int STBY = 5; //standby

//Motor A
int PWMA = 3; //Speed control 
int AIN1 = 2; //Direction
int AIN2 = 4; //Direction

//Motor B
int PWMB = 6; //Speed control
int BIN1 = 7; //Direction
int BIN2 = 8; //Direction

void setup(){
  pinMode(STBY, OUTPUT);

  pinMode(PWMA, OUTPUT);
  pinMode(AIN1, OUTPUT);
  pinMode(AIN2, OUTPUT);

  pinMode(PWMB, OUTPUT);
  pinMode(BIN1, OUTPUT);
  pinMode(BIN2, OUTPUT);
}

void loop(){


   move(1,255, 1);
   move(2,255, 1);

  delay(1000); //go for 1 second

  stop();
  
   delay(200);
   
   move(1,255, 1);
   move(2,100, 1);

  delay(1000); //go for 1 second


  stop();

  delay(400);

  move(1,255, 2);
   move(2,255, 2);

  delay(1000);

   stop();

    delay(1000);

}


void move(int motor, int speed, int direction){
//Move specific motor at speed and direction
//motor: 0 for B 1 for A
//speed: 0 is off, and 255 is full speed
//direction: 0 clockwise, 1 counter-clockwise

  digitalWrite(STBY, HIGH); //disable standby

  boolean inPin1 = LOW;
  boolean inPin2 = HIGH;

  if(direction == 1){
    inPin1 = HIGH;
    inPin2 = LOW;
  }

  if(motor == 1){
    digitalWrite(AIN1, inPin1);
    digitalWrite(AIN2, inPin2);
    analogWrite(PWMA, speed);
  }else{
    digitalWrite(BIN1, inPin1);
    digitalWrite(BIN2, inPin2);
    analogWrite(PWMB, speed);
  }
}

void stop(){
//enable standby  
  digitalWrite(STBY, LOW); 
}