#define Motor1A  7
#define Motor1B  8
#define en1  6   //motor 1

#define Motor2A  10
#define Motor2B  12
#define en2  5   //motor 2

#define Motor3A  A5
#define Motor3B  A4
#define en3  11   //motor 2

#define Motor4A  A3
#define Motor4B  A2
#define en4  9   //motor 4


void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);

  //motor 1
  pinMode(Motor1A, OUTPUT);
  pinMode(Motor1B, OUTPUT);
  pinMode(en1, OUTPUT); 

  //motor 2
  pinMode(Motor2A, OUTPUT);
  pinMode(Motor2B, OUTPUT);
  pinMode(en2, OUTPUT); 

  //motor 3
  pinMode(Motor3A, OUTPUT);
  pinMode(Motor3B, OUTPUT);
  pinMode(en3, OUTPUT); 

    //motor 4
  pinMode(Motor4A, OUTPUT);
  pinMode(Motor4B, OUTPUT);
  pinMode(en4, OUTPUT); 


  pinMode(LED_BUILTIN, OUTPUT);
}

void loop() {

  digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(2000);                       // wait for a second


  if (Serial.available() > 0) { //read bytes when serial has more than two bytes availible
  /*  int X = Serial.read();
    delay(10);
    int X1 = (int) X;
    if (X1 == 1) {

    */
//forwards
      //motor 1
  digitalWrite(Motor1A, LOW);
  digitalWrite(Motor1B,   HIGH);
  analogWrite(en1, 0);


//motor 2
  digitalWrite(Motor2A, LOW);
  digitalWrite(Motor2B,   HIGH);
  analogWrite(en2, 0);

//motor 3
  digitalWrite(Motor3A, HIGH);
  digitalWrite(Motor3B,   LOW);
  analogWrite(en3, 175);


//motor 4
  digitalWrite(Motor4A, HIGH);
  digitalWrite(Motor4B,   LOW);
  analogWrite(en4, 175);

  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(2000); 

  //////////////////////
  ///back
        //motor 1
  digitalWrite(Motor1A, LOW);
  digitalWrite(Motor1B,   HIGH);
  analogWrite(en1, 0);


//motor 2
  digitalWrite(Motor2A, LOW);
  digitalWrite(Motor2B,   HIGH);
  analogWrite(en2, 0);

//motor 3
  digitalWrite(Motor3A, LOW);
  digitalWrite(Motor3B,   HIGH);
  analogWrite(en3, 175);


//motor 4
  digitalWrite(Motor4A, LOW);
  digitalWrite(Motor4B,   HIGH);
  analogWrite(en4, 175);

  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(2000); 


///////////////////////////part 2:

//left?

//motor 1
  digitalWrite(Motor1A, HIGH);
  digitalWrite(Motor1B,   LOW);
  analogWrite(en1, 175);


//motor 2
  digitalWrite(Motor2A, LOW);
  digitalWrite(Motor2B,   HIGH);
  analogWrite(en2, 175);

//motor 3
  digitalWrite(Motor3A, LOW);
  digitalWrite(Motor3B,   HIGH);
  analogWrite(en3, 0);


//motor 4
  digitalWrite(Motor4A, LOW);
  digitalWrite(Motor4B,   HIGH);
  analogWrite(en4, 0);

  delay(2000);

  //right

//motor 1
  digitalWrite(Motor1A, LOW);
  digitalWrite(Motor1B,   HIGH);
  analogWrite(en1, 175);


//motor 2
  digitalWrite(Motor2A, HIGH);
  digitalWrite(Motor2B,   LOW);
  analogWrite(en2, 175);

//motor 3
  digitalWrite(Motor3A, LOW);
  digitalWrite(Motor3B,   HIGH);
  analogWrite(en3, 0);


//motor 4
  digitalWrite(Motor4A, LOW);
  digitalWrite(Motor4B,   HIGH);
  analogWrite(en4, 0);

  delay(2000);

    }

  }