#define LED_hijau 13
#define LED_kuning 12
#define LED_merah 11
#define buttonPin 7

// constants won't change. They're used here to set pin numbers:
//const int buttonPin = 7;    // the number of the pushbutton pin
//const int ledPin = 13;      // the number of the LED pin

// Variables will change:
int ledState = 0;         // the current state of the output pin
int buttonState;             // the current reading from the input pin
int lastButtonState = LOW;   // the previous reading from the input pin

// the following variables are unsigned longs because the time, measured in
// milliseconds, will quickly become a bigger number than can be stored in an int.
unsigned long lastDebounceTime = 0;  // the last time the output pin was toggled
unsigned long debounceDelay = 50;    // the debounce time; increase if the output flickers

void setup() {
  // put your setup code here, to run once:
  pinMode(LED_hijau, OUTPUT);
  pinMode(buttonPin, INPUT);
  pinMode(LED_kuning, OUTPUT);
  pinMode(LED_merah, OUTPUT);
  digitalWrite(LED_hijau, LOW);
  digitalWrite(LED_kuning, LOW);
  digitalWrite(LED_merah, LOW);
}

void loop() {
  // put your main code here, to run repeatedly:

  // read the state of the switch into a local variable:
  int reading = digitalRead(buttonPin);

  // check to see if you just pressed the button
  // (i.e. the input went from LOW to HIGH), and you've waited long enough
  // since the last press to ignore any noise:

  // If the switch changed, due to noise or pressing:
  if (reading != lastButtonState) {
    // reset the debouncing timer
    lastDebounceTime = millis();
  }

  if ((millis() - lastDebounceTime) > debounceDelay) {
    // whatever the reading is at, it's been there for longer than the debounce
    // delay, so take it as the actual current state:

    // if the button state has changed:
    if (reading != buttonState) {
      buttonState = reading;

      // only toggle the LED if the new button state is HIGH
      if (buttonState == HIGH) {
        ledState++;
      }
    }
  }
  
  if (ledState == 1){
    digitalWrite(LED_merah, HIGH);
  }
  else if (ledState == 2){
    digitalWrite(LED_merah, LOW);
    digitalWrite(LED_kuning, HIGH);
  }
  else if (ledState == 3){
    digitalWrite(LED_kuning, LOW);
    digitalWrite(LED_hijau, HIGH);
  }
  else if (ledState == 4){
    ledState=1;
    digitalWrite(LED_hijau, LOW);
    digitalWrite(LED_merah, HIGH);
  }
  // save the reading. Next time through the loop, it'll be the lastButtonState:
  lastButtonState = reading;

}