Blink without "delay()" - stepping up.

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15

Instead of:

  // Act if the latter time (ms) has now passed on this particular counter,
  if (timeout(&count1, 500UL )) {
    if (led1State == LOW) {
      led1State = HIGH;
    }
    else {
      led1State = LOW; 
    } 
    digitalWrite(led1Pin, led1State);
  }

I'd use:

if (timeout(&count1, 500UL )) { //has the timing period ended?
 led1State = !led1State;//Invert Led1State, HIGH becomes LOW and LOW becomes HIGH.
 digitalWrite(led1Pin, led1State);//turn LED on or off, as defined by led1State.
  }

I'd also add an explanation that, although this code only blinks LEDs, the principle can be use to time anything.