class Timer{
  public:
    Timer(){

    }
    void update(){
      if(hasStarted){
        now = millis();

        if(now - timeEllapsed >= 10){
          timeEllapsed = now;
          time += 10;
          Serial.println(time);
        }
      }
    }
    void start(){
      hasStarted = true;
    }
    void stop(){
      hasStarted = false;
    }
    unsigned long getTime(){
      return time;
    }
  private:
  unsigned long timeEllapsed;
  unsigned long time;
  unsigned long now;
  bool hasStarted = false;
};

Timer timer;

void setup() {
  Serial.begin(115200);
  timer.start();
}

void loop() {
  timer.update();

  if(timer.getTime() >= 2000){
    Serial.println("five seconds has passed");
    timer.stop();
  }
}