/*
  Program LED Bar Graph Di Ambil Dari
  https://www.arduino.cc/en/Tutorial/BuiltInExamples/BarGraph
*/

// variabel constant yang tidak berubah:
int potPin = A0;   // pin potentiometer
int ledCount = 10;    // jumlah led
int buttonPin = 13; // button pin

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

// debounce delay untuk menunggu program di jalankan ketika buttonstate berubah
int debounceDelay = 50;
int lastTimeButtonStateChanged = 0;
int lastButtonState = LOW;
bool LEDOn = false;

void setup() {
  // looping pin array untuk dimasukan ke output
  for (int thisLed = 0; thisLed < ledCount; thisLed++) {
    pinMode(ledPins[thisLed], OUTPUT);
  }
  pinMode(buttonPin, INPUT);
}

void loop() {
  int timeNow = millis();
  if (timeNow - lastTimeButtonStateChanged > debounceDelay) {
    int buttonState = digitalRead(buttonPin);
    if (buttonState != lastButtonState) {
      lastTimeButtonStateChanged = timeNow;
      lastButtonState = buttonState;
      if (buttonState == LOW) { // button di tekan
        LEDOn = !LEDOn;
      }
    }
  }
  
  if (LEDOn) {
      int potValue = analogRead(potPin);
      // map hasil input dari potentiometer ke jumlah led
      int ledLevel = map(potValue, 0, 1023, 0, ledCount);

      // looping array pin led lagi
      for (int thisLed = 0; thisLed < ledCount; thisLed++) {

        if (thisLed < ledLevel) {
        digitalWrite(ledPins[thisLed], HIGH);
        }

        else {
        digitalWrite(ledPins[thisLed], LOW);
        }
      }
  }
  else {
    for (int thisLed = 0; thisLed < ledCount; thisLed++) {
      digitalWrite(ledPins[thisLed], LOW);
    }
  }
}