const int nrLeds = 5; 
const int ledPins[] = { 2, 3, 4, 5,6}; 
const int analogInPin = 0; 
const int wait = 30; 
const boolean LED_ON = HIGH; 
const boolean LED_OFF = LOW; 
int sensorValue = 0; 
int ledLevel = 0; 
void setup() {
  for (int led = 0; led < nrLeds; led++)
  {
    pinMode(ledPins[led], OUTPUT); 
  }
}
void loop() {
  sensorValue = analogRead(analogInPin); 
  ledLevel = map(sensorValue, 0, 1023, 0, nrLeds); 
  for (int led = 0; led < nrLeds; led++)
  {
    if (led < ledLevel ) {
      digitalWrite(ledPins[led], LED_ON); 
    }
    else {
      digitalWrite(ledPins[led], LED_OFF); 
    }
  }
}