Need help with the logic in code to pulse a light on button press

Projects Programming
4

Here is some code that toggles a LED.

it does not use delay( ).

Can you figure out how the fragment works ?


void loop()
{
  //*************************************                          h e a r t b e a t   T I M E R
  //to see if the sketch is blocking,
  //toggle the heartbeat LED every 500ms
  if (millis() - heartbeatMillis >= 500)
  {
    //restart the TIMER
    heartbeatMillis = millis();

    //toggle the LED
    digitalWrite(heartbeatLED, !digitalRead(heartbeatLED));
  }
}
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