void setup() {
  // put your setup code here, to run once:
  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(10, OUTPUT);
  Serial.begin(9600);
}

int a;

void loop() {
  // put your main code here, to run repeatedly:
  a = analogRead(A5);
  Serial.println(a);
  if(a<255){
    digitalWrite(10,HIGH);
    digitalWrite(11,LOW);
    digitalWrite(12,LOW);
    digitalWrite(13,LOW);
  }
  
  else if(a<512){
    digitalWrite(10,HIGH);
    digitalWrite(11,HIGH);
    digitalWrite(12,LOW);
    digitalWrite(13,LOW);
  }

  else if(a<768){
    digitalWrite(10,HIGH);
    digitalWrite(11,HIGH);
    digitalWrite(12,HIGH);
    digitalWrite(13,LOW);
  }

  else{
    digitalWrite(10,HIGH);
    digitalWrite(11,HIGH);
    digitalWrite(12,HIGH);
    digitalWrite(13,HIGH);
  }
}