const int count = 10;
const int pinArr [] = {3,4,5,6,7,8,9,10,11,12};

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(A0, INPUT);
  int i =0;
  while(i<count){
    pinMode(pinArr[i], OUTPUT);
    Serial.println(pinArr[i]);
    i++;
  }
}

void loop() {
  // put your main code here, to run repeatedly:
  int i = 0;
  int val = analogRead(A0);
  int intent = map(val,0,1023,0,count);
  while(i<count){
    if(i<intent){
      digitalWrite(pinArr[i], HIGH);
    }else{
      digitalWrite(pinArr[i],LOW);
    }
    i++;
  }

}