Using millis() instead of delay

Projects Programming
4

'static' just means that it keeps its value even when the function it is defined in exits. Every caller to the function will be using the same instance of the variable.

I just tried it on an Arduino UNO with:

void loop(){
  //blink the LED on pin 13 every 500 ms forever...
  timer(500, blinking);
  //fade an LED on pin 9 forever...
  timer(30, fading);
}

For reasons I explained above the LED on pin 13 never blinked.