//simple example for how to use object oriented programming in arduino

#define LED_PIN 13 // define the pin, the led is connected to

class Led { // add new class 
  private: // only accessable within the class
    byte _pin; //attribut for class "Led", the pin a LED is connected to
    bool _ledState = LOW;
    unsigned int _previousMillis = 0;
    unsigned int _myTime;

  public: // accessable outside of the class
    Led(){} //default constructor, so do not use
    Led(byte pin){ //define a constructor
      _pin = pin; //set the pin of the led to the pin number, the constructor is called with
    }

  void init(){ // set the pinmode of the pin, the constructor is called with
    pinMode(_pin, OUTPUT);
  }

  void init(byte defaultState){ // define a methode to set the LED in some default State
    init(); // call the first init() function to set the pinmode
    if (defaultState == HIGH){ on();} // set default state by calling the on()/off() function
    else{off();}
  }

  void on(){ // turn on the pin the constructor is called with
    digitalWrite(_pin, HIGH);
  }

  void off(){ //turn off the pin, the constructor is called with
    digitalWrite(_pin, LOW);
  }

  void blink(int ON_TIME, int OFF_TIME){
    unsigned int currentMillis = millis();
    if ((currentMillis - _previousMillis >= OFF_TIME) && (_ledState == LOW)) {
      _previousMillis = currentMillis;
      _ledState = HIGH;
      digitalWrite(_pin, HIGH);
    }

    if((currentMillis - _previousMillis >= ON_TIME) && (_ledState == HIGH)){
      _previousMillis = currentMillis;
      digitalWrite(_pin, LOW);
      _ledState = LOW;
    }
  }
};

Led led13(LED_PIN); //create a new object by calling the constructor of the class Led, now pin = 13, 

void setup() {
  Serial.begin(9600);
  led13.init(HIGH); // initialize a default high state
  delay(500); 
  Serial.println("LED 13 is initialized");
  delay(2000);
}

void loop() {
  led13.blink(500,2000); 
}