int analogInPin = A0;
int sensorValue = 0;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  for(int i = 2; i < 6; i ++) {
    pinMode(i, OUTPUT);
  }
}

void loop() {
  // put your main code here, to run repeatedly:
  sensorValue = analogRead(analogInPin);



  if(sensorValue >= 0 && sensorValue < 256) {
    for(int i = 2; i < 6; i ++) {
      digitalWrite(i, LOW);
    }
  }
  else if (sensorValue >= 256 && sensorValue < 512) {
    digitalWrite(2, HIGH);
    for(int i = 3; i < 6; i ++) {
      digitalWrite(i, LOW);
    }
  }

  else if (sensorValue >= 512 && sensorValue < 768) {
    digitalWrite(2, HIGH);
    digitalWrite(3, HIGH);
    digitalWrite(4, LOW);
    digitalWrite(5, LOW);
  }

  else if (sensorValue >= 768 && sensorValue < 1000) {
        for(int i = 2; i < 5; i ++) {
        digitalWrite(i, HIGH);
    }
    digitalWrite(6, LOW);
  }

  else {
    for(int i = 2; i < 6; i ++) {
      digitalWrite(i, HIGH);
    }
  }

  Serial.print("sensor = ");
  Serial.println(sensorValue);

}