class Hall{
  private:
    int led_pin, btn_pin;
  public:
    Hall(int led_pin, int btn_pin){
        DDRD |= (1<<led_pin);//pinMode(led_pin, OUTPUT);     Seta 1 em DDRD_BIT3 (saída)
        PORTD &= ~(1<<led_pin); //digitalWrite(led_pin,LOW); Seta 0 em PD3   (led off)

        DDRD &= ~(1<<btn_pin );//pinMode(btn_pin,INPUT_(...)) Seta 0 em DDRD_BIT2 (entrada)
        PORTD |= (1<<btn_pin);//INPUT_PULLUP                  Seta 1 em PD2 (habilita pullup)
        this->led_pin = led_pin;
        this->btn_pin = btn_pin;
    }
  void led_set(int s){
        (s==0)? (PORTD &= ~(1<<this->led_pin)):(PORTD |= (1<<this->led_pin));///if ternário
  }
  void led_invert(){
    PORTD ^= (1<<this->led_pin);//Inverter o estado do led

  }
  void ms(int ms){
    _delay_ms(ms);

  }

};



void setup() {
  Hall hall(3,2);
  for (;;){
    hall.led_invert();
    hall.ms(500);
    //hall.led_set(0);
    //hall.ms(500);

  }

  

}

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

}