int pot = A0;
int lb = 3;
int lg = 4;
int ly = 5;
int lr = 6;

void setup() {
  for(int i = 3; i <= 6; i++){
    pinMode(i, OUTPUT);
  }
}

void loop() {
  int value = analogRead(pot);
  int val = map(value,0,1023,0,100);
  if(val <= 25){
    digitalWrite(lb, HIGH);
    digitalWrite(lg, LOW);
    digitalWrite(ly, LOW);
    digitalWrite(lr, LOW);

  }
  else if(val > 25 && val <= 50){
    digitalWrite(lb, HIGH);
    digitalWrite(lg, HIGH);
    digitalWrite(ly, LOW);
    digitalWrite(lr, LOW);  
  }
  else if(val > 50 && val <= 75){
    digitalWrite(lb, HIGH);
    digitalWrite(lg, HIGH);
    digitalWrite(ly, HIGH);
    digitalWrite(lr, LOW);  
  }
  else if(val > 75 && val <= 100){
    digitalWrite(lb, HIGH);
    digitalWrite(lg, HIGH);
    digitalWrite(ly, HIGH);
    digitalWrite(lr, HIGH);  
  }
  else if(val == 0){
    digitalWrite(lb, LOW);
    digitalWrite(lg, LOW);
    digitalWrite(ly, LOW);
    digitalWrite(lr, LOW);  
  }
  else{
    digitalWrite(lb, LOW);
    digitalWrite(lg, LOW);
    digitalWrite(ly, LOW);
    digitalWrite(lr, LOW);  
  }
}