DC_Motor2.ino

//www.elegoo.com
//2016.12.12

/************************
Exercise the motor using
the L293D chip
************************/

#define ENABLE 5
#define DIRA 3
#define DIRB 4

int i;
 
void setup() {
  //---set pin direction
  pinMode(ENABLE,OUTPUT);
  pinMode(DIRA,OUTPUT);
  pinMode(DIRB,OUTPUT);
  Serial.begin(9600);
}

void loop() {
  Serial.println("Start The Motors!");
  //---PWM example, full speed then slow

  for (i=255;i>100;i--) {
  digitalWrite(DIRA,HIGH); //one way
  digitalWrite(DIRB,LOW);
  analogWrite(ENABLE,i); //enable on
  delay(200);
  }
  for (i=100;i<255;i++) {
  digitalWrite(DIRA,HIGH); //one way
  digitalWrite(DIRB,LOW);
  analogWrite(ENABLE,i); //enable on
  delay(200);  
  }
  /*
  analogWrite(ENABLE,255); //enable on
  digitalWrite(DIRA,HIGH); //one way
  digitalWrite(DIRB,LOW);
  delay(2000);
  analogWrite(ENABLE,180); //half speed
  delay(2000);
  analogWrite(ENABLE,128); //half speed
  delay(2000);
  analogWrite(ENABLE,50); //half speed
  delay(2000);
  analogWrite(ENABLE,128); //half speed
  delay(2000);
  analogWrite(ENABLE,180); //half speed
  delay(2000);
  analogWrite(ENABLE,255); //half speed
  delay(2000);
  digitalWrite(ENABLE,LOW); //all done
  delay(10000);
  */
}