const int buzzerPin = 13;

// Define Morse code timings
const int dotDuration = 600 / 25;  // Duration of a dot in milliseconds
const int dashDuration = 3 * dotDuration;  // Duration of a dash (3 dots)
const int letterSpaceDuration = dotDuration;  // Space between letters
const int wordSpaceDuration = 7 * dotDuration;   // Space between words

// Morse code lookup table
const char* morseCode[] = {
  ".-",   // A
  "-...", // B
  "-.-.", // C
  "-..",  // D
  ".",    // E
  "..-.", // F
  "--.",  // G
  "....", // H
  "..",   // I
  ".---", // J
  "-.-",  // K
  ".-..", // L
  "--",   // M
  "-.",   // N
  "---",  // O
  ".--.", // P
  "--.-", // Q
  ".-.",  // R
  "...",  // S
  "-",    // T
  "..-",  // U
  "...-", // V
  ".--",  // W
  "-..-", // X
  "-.--", // Y
  "--.."  // Z
};

void playMorseCharacter(const char morseChar) {
  int index = morseChar - 'A';
  if (index >= 0 && index < 26) {
    const char* morseSequence = morseCode[index];
    for (int i = 0; morseSequence[i] != '\0'; i++) {
      if (morseSequence[i] == '.') {
        tone(buzzerPin, 1000, dotDuration);
      } else if (morseSequence[i] == '-') {
        tone(buzzerPin, 1000, dashDuration);
      }
      delay(dotDuration + 150);  // Add a small gap between dots and dashes
      noTone(buzzerPin);        // Stop the tone
      delay(dotDuration);       // Pause between dots and dashes
    }
    delay(letterSpaceDuration);
  } else if (morseChar == ' ') {
    delay(wordSpaceDuration);
  }
}

void playSOS() {
  // "SOS" in Morse code: "... --- ..."
  playMorseCharacter('S');
  playMorseCharacter('O');
  playMorseCharacter('S');
}

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

void loop() {
  playSOS();      // Play "SOS" in Morse code
  delay(3000);    // 3-second interval
}