arduino_l293d_dc_motor_driver.ino

int enablePin = 11;
int in1Pin = 10;
int in2Pin = 9;
boolean dir = false;
int speed = 255;

void setup()
{
    pinMode(in1Pin, OUTPUT);
    pinMode(in2Pin, OUTPUT);
    pinMode(enablePin, OUTPUT);
}


void loop()
{    
    dir = ! dir;
    setMotor(speed, dir);
    delay(5000);
}


void setMotor(int speed, boolean direct)
{
    analogWrite(enablePin, speed);
    digitalWrite(in1Pin, ! direct);
    digitalWrite(in2Pin, direct);
}