Blink without "delay()" - stepping up.

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2

That kind of mostly uncommented code does not help the newbies.

Please add more to this

// Have we completed the interval?
char timeout(long *marker, long interval) {
  if (millis() - *marker >= interval) { 
    *marker += interval; 
    return true;       
  } 
  else return false;
}

and this

if (timeout(&count1, 500)) {