/*
  Blink Onboard LED every second (toggles every 500ms)
*/

void setup() {

  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT);
}

void loop() {
  digitalWrite(LED_BUILTIN, HIGH);  // turn the LED ON - voltage level 3.3V
  delay(500);                       // wait for 500 milliseconds
  digitalWrite(LED_BUILTIN, LOW);   // turn the LED OFF - voltage level 0V
  delay(500);                       // wait for 500 milliseconds
}