const int AnalogIN = A0;
const int LED_number = 10;

int LED[] = {
  2,3,4,5,6,7,8,9,10,11
};

void setup() {
  // put your setup code here, to run once:
  for (int ThisLED = 0; ThisLED<LED_number; ThisLED++)
  {
    pinMode(LED[ThisLED],OUTPUT);
  }
}

void loop() {
  // put your main code here, to run repeatedly:
  int SensorReading = analogRead(AnalogIN);
  int LED_Level = map(SensorReading, 0, 1023, 0, LED_number);

  for (int ThisLED = 0; ThisLED<LED_number; ThisLED++)
  {
    if (ThisLED < LED_Level)
    {
      digitalWrite(LED[ThisLED], HIGH);
    }
    else
    {
      digitalWrite(LED[ThisLED], LOW);
    }
  }
 
}