void setup() {
  pinMode(13, OUTPUT);  // Set pin 13 as an output
}

void loop() {
  // S (... in Morse code)
  for (int i = 0; i < 3; i++) {
    digitalWrite(13, HIGH);
    delay(200);
    digitalWrite(13, LOW);
    delay(200);
  }
  delay(400);  // Pause between letters

  // O (--- in Morse code)
  for (int i = 0; i < 3; i++) {
    digitalWrite(13, HIGH);
    delay(600);
    digitalWrite(13, LOW);
    delay(200);
  }
  delay(400);  // Pause between letters

  // S (... in Morse code)
  for (int i = 0; i < 3; i++) {
    digitalWrite(13, HIGH);
    delay(200);
    digitalWrite(13, LOW);
    delay(200);
  }
  
  delay(1000);  // Pause before repeating the sequence
}