// Constants
const int speakerPin = 13;    // Digital pin for the speaker
int morseLED = 2;    // Digital pin for the LED

// Play a dot
void Morse_PlayDot(int dotDuration) {
  digitalWrite(morseLED, HIGH);
  tone(speakerPin, 1000, dotDuration);
  delay(dotDuration);
  digitalWrite(morseLED, LOW);
  noTone(speakerPin);
}

// Play a dash
void Morse_PlayDash(int dotDuration) {
  digitalWrite(morseLED, HIGH);
  tone(speakerPin, 1000, dotDuration * 3);
  delay(dotDuration * 3);
  digitalWrite(morseLED, LOW);
  noTone(speakerPin);
}
// Translate text to Morse code and play it
void Morse(const String& textToMorse, int dotDuration = 200) {
  // Morse code dictionary
  const char* morseCodes[] = {
    ".-", "-...", "-.-.", "-..", ".", "..-.", "--.", "....", "..", ".---",
    "-.-", ".-..", "--", "-.", "---", ".--.", "--.-", ".-.", "...", "-", 
    "..-", "...-", ".--", "-..-", "-.--", "--.."
  };
  
  for (int i = 0; i < textToMorse.length(); i++) {
    char ch = toLowerCase(textToMorse[i]);
    if (ch == ' ') {
      delay(dotDuration * 3);    // Pause between words
    } else if (isAlphaNumeric(ch)) {
      int index = ch - 'a';
      if (isDigit(ch)) {
        index = ch - '0' + 26;
      }
      String morseCode = morseCodes[index];
      for (int j = 0; j < morseCode.length(); j++) {
        char symbol = morseCode[j];
        if (symbol == '.') {
          Morse_PlayDot(dotDuration);
        } else if (symbol == '-') {
          Morse_PlayDash(dotDuration);
        }
        delay(dotDuration);    // Pause between dots and dashes
      }
      delay(dotDuration * 2);  // Pause between letters
    }
  }
}

// Setup function
void setup() {
  pinMode(speakerPin, OUTPUT);
  Serial.begin(9600);
}

// Main loop
void loop() {
  if (Serial.available() > 0) {
    String input = Serial.readStringUntil('\n');
    Morse(input);
  }
}