const int LDR_PIN = A0;
const int LED_COUNT = 8;
int ledPins[] = {2, 3, 4, 5, 6, 7, 8, 9};

void setup() {
  // put your setup code here, to run once:
  for(int i=0; i<LED_COUNT; i++){
    pinMode(ledPins[i], OUTPUT);
  }
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  int sensorValue = analogRead(LDR_PIN);
  int brightness = map(sensorValue, 0 , 1015, 0, LED_COUNT);
  for(int i=0; i<LED_COUNT; i++){
    if(i<brightness){
      digitalWrite(ledPins[i], HIGH);
    } else {
      digitalWrite(ledPins[i], LOW);
    }
  }
  Serial.println(sensorValue);
  delay(100);
}