitting Diode

This infrared emitting diode is connected to the P6 port on micro:bit.

Infrared Receiving Diode

This infrared receiving diode is connected to the P8 port on micro:bit.

Rainbow LED

Two rainbows LED beads are connected to the P12 port on micro:bit.

DC Power Connector

DC power connector supports 3.7V~4.2V DC power. It is usually connected to a battery holder with 4 AAA batteries.

Li-battery Connector

Li-battery connector supports 3.7V~4.2V li-battery.

Li-battery Indicator

This indicator tells you battery power information. It is in blinking status. Blink once means 1 grid of power. And the full power has 4 grids. That means it will blink 4 times when the battery power is full.

USB Connector

This connector is only used to charge the li-battery. It doesn't support data transmission and its charging current is 500mA.

Pins & Connectors

RJ25 Connector

Match Pins on micro:bit






SCL(P19)/SDA(P20)/GND/5V/P1/P2 (support 5V analog input sensor)


SCL(P19)/SDA(P20)/GND/5V/P3/P4 (support 5V analog input sensor)

Quick Start

Hardware Connection
Fix robit onto mbot car.
Connect left motor to M1 port and right motor to M2 port.
Once completed, it looks like the following picture showed.



Click to open makecode, search the keyword "robit" and add robit package.


Write your code to make the car forever move forth and back for 3 seconds respectively. Here's the code:

You can see the whole program from the link
Or you can download it from the page below.


We can see our robit car moves forward for 3 seconds, and then backward for 3 seconds. This round-trip movement is repeated forever.





DC Power Input Voltage

DC 3.7-6V

Li-battery Input Voltage

DC 3.7-4.2V

USB Recharging Current


Extendable Analog IO Ports


Extendable Digital IO Ports


Max Stepping Motor Driven Quantity


DC Motor

4 Channels

Stepping Motor

2 Channels

Programmable LED Beads


Passive Buzzer 


Photocell Sensor


Infrared Receive


Infrared Send



90mm X 74mm

Net Weight



Package List






robit Smart Car kit

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