Robit is a motherboard for a micro:bit based smart car.
It is compatible with MBOT. With most of the features of MBOT, with the addition of 4 DC motor connectors, 2 stepper motor connectors and 8 PWM signal output. You can use it to drive PWM signal devices like servos. It has 8x G-5V-S digital signal connectors. Robit can gives you all the basic functions of MBOT. Additionally, you can extend its features with more sensors, motors, servos, stepping motors, etc.
Features
- Compatible with MBOT chassis and sensors.
- Support 4 channels of DC motor and 2 channels of stepping motors.
- 8 PWM signal output connectors.
- 8 G-5V-S digital signal connectors.
- 4 G-5V-S analog signal connectors.
- Integrate frequently used modules like buzzer, rainbow LED, light sensor, infrared send and receive.
Pins & Connectors
Introduction of Major Components
RJ25 Connector
Robit has 4 RJ25 connectors. Each RJ25 connector has 6 touch points. These points respond to power, 2 IO ports and I2C ports separately. It is compatible with some sensors on mBOT.
| RJ25 Connector | Pin mapping to micro:bit |
| J1 | SCL(P19)/SDA(P20)/GND/5V/P13/P14 |
| J2 | SCL(P19)/SDA(P20)/GND/5V/P15/P16 |
| J3 | SCL(P19)/SDA(P20)/GND/5V/P1/P2 (support 5V analog input sensor) |
| J4 | SCL(P19)/SDA(P20)/GND/5V/P3/P4 (support 5V analog input sensor) |
GVS Standard Electric Brick Connector
In addition to the RJ25 connector, the I/O port on the micro:bit also interfaces with 5V components. P1/P2/P3/P4 supports 5V analog input sensors.
GVS Standard Servo Connector: S0~S7
You can connect 8 servos in total. This connector leads out from the chip PCA9685 and extends from the I2C 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 I2C connector on micro:bit instead of normal I/O ports.
Stepping Motor Connector: STEP1 & STEP2
It enables you to connect (max) 2 stepping motors (28BYJ-48-5V).
Buzzer
The buzzer is connected to the P0 port on micro:bit.
Light Sensor
The light sensor onboard 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 rainbow 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 with status blinks. 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 li-battery. It doesn’t support data transmit and its charging current is 500mA.
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.
Programming
Click to open makecode, search the key word “robit” and add robit package.
Write your code to make the car in the forever block
to move forth and back for 3 seconds. Here’s the code:
You can see the whole program from the link here:https://makecode.microbit.org/_aXVAyx3dm585
Also, you can download the code directly from the page below:
Results
We can see our robit car moves forward for 3 seconds, and then backward 3 seconds. This round trip movement is repeated forever.
Parameter
| Project | Parameter |
| DC Power Input Voltage | DC 3.7-6V |
| Li-battery Input Voltage | DC 3.7-4.2V |
| USB Recharging Current | 500mA |
| Extendable Analog IO Ports | 4 |
| Extendable Digital IO Ports | 10 |
| Max Stepping Motor Driven Quantity | 8 |
| DC Motor | 4 Channels |
| Stepping Motor | 2 Channels |
| Programmable LED Beads | 2 |
| Passive Buzzer | Support |
| Photocell Sensor | Support |
| Infrared Receive | Support |
| Infrared Send | Support |
| Dimension | 90mm X 74mm |
| Net Weight | 46g |
Dimensions
Packing List
1 x Robit
Documents
Robit User Guide
Measure Distance
Avoid Obstacle
Line Tracking
Run Around
Reversing Alarm
Colorful Light
Smart Car Light
Fast Shipping with Professional Packaging
Due to our longstanding partnership with UPS FedEx DHL as well as other major international carriers, we are able to provide a range of shipping options. Our warehouse staff is highly trained to package your goods exactly according to the specifications we provide. Your items will go through a thorough examination and will be safely packaged prior to being sent out. We deliver to thousands of customers every day from all over the world. The fact that we are determined to become the largest online retailer in the world is obvious. Warehouses and distribution centres can be located in Europe as well as in the USA.
It is important to note that orders with multiple items are subject to a processing period that is based to the particular item.
Prior to shipping, our team will perform an extensive inspection of the products you have ordered. Most orders today are shipped in 48 hours. The expected delivery time will be between 3 and 7 days.
Returns
Due to the multiple parties involved such as the factory and the warehouse, we cannot completely manage our stock. The actual levels of stock can change at any moment. It's possible that you may not receive your order once the order has been made.
Our policy is for 30 days. If 30 days have gone without a trace since the purchase however, we're unable to give you a return or exchange.
You are able to return a product in the event that it is not used and still in the same state as when you first received it. The item must be returned in its original packaging.
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