Example Code for Arduino-Motor Control

Wiring Diagram

Sample Code

/*!
  * file motor.ino
  * brief Show Show The motor turns clockwise or counterclockwise.
  * Copyright  [DFRobot](https://www.dfrobot.com)
  * Copyright GNU Lesser General Public License  *
  * @author [DongZi]([email protected])
  * version  V1.0
  * date  2017-07-05
  */

void setup() {
pinMode(4,OUTPUT);   /* define  pin (4,5,6,7) out*/
pinMode(5,OUTPUT);
pinMode(6,OUTPUT);
pinMode(7,OUTPUT);
}
void motor_c(char motor_n,char direction_m,int speed_m ) /* motor_n: the motor number to drive(0 stands for M1;1 stands for M2)*/
/* direction_m : the motor rotary direction(0 is clockwise and 1 is counter-clockwise).*/
/* speed_m: to control the motor rotation speed(from 0 to 255 ), the speed_m value is larger, the rotation speed is faster;*/
{  if(motor_n==1)
   {   if(direction_m==1)
        {digitalWrite(4,HIGH);    // pin 4 controls M2 rotary direction analogWrite(5,speed_m);  //pin 5 controls M2 rotation speed
        }
        else
        {digitalWrite(4,LOW);
         analogWrite(5,speed_m);
        }
    }
    else
    {
       if(direction_m==1)
        {digitalWrite(7,HIGH);  // pin 7 controls M1 rotary direction
         analogWrite(6,speed_m);//pin 6 controls M2 rotation speed
        }
        else
        {digitalWrite(7,LOW);
         analogWrite(6,speed_m);
        }
      }

  }
void loop() {
 motor_c( 0,0,127 );// M1 rotate in clockwise of 127 component velocity(total as 225)
 motor_c( 1,0,127 );// M1 rotate in clockwise of 127 component velocity(total as 225)
 delay(5000);        //delay for 5s
 motor_c( 0,1,200 );// M1 rotate in counter-clockwise of 200 component velocity(total as 225)
 motor_c( 1,1,200 );// M2 rotate in counter-clockwise of 200 component velocity(total as 225)
 delay(5000);      //delay for 5s
}

Result

The motor rotate slowly in clockwise for 5s and rotate quickly in counter-clockwise for 5s and goes on.

Additional Information