int lid1 = 13;
int lid2 = 12;
int lid3 = 11;
int lid4 = 10;
char state = 0;
int flag = 0;

void setup() {
   Serial.begin(9600);
   
pinMode(lid1, OUTPUT);
pinMode(lid2, OUTPUT);
pinMode(lid3, OUTPUT);
pinMode(lid4, OUTPUT);
digitalWrite(lid1, LOW);
digitalWrite(lid2, LOW);
digitalWrite(lid3, LOW);
digitalWrite(lid4, LOW);

}

void loop() {
  // put your main code here, to run repeatedly:



  if(Serial.available() > 0){
    state = Serial.read();
    flag = 0;

  }

  if(state == 'a' ){
    digitalWrite(lid1, HIGH);
    if(flag == 0 ){
      Serial.println("Turn ON ");
      flag =1;
    }
  }

  else if(state == 'b' ){
    digitalWrite(lid1, LOW);
    if(flag == 0 ){
      Serial.println("Turn OFF ");
      flag =1;
    }
 
  }

  else if(state == 's' ){
    digitalWrite(lid2, HIGH);
  
    if(flag == 0 ){
      Serial.println("Turn All ON ");
      flag =1;
    }
  }

  else if(state == 'd' ){
   
    digitalWrite(lid2, LOW);
    
    if(flag == 0 ){
      Serial.println("Turn All OFF ");
      flag =1;
    }

  }


}