void setup() {
  Serial.begin(9600);
  Serial.println("*** This message will only be displayed on start or reset. ***");
  delay(2000);
}

void loop() {
  Serial.println("-- Arduino now at top of main loop. --");
  Serial.println("--------------------------------------");
  delay(2000); // warte 2000 Millisekunden = 2 Sekunden
  Serial.println("Executing instructions in main loop.");
  delay(2000); // warte 2000 Millisekunden = 2 Sekunden
  Serial.println("Arduino now at bottom of main loop.\r\n");
}