// Morse Code Translator with LED and Buzzer
// For Wokwi Arduino Uno Simulator

const int ledPin = 13;      // LED connected to digital pin 13
const int buzzerPin = 12;    // Buzzer connected to digital pin 12

// Morse code timing constants (in milliseconds)
const int dotDuration = 200;          // Duration of a dot
const int dashDuration = dotDuration * 3; // Duration of a dash
const int elementGap = dotDuration;    // Gap between dots/dashes
const int letterGap = dotDuration * 3; // Gap between letters
const int wordGap = dotDuration * 7;   // Gap between words

// Morse code lookup table
const char* morseCodes[] = {
  ".-", "-...", "-.-.", "-..", ".", "..-.", "--.", "....", "..",    // A-I
  ".---", "-.-", ".-..", "--", "-.", "---", ".--.", "--.-", ".-.",   // J-R 
  "...", "-", "..-", "...-", ".--", "-..-", "-.--", "--..",          // S-Z
  "-----", ".----", "..---", "...--", "....-", ".....", "-....",     // 0-6
  "--...", "---..", "----."                                         // 7-9
};

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
  Serial.begin(9600);
  Serial.println("Morse Code Translator");
  Serial.println("Enter text to translate to Morse code:");
}

void loop() {
  if (Serial.available() > 0) {
    String input = Serial.readString();
    input.toUpperCase();
    Serial.print("Translating: ");
    Serial.println(input);
    
    for (int i = 0; i < input.length(); i++) {
      char c = input.charAt(i);
      
      if (c == ' ') {
        // Word space
        Serial.print(" / ");
        delay(wordGap);
      } else if (isAlphaNumeric(c)) {
        // Convert character to Morse code
        if (isAlpha(c)) {
          // Letters A-Z (ASCII 65-90)
          int index = c - 'A';
          Serial.print(morseCodes[index]);
          Serial.print(' ');
          playMorseCode(morseCodes[index]);
        } else if (isDigit(c)) {
          // Numbers 0-9 (ASCII 48-57)
          int index = c - '0' + 26; // Numbers start at index 26
          Serial.print(morseCodes[index]);
          Serial.print(' ');
          playMorseCode(morseCodes[index]);
        }
        delay(letterGap);
      }
    }
    Serial.println();
    Serial.println("Translation complete. Enter new text:");
  }
}

void playMorseCode(const char* morseCode) {
  for (int i = 0; i < strlen(morseCode); i++) {
    char element = morseCode[i];
    
    // Turn on LED and buzzer
    digitalWrite(ledPin, HIGH);
    tone(buzzerPin, 1000); // 1000Hz tone
    
    if (element == '.') {
      delay(dotDuration);
    } else if (element == '-') {
      delay(dashDuration);
    }
    
    // Turn off LED and buzzer
    digitalWrite(ledPin, LOW);
    noTone(buzzerPin);
    
    // Gap between elements (except after last element)
    if (i < strlen(morseCode) - 1) {
      delay(elementGap);
    }
  }
}