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Motor Shield V1.0

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Contents

Introduction

The Motor Shield is a perfect platform for robotics and mechanical applications. It enables the Arduino to drive two brushed DC motors or one 4-wire two-phase stepper motor. Based on the H-bridge driver Chip L298N motor driver integrated circuit, it requires a 6V to 15V power supply to power the motor and also includes an on-board 5V voltage regulator for powering the main Arduino board. Additional plug and play Grove sensors can be connected to the 13 on-board Grove connectors.


Model: SLD80256P

Smotoshield2.jpg

Features

  • Standard Arduino compatible
  • Pulse-width modulated speed control mode
  • 4 direction indicator lights
  • Compatible with Grove plug and play sensors
  • Extra large heat sink helps handle big loads
  • Supports up to 14 servos

CAUTION:
The Driver IC and Heat sink may become very hot when working with current more than 1000mA.

Specifications

Item Min Typical Max Unit
Logic Control Voltage 4.5 5 5.5 V
Motor Supply Voltage 6 / 15 V
Output Voltage 0 / Vinput -1 V
Output Current( For Each Channel) / / 2000 * mA
Output Duty range 0%~100% /
Dimension 68.5x54.5x29.5 mm
Net Weight 37 g

* Recommend maximum duty <50% at full load

Interface Function

Motor shield-hard3.jpg
External Power Jack: External Power supply for Motor Shield.
Motor Interface:Out 1 and Out 2(Out 3 and Out 4) can connect Motor A(B) for DC Motor.
Enable Motor A Connector:Connect above two interfaces with a jumper cap when driving the DC motor A.
Enable Motor B Connector:Connect below two interfaces with a jumper cap when driving the DC motor B.
Supply Power Select Connector: USB/Extern Power can supply for driving the Motor. When connect the connector using a jumper cap, the USB power for the motor shieled.
The following table describes Motor A/B indicator LEDs.

Indicators Description
IN1_red lights when motor A turns clockwise, out1 pin outputs high level
IN2_green lights when motor A turns counterclockwise, out2 pin outputs high level
IN3_red lights when motor B turns clockwise, out3 pin outputs high level
IN4_green lights when motor B turns counterclockwise, out4 pin outputs high level


Pin Name Direction Connection to Arduino Description
VCC / VCC Power supply selector
VS, GND / / Power Supply for Motor, 6V - 15V
EA Input D9 TTL Compatible Enable Input of Bridge A
EB Input D10 TTL Compatible Enable Input of Bridge B
IN1 Input D8 TTL Compatible Inputs of the Bridge A
IN2 Input D11 TTL Compatible Inputs of the Bridge A
IN3 Input D12 TTL Compatible Inputs of the Bridge B
IN4 Input D13 TTL Compatible Inputs of the Bridge B
M1-, M1+ Output / Outputs of the Bridge A
M2-, M2+ Output / Outputs of the Bridge B

Usage

Hardware Installation

Connect DC motor to the motor shield Output Pins M1+& M1-(M2+& M2-), if using a 4-wire stepper motor, make sure the 4 Pins are correctly connected. Connect the drive voltage (The required voltage depends upon the motor used. Refer to the motor datasheet) to the Power supply terminals.
Motor-basic.jpg
With the jumper J4 inserted, Arduino can be powered by the drive voltage via an on-board voltage regulator, which regulates the drive voltage to 5v.

Software

Download the Motor shield Demo code and open the Motor_shield_demo_code sketch. Select the corresponding Arduino board in tools-boards and serial port in tools-serial port.
Motor shield.jpg
Upload the sketch to your arduino board, then you would found the 2 motors begin to work. If you power the motor shield via the power terminal and the power jumper J4 was inserted, you can remove the USB cable now.
Speed control is achieved through conventional PWM which can be obtained from Arduino's PWM output D9(EA) and D10(EB). Using the function analogWrite() to generate the drive PWM:

int speedpinA=9;//enable motor A
int speedpinB=10;//enable motor B
int speed =127;//define the speed of motor
    ......
analogWrite(speedpinA,speed);//AnalogWrite to Generate PWM to control the motor speed
analogWrite(speedpinB,speed);

And Set the Digital D8(IN1) and D11(IN2) to control the motor attached to OUT1/2, while digital D12(IN3) and D13(IN4) to control motor attached to OUT3/4.

int pinI1=8;//define I1 interface
int pinI2=11;//define I2 interface 
    ......
digitalWrite(pinI2,HIGH);//turn DC Motor A move clockwise
digitalWrite(pinI1,LOW);

Follows the logic between EA(B) and INx with motor motion:

EA(B) IN1(IN3) IN2(IN4) Motion of MotorA(B)
0 x x Stop
1 0 0 Stop
1 0 1 Clockwise
1 1 0 Anticlockwise
1 1 1 Stop
/*
 SEEED Studio Stepper Motor Control - one revolution
 
 Adapts the Stepper example for use with the SEEED STUDIO motor shield.
 This program drives a unipolar or bipolar stepper motor
 by using the included Stepper library of the Arduino.
 The motor is attached to the Seeed Studio motor shield and an Arduino.
 
 The digital pins 8,11,12,13 drive the L298N and are used when creating the stepper object
 Digital pins 9 and 10 must be high to enable the chip.
 
 The motor should revolves one revolution in one direction, then
 one revolution in the other direction. 
 
 
 Created 11 Mar. 2007
 Modified 30 Nov. 2009
 by Tom Igoe
 Modified 4 July 2012
 By R. Dumouchelle
 
 */
 
#include <Stepper.h>
 
const int stepsPerRevolution = 200;  // change this to fit the number of steps per revolution
// for your motor
 
// initialize the stepper library on pins 8 through 11:
Stepper myStepper(stepsPerRevolution, 8,11,12,13);           
 
void setup() {
  // set the speed at 60 rpm:
  myStepper.setSpeed(60);
  // initialize the serial port:
  Serial.begin(9600);
  pinMode(9,OUTPUT);
  pinMode(10,OUTPUT);
  digitalWrite(9,HIGH);
  digitalWrite(10,HIGH);
}
 
void loop() {
  // step one revolution  in one direction:
  Serial.println("clockwise");
  myStepper.step(stepsPerRevolution);
  delay(500);
 
step one revolution in the other direction:
  Serial.println("counterclockwise");
  myStepper.step(-stepsPerRevolution);
  delay(500);
}

Version Tracker

Revision Descriptions Release
v1.0 V1.0 Release 2012/3/29

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