Arduino_IntervalWithoutDelay.ino

/*
 * Encapsulate the logic of running something on an interval in a simple class which returns a boolean

 * Usage:
 *  // Create a global variable to keep the state
 *  IntervalWithoutDelay operationName = new IntervalWithoutDelay(1000);
 *  IntervalWithoutDelay slowerOperation = new IntervalWithoutDelay(5000);
 *  
 *  void loop(void) {
 *    unsigned long currentMillis = millis();
 * 
 *    if (operationName.RunNow(currentMillis)) {
 *
 *      // My operation which should run approximately once per second
 *
 *    }
 *    if (slowerOperation.RunNow(currentMillis)) {
 *
 *      // My operation which should run approximately once per 5 seconds
 *
 *    }
 *  }
*/


class IntervalWithoutDelay {
    unsigned long _updateRate;
    unsigned long _previousMillis;
  public:
    IntervalWithoutDelay (unsigned long updateRate)
    {
      _updateRate = updateRate;
    }
    bool RunNow(unsigned long currentMillis)
    {
        if ((currentMillis - _previousMillis) >= _updateRate)
        {
            _previousMillis = currentMillis;
            return true;
        }
        return false;
    }
};