const int potPin = A0;     
const int numLEDs = 10;    
const int ledPins[] = {2, 3, 4, 5, 6, 7, 8, 9, 10, 11}; 
int potValue;               
int ledLevel;               

void setup() {
  for (int i = 0; i < numLEDs; i++) {
    pinMode(ledPins[i], OUTPUT);
  }
}

void loop() {
  potValue = analogRead(potPin);   
  ledLevel = map(potValue, 0, 1023, 0, numLEDs);

 
  for (int i = 0; i < numLEDs; i++) {
    if (i < ledLevel) {
      digitalWrite(ledPins[i], HIGH); 
    } else {
      digitalWrite(ledPins[i], LOW);  
    }
  }
}