const int ledCount = 10;

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

int val = 0;

void setup() {
  Serial.begin(115200);
  Serial.println("เริ่ม");
  for (int thisLed = 0; thisLed < ledCount; thisLed++) {
    pinMode(ledPins[thisLed], OUTPUT);
  }
}

void loop() {
  val = analogRead(A0);
  val = map(val, 0, 1023, 0, 100);

  int ledLevel = map(val, 0, 100, 0, ledCount);

  for (int thisLed = 0; thisLed < ledCount; thisLed++) {
    if (thisLed < ledLevel) {
      digitalWrite(ledPins[thisLed], HIGH);
    }
    else {
      digitalWrite(ledPins[thisLed], LOW);
    }
  }
  Serial.print("val: ");
  Serial.print(val);
  Serial.print("%\tLED Level: ");
  Serial.println(ledLevel);

  delay(10);
}