multitasking.ino

// Defining the constants present in the code

unsigned long cycle = 300000;
unsigned long lastMillis = 0;

void setup(){}

void loop(){

   if(cycleCheck(&lastMillis, cycle))  {
   
     // faz o que você quer.
   

  }
}



// function for multitasking
// http://arduino.cc/forum/index.php/topic,5686.msg44073.html
 
boolean cycleCheck(unsigned long *lastMillis, unsigned long cycle) {
 
  unsigned long currentMillis = millis();
 
  if(currentMillis - *lastMillis >= cycle)  {
    *lastMillis = currentMillis;
    return true;
  }  
  else{
    return false;
  }
}