// Define the LED pin
const int ledPin = 12;

// Define the duration of a "dot" in milliseconds
const int dotDuration = 250;

// Define the duration of a "dash" (three times longer than a dot)
const int dashDuration = 3 * dotDuration;

// Define the pause between elements (dots and dashes) of the same letter
const int elementPause = dotDuration;

// Define the pause between letters
const int letterPause = 3 * dotDuration;

void setup() {
  // Initialize the LED pin as an output
  pinMode(ledPin, OUTPUT);
}

void loop() {
  // Blink "S" in Morse code: "..."

  // Dot
  digitalWrite(ledPin, HIGH);
  delay(dotDuration);
  digitalWrite(ledPin, LOW);
  delay(elementPause);

  // Dot
  digitalWrite(ledPin, HIGH);
  delay(dotDuration);
  digitalWrite(ledPin, LOW);
  delay(elementPause);

  // Dot
  digitalWrite(ledPin, HIGH);
  delay(dotDuration);
  digitalWrite(ledPin, LOW);
  delay(letterPause); // Pause before next letter

  // Blink "O" in Morse code: "---"

  // Dash
  digitalWrite(ledPin, HIGH);
  delay(dashDuration);
  digitalWrite(ledPin, LOW);
  delay(elementPause);

  // Dash
  digitalWrite(ledPin, HIGH);
  delay(dashDuration);
  digitalWrite(ledPin, LOW);
  delay(elementPause);

  // Dash
  digitalWrite(ledPin, HIGH);
  delay(dashDuration);
  digitalWrite(ledPin, LOW);
  delay(letterPause); // Pause before next letter

  // Blink "S" in Morse code: "..."

  // Dot
  digitalWrite(ledPin, HIGH);
  delay(dotDuration);
  digitalWrite(ledPin, LOW);
  delay(elementPause);

  // Dot
  digitalWrite(ledPin, HIGH);
  delay(dotDuration);
  digitalWrite(ledPin, LOW);
  delay(elementPause);

  // Dot
  digitalWrite(ledPin, HIGH);
  delay(dotDuration);
  digitalWrite(ledPin, LOW);
  delay(letterPause); // Pause before repeating the message
}