const int analogPin = A0; 
const int ledCount = 10; 
int ledPins[] = {2, 3, 4, 5, 6, 7, 8, 9, 10 , 11};

void setup() {
     Serial.begin(9600);
   for (int thisLed = 0; thisLed < ledCount; thisLed++) {
      pinMode(ledPins[thisLed], OUTPUT);
    }
}

void loop() {
   int sensorReading = analogRead(analogPin);
   float voltage = sensorReading * (5.0 / 1023.0);
   int ledLevel = map(sensorReading, 0, 1023, 0, ledCount);
   Serial.println(sensorReading);
   Serial.println(ledLevel);
   for (int thisLed = 0; thisLed < ledCount; thisLed++) {
      if (thisLed < ledLevel) {
         digitalWrite(ledPins[thisLed], HIGH);
      }else { 
         digitalWrite(ledPins[thisLed], LOW);
      }
   }
}