Motor Shield V2.0

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Motorshield 01.jpg

The Motor Shield is a driver module for motors that allows you to use Arduino to control the working speed and direction of the motor. Based on the Dual Full-Bridge Drive Chip L298, it is able to drive two DC motors or a step motor. The Motor Shield can either be powered directly by Arduino or by an external 6V~15V power supply via the terminal input. This module can be used for the development of micro robots and intelligent vehicles, etc


Get One Now Banner.png


Contents


Features

  • Standard Arduino UNO Shield pin out
  • Based on L298 full bridge IC
  • Drive 2 DC Motor or 1 Stepper
  • External power input available
  • Led indicator
  • Heat sink for better performance
  • Arduino library


Specifications

Spec Value
Operating Voltage 5V
External Power 6-15V
Output Current 2.0A Max @ Each Channel
PWM Range 0-100%
Output 2 Channels, 4 Ports


Hardware Overivew

MotorShieldHardware.png

1. Channel 1 indicator, include 3 leds

  • EB - channel 1 enable, high active
  • IN3 - status of OUT3
  • IN4 - status of OUT4

2. Channel 1 Sense - Please connect the left 2 pins together for normal usage.

Note that it's a high level application for sense the current, please refer to datasheet and schematic for more information.

3. OUTPUT - There're 2 channels, each channel has 2 output

  • Channel 0 - OUT1, OUT2
  • Channel 1 - OUT3, OUT4

4. Channel 0 Sense

5. Channel 0 indicator, include 3 leds

  • EB - channel 0 enable, high active
  • IN1 - status of OUT1
  • IN2 - status of OUT2

6. External Power Input, range 6-15V

7. Reset indicator - turn red when Reset button is pressed

8. Reset button - pressed to reset the shield and Arduino

9. Power indicator - turn green when power in, either internal or external

A. Power switch

  • Connect - Get power from Arduino
  • Disconnect - Get power from External sources

B. Standard Arduino shield pin out


Digital Pin Used

Arduino Pin Function
D0 Not Used
D1 Not Used
D2 Not Used
D3 Not Used
D4 Not Used
D5 Not Used
D6 Not Used
D7 Not Used
D8 OUT1
D9 Enable of Channel0
D10 Enable of Chennel1
D11 OUT2
D12 OUT3
D13 OUT4

Note that D8~D13 was used by Motor Shield. Please don't use those pins to avoid conflict.

Analog Pin Used

Arduino Pin Function
A0 Not Used
A1 Not Used
A2 Not Used
A3 Not Used
A4 Not Used
A5 Not Used

Note that Not Used means you can use those pins freely.

Getting Started

Here we will show you how to drive a dc motor and a stepper with this shield.

We need a Seeeduino V4 as the controller, Seeeduino V4 is an Arduino compatible board, and you can use an Arduino as well.

And you need a dc motor or a stepper for testing.

Download the library

Click the below button to download the library. If the library you had download include "-master", please remove it.


Motor shield v2 library.png

Drive a DC Motor

You can drive 2 DC motor with this shield. Here I will show you how to drive a DC motor.

Electric motor cycle 2.png

You need to do some preparing first:

  • Set SEN_A and SEN_B, connect the left 2 pins together with a jumper.
  • Connect MB_EN together with a jumper, as we are no going use an external power.
  • Connect your DC motor to Chanel 0 (OUT1 and OUT2).

Then open motor_dc example in the library. Upload the code to Seeeduino V4.2.

//  Demo function:The application method to drive the DC motor.
//  Author:Loovee (luweicong@seeed.cc)
//  2016-3-11
 
#include "MotorDriver.h"
 
MotorDriver motor;
 
void setup()
{
    // initialize
    motor.begin();
}
 
void loop()
{
    motor.speed(0, 100);            // set motor0 to speed 100
    delay(1000);
    motor.brake(0);                 // brake
    delay(1000);
    motor.speed(0, -100);           // set motor0 to speed -100
    delay(1000);
    motor.stop(0);                  // stop
    delay(1000);
}
// END FILE

Then you will find your motor move (1s), stop (1s), move back (1s), stop (1s), and loop.

If there's nothing happen, please make sure:

  • You had uploaded the code successfully
  • Your motor connect right
  • The led indicators blink right


Drive a Stepper

You can drive a 4-wire stepper with this shield. Here I will show you how to drive a stepper.

StepperMotor.gif

You need to do some preparing first:

  • Set SEN_A and SEN_B, connect the left 2 pins together with a jumper.
  • Connect MB_EN together with a jumper, as we are no going to use an external power.

Find the pin definitions of you stepper, and connect it to the OUTPUT of the shield. As below:

Stepper Motor Shield
A+ OUT1
A- OUT2
B+ OUT3
B- OUT4

Then open stepper_test example in the library, upload it to Seeeduino V4, then you will find your stepper move.

/*
 * Stepper test for Seeed Motor Shield V2
 * loovee @ 15 Mar, 2016
 */
 
#include <Stepper.h>
 
// change this to the number of steps on your motor
#define STEPS 200
 
// create an instance of the stepper class, specifying
// the number of steps of the motor and the pins it's
// attached to
Stepper stepper(STEPS, 8, 11, 12, 13);
 
// the previous reading from the analog input
int previous = 0;
 
void step(int steps)
{
    digitalWrite(9, HIGH);
    digitalWrite(10, HIGH);
    stepper.step(steps);
    digitalWrite(9, LOW);
    digitalWrite(10, LOW);
}
 
void setup()
{
    // set the speed of the motor to 30 RPMs
    pinMode(9, OUTPUT);
    pinMode(10, OUTPUT);
    digitalWrite(9, LOW);
    digitalWrite(10, LOW);
    stepper.setSpeed(30);
}
 
void loop()
{
    step(1000);
    step(-1000);
}
 
// END FILE

If there's nothing happen, please double check if you had connected the wire right.


Library APIs

begin

Description

Initialize the IOs, should be called at the very beginning of the code(maybe Setup()).

void begin();

speed

Description

Set speed, control by PWM.

void move(int motor_id, int speed);
  • motor_id
  • 0 - Chanel 0
  • 1 - Chanel 1
  • speed: -100~100, the larger the faster, 0 for stop

stop

void stop(unsigned char motor_id);

brake

void brake(unsigned char motor_id);

Stepper

Note that we use the library provided by Arduino IDE to drive a stepper.

There's something need to be modified, please refer the examples.


Resources



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