Untitled

Performing a function after x time
unsigned long previousMillis = 0; // last time update
long interval = 2000; // interval at which to do something (milliseconds)

void setup(){
}

void loop(){
  unsigned long currentMillis = millis();

  if(currentMillis - previousMillis > interval) {
     previousMillis = currentMillis;

     // do something
  }
}

class Timer
{
public:
    Timer(void);
    void set_max_delay(unsigned long v);
    void set(void);
    boolean check(void);
private:
    unsigned long max_delay;
    unsigned long last_set;
};

Timer::Timer(void)
{
    max_delay = 3600000UL; // default 1 hour
}

void Timer::set_max_delay(unsigned long v)
{
    max_delay = v;
    set();
}

void Timer::set()
{
    last_set = millis();
}

boolean Timer::check()
{
    unsigned long now = millis();
    if (now - last_set > max_delay) {
        last_set = now;
        return true;
    }
    return false;
}

Timer timer;

void setup()
{
   timer.set_max_delay(60000); // 1 minute
}

void loop()
{
   boolean some_condition = false;
   if (some_condition) {
       timer.set();
   }
   if (timer.check()) {
      // nothing happened for a long time
   }
   delay(500);
}