class LED{
  private:
  unsigned int _pin;//_=private
  //min_pin = LED_BUILTIN;//在setup中设置ledP
  public:
  LED(){};//构造函数
  ~LED(){};//析构函数
  void attach(unsigned int pin){
      _pin = pin;
      //pinMode(_pin, OUTPUT);  
      }
    
  };

   byte getPin()const{
      return _pin;
  };

  void on(){
    digitalWrite(_pin, HIGH);
  };

  void off(){
    digitalWrite(_pin, LOW);
  };
  void toggle(){
    digitalWrite(_pin, !digitalRead(_pin));
  };

};

 LED myled1;//对象实例化
 LED myled2;
 LED myled3;
 LED myledErr0;

void setup() {
  //Serial.begin(115200);
  //Serial.println(" Begining-Serial Monitoring");
  myled1.attach(41);
  myled2.attach(12);
  myled3.attach(11);
  myledErr0.attach(2);
}

void loop() {
  //*****************
  myled1.on();
  myled2.on();
  myled3.on();
  delay(200);

  myled1.off();
  myled2.off();
  myled3.off();
  delay(200);

  myled1.toggle();
  myled2.toggle();
  myled3.toggle();
  delay(1000);
  
  
  myled1.toggle();
  myled2.toggle();
  myled3.toggle();
  delay(2000);
  /**************/
  myledErr0.toggle();
  delay(1000);
}