Bluetooth Controlled Car with Camera

//youtube.com/lighttubes//
//poncolhijau.web.id//

int val;
int IN4 = 11; 
int IN3 = 10;
int IN2 = 9;
int IN1 = 8;
int LED = 13;

void setup()
{
  Serial.begin(9600);
  pinMode (IN4, OUTPUT);
  pinMode (IN3, OUTPUT);
  pinMode (IN2, OUTPUT);
  pinMode (IN1, OUTPUT);
  pinMode (LED, OUTPUT);
}

void loop()
{
if (Serial.available())
  {   
     val = Serial.read();
     if (val == 'U') //forward no stop
        {
        digitalWrite (IN1, HIGH);
        digitalWrite (IN2, LOW); 
        digitalWrite (IN3, HIGH);
        digitalWrite (IN4, LOW);         
        }     
     if (val == 'D') //backward no stop
        {
        digitalWrite (IN1, LOW);
        digitalWrite (IN2, HIGH); 
        digitalWrite (IN3, LOW);
        digitalWrite (IN4, HIGH);         
        }
     if (val == 'A') //forward
        {
        digitalWrite (IN1, HIGH);
        digitalWrite (IN2, LOW); 
        digitalWrite (IN3, HIGH);
        digitalWrite (IN4, LOW);         
        }
     if ( val == 'B') //backward
        {
         digitalWrite (IN1, LOW); 
         digitalWrite (IN2, HIGH);
         digitalWrite (IN3, LOW); 
         digitalWrite (IN4, HIGH);
        }
     if ( val == 'R') //TURN RIGHT
        {
         digitalWrite (IN1, LOW); 
         digitalWrite (IN2, HIGH);
         digitalWrite (IN3, HIGH); 
         digitalWrite (IN4, LOW);
        }
     if ( val == 'L') //TURN LEFT
        {
         digitalWrite (IN1, HIGH); 
         digitalWrite (IN2, LOW);
         digitalWrite (IN3, LOW); 
         digitalWrite (IN4, HIGH);
        }
      if ( val == 'X') //led ON
    {
         digitalWrite (LED, HIGH); 
        }  
      if ( val == 'Y') //led OFF
    {
         digitalWrite (LED, LOW); 
        }  
      if ( val == 'S') //stop
    {
         stop();
        }  
  }
}

void stop()
        {
         digitalWrite (IN1, LOW); 
         digitalWrite (IN2, LOW);
         digitalWrite (IN3, LOW); 
         digitalWrite (IN4, LOW);
        }