#define LED1 22
 #define LED2 2
 #define LED3 26
 #define LED4 25  
 int num;
 void rightturn();
 void leftturn();
 void forward();
 void backward();

 void setup()
 {
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
  pinMode(LED4, OUTPUT);
  Serial.begin(115200);
  }
 void loop()
 {
   if (Serial.available())
   {
   int num=Serial.read();
    Serial.println(num);

   if(num=='1')
     rightturn();
   else if(num=='2')
     leftturn();
   else if(num=='3')
     forward();
   else if(num=='4')
     backward();
 }
 }
  void rightturn()
    {
    digitalWrite(LED1, LOW);
    digitalWrite(LED2, LOW);
    digitalWrite(LED3, HIGH);
    digitalWrite(LED4, HIGH);
    }
   
void leftturn()
  {
    digitalWrite(LED1, HIGH);
    digitalWrite(LED2, HIGH);
    digitalWrite(LED3, LOW);
    digitalWrite(LED4, LOW);
  }
   
void forward()
  {
    digitalWrite(LED1, HIGH);
    digitalWrite(LED2, HIGH);
    digitalWrite(LED3, HIGH);
    digitalWrite(LED4, HIGH);  
  }
  
void backward()
  {
    digitalWrite(LED1, HIGH);
    digitalWrite(LED2, HIGH);
    digitalWrite(LED3, HIGH);
    digitalWrite(LED4, HIGH);
  }