#define POT A0
void setup() {
  // put your setup code here, to run once:
  pinMode(POT, INPUT);
  for(int led=1; led < 11; led++)
  {
    pinMode(led, OUTPUT);
  }

}

void loop() {
  // put your main code here, to run repeatedly:
  int vp = analogRead(POT);
  int ledLevel = map(vp,0,1023,1,11);
  for (int led=1; led < 11; led++)
  {
    if(led<ledLevel) {
      digitalWrite(led,HIGH);
    }
    else if (led >= ledLevel){
      digitalWrite(led,LOW);
    }
  }
}