void setup() {
  // zu Nutzende Pins definieren
  pinMode(9, OUTPUT);
}

void loop() {
  // SOS in Morsecode
  ///S "..."
  delay(1000);
  digitalWrite(9, HIGH);
  delay(300);
  digitalWrite(9, LOW);
  delay(300);
  digitalWrite(9, HIGH);
  delay(300);
  digitalWrite(9, LOW);
  delay(300);
  digitalWrite(9, HIGH);
  delay(300);
  digitalWrite(9, LOW);


  //O "_ _ _"
  delay(1000);
  digitalWrite(9, HIGH);
  delay(600);
  digitalWrite(9, LOW);
  delay(600);
  digitalWrite(9, HIGH);
  delay(600);
  digitalWrite(9, LOW);
  delay(600);
  digitalWrite(9, HIGH);
  delay(600);
  digitalWrite(9, LOW);

  //S "..."
  delay(1000);
  digitalWrite(9, HIGH);
  delay(300);
  digitalWrite(9, LOW);
  delay(300);
  digitalWrite(9, HIGH);
  delay(300);
  digitalWrite(9, LOW);
  delay(300);
  digitalWrite(9, HIGH);
  delay(300);
  digitalWrite(9, LOW);

}