void setup() {
  // put your setup code here, to run once:

  pinMode(5,OUTPUT);
  pinMode(6,OUTPUT);
  pinMode(7,OUTPUT);
  pinMode(3,INPUT);
 
  digitalWrite(7,HIGH);
  delay(100);
  digitalWrite(7,LOW);
  digitalWrite(5,HIGH);
  delay(100);
  digitalWrite(5,LOW);

}

void loop() {

  int sensorValue = analogRead(A0);

  if (sensorValue > 256) {
    digitalWrite(7,HIGH);
  } else {
    digitalWrite(7,LOW);
  }

  if (sensorValue > 512) {
    digitalWrite(5,HIGH);
  } else {
    digitalWrite(5,LOW);
  }

  if (sensorValue > 768) {
    digitalWrite(6,HIGH);
  } else {
    digitalWrite(6,LOW);
  }

  }