#define  pot A0
int leds[] = {2, 3, 4, 5, 6, 7, 8, 9, 10, 11};
int numleds = sizeof(leds) / sizeof(leds[0]);


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

}

void loop() {

int Vleds = (analogRead(pot));
int Nleds = map(Vleds, 0, 1023, 1, numleds);

for (int i = 0;i < numleds; i++) {
  if (i < Nleds) {
    digitalWrite(leds[i], HIGH);
  } else { digitalWrite(leds[i], LOW);
  
  }

 }
delay(50);
}