// Morse code "S" (three short blinks)
int ledPin = 0;
int shortDelay = 200;  // Short blink duration
int pauseDelay = 200;  // Pause between blinks
int longPause = 1000;  // Pause between sequences

void setup() {
  pinMode(ledPin, OUTPUT);
}

void loop() {
  // Morse "S" - three short blinks
  
  // First blink
  digitalWrite(ledPin, HIGH);
  delay(shortDelay);
  digitalWrite(ledPin, LOW);
  delay(pauseDelay);
  
  // Second blink
  digitalWrite(ledPin, HIGH);
  delay(shortDelay);
  digitalWrite(ledPin, LOW);
  delay(pauseDelay);
  
  // Third blink
  digitalWrite(ledPin, HIGH);
  delay(shortDelay);
  digitalWrite(ledPin, LOW);
  delay(pauseDelay);
  
  delay(longPause);  // Wait before repeating
}