class Led {
//Light Emitting Diode class
  public:                                 //Public methods
    Led(int pin);                         //Constructor to create an LED object. The LED is connected to the specified pin.
    void on();                            //Method to turn on the LED
    void off();                           //Method to turn off the LED
    void flash(int onTime, int offTime);  //Method to flash the LED on and of for the specified times in milliseconds
  private:                                //Private methods
    int _pin;                             //The DIO pin is connected to the anode of the LED. The cathode of the LED is connected to ground. 
};

Led::Led(int pin) {
  //Constructor to create an LED object. The LED is connected to the specified pin.
  _pin = pin;                             //Save the DIO pin
  pinMode(_pin, OUTPUT);                  //Configure the DIO pin as an output
  off();                                  //Turn off the LED intially
}

void Led::on() {
  //Method to turn on the LED
  digitalWrite(_pin, HIGH);               //Turn on the LED by setting the DIO pin high
}

void Led::off() {
  //Method to turn off the LED
  digitalWrite(_pin, LOW);                //Turn Off the LED by setting the DIO pin low
}

void Led::flash(int onTime, int offTime) {
  //Method to flash the LED on and off for the specified times in milliseconds
  on();                                   //Turn on the LED
  delay(onTime);                          //Wait for the on time
  off();                                  //Turn off the LED
  delay(offTime);                         //Wait for the off time
}

Led rxLED(17);                            //Create an LED object and assign pin 17 (the Pro Micro RX pin) to it

// This setup function runs once when you press reset or power up the board
void setup() {
  //Nothing to set up
}

// This loop function runs continuously after set up
void loop() {
  rxLED.flash(100,100);                 //Flash the LED on for 100 mS and off for 100 mS
}