#include <math.h>

class Led
{
  // Class Variables
  int Ledpin; // The pin to control the LED
  int State; // The state of the LED
  unsigned long PrevMillis; // Last time the LED was updated
  long ONPeriod; // How long the LED will be ON
  long OFFPeriod; // How long the LED will be OFF

  // Class Constructors
  public:
  Led(int pin, long on, long off)
  {
    Ledpin = pin;
    ONPeriod = on;
    OFFPeriod = off;

    // Variables that needs to be passed by refrence
    State = LOW;
    PrevMillis = 0;
  }

  // Class Methods
  void Update()
  {
    // Initialize time
    unsigned long currentMillis = millis();

    if ((State == HIGH) && ((currentMillis - PrevMillis) >= ONPeriod)){
      PrevMillis = currentMillis;
      State = LOW;
    }else if ((State == LOW) && ((currentMillis - PrevMillis) >= OFFPeriod)){
      PrevMillis = currentMillis;
      State = HIGH;
    }
    digitalWrite(Ledpin, State);
  }
};

Led led1(2, 1000, 500);
Led led2(3, 500, 1000);

void setup() {
}

void loop() {
led1.Update();
led2.Update();
}