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Description
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.
Dimension
Features
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.
Buzzer
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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.
|
RJ25 Connector |
Match Pins on 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) |
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 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.
Results
We can see our robit car moves forward for 3 seconds, and then backward for 3 seconds. This round-trip movement is repeated forever.
Parameters
|
Item |
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 |
Package List
|
Components |
Qty(pcs) |
|
Robit |
1 |
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