// Time Unit Definitions
const int DOT = 1000;        
const int DASH = DOT * 3;    
const int SYMBOL_SPACE = DOT;
const int LETTER_SPACE = DOT * 3;
const int SEGMENT_DELAY = 3000;
 
int ledPins[5] = {2, 3, 4, 5, 6}; // LEDs for Morse symbols
const int BUZZER_PIN = 7;         // Pin for buzzer
 
// Morse Code Table
String morseTable[36] = {
  ".-", "-...", "-.-.", "-..", ".", "..-.", "--.", "....", "..", ".---",    // A-J
  "-.-", ".-..", "--", "-.", "---", ".--.", "--.-", ".-.", "...", "-",      // K-T
  "..-", "...-", ".--", "-..-", "-.--", "--..",                              // U-Z
  "-----", ".----", "..---", "...--", "....-", ".....", "-....", "--...",   // 0-7
  "---..", "----."                                                           // 8-9
};
 
// Function Prototypes
void displayMorse(String message);
void blinkMorseChar(char c);
void blinkLEDs(String pattern);
void blinkSymbol(char symbol, int ledIndex);
char caesarShift(char c, int shift);
 
void setup() {
  // Initialize LEDs and buzzer
  for (int i = 0; i < 5; i++) {
    pinMode(ledPins[i], OUTPUT);
  }
  pinMode(BUZZER_PIN, OUTPUT);
}
 
  void loop() {
  // Original segments
  String segments[] = {"208", "MFA", "MSM", "YDS"};
 
  // Display Original Morse Code
  for (int i = 0; i < 4; i++) {
    displayMorse(segments[i]);
    if (i < 3) delay(SEGMENT_DELAY);
  }
 
  delay(3000); // Delay before encrypted Morse
 
  // Encrypted version
  for (int i = 0; i < 4; i++) {
    String encrypted = "";
    for (int j = 0; j < segments[i].length(); j++) {
      encrypted += caesarShift(segments[i][j], 1);
    }
    displayMorse(encrypted);
    if (i < 3) delay(SEGMENT_DELAY);
  }

  delay(5000);
 
}
 
// Display Morse Code for message
void displayMorse(String message) {
  for (int i = 0; i < message.length(); i++) {
    blinkMorseChar(message[i]);
    delay(LETTER_SPACE); // Delay between characters
  }
}
 
// Convert character to Morse and blink each symbol
void blinkMorseChar(char c) {
  int index;
 
  if (c >= 'A' && c <= 'Z') {
    index = c - 'A';
  } else if (c >= '0' && c <= '9') {
    index = 26 + (c - '0');
  } else {
    return;
  }
 
  String morse = morseTable[index];
  blinkLEDs(morse);
}
 
// Blink each symbol with separate LEDs
void blinkLEDs(String pattern) {
  for (int i = 0; i < pattern.length(); i++) {
    if (i < 5) {
      blinkSymbol(pattern[i], i); // Use different LED for each symbol
      delay(SYMBOL_SPACE);
    }
  }
}
 
// Blink one LED for a symbol and play sound
void blinkSymbol(char symbol, int ledIndex) {
  int duration = (symbol == '.') ? DOT : DASH;
 
  // Turn on current LED
  digitalWrite(ledPins[ledIndex], HIGH);
  tone(BUZZER_PIN, 1000); // 1000Hz tone
 
  delay(duration);
 
  // Turn off LED and sound
  digitalWrite(ledPins[ledIndex], LOW);
  noTone(BUZZER_PIN);
}
 
// Caesar Cipher Shift
char caesarShift(char c, int shift) {
  if (c >= 'A' && c <= 'Z') {
    return ((c - 'A' + shift) % 26) + 'A';
  } else if (c >= 'a' && c <= 'z') {
    return ((c - 'a' + shift) % 26) + 'a';
  } else if (c >= '0' && c <= '9') {
    return ((c - '0' + shift) % 10) + '0';
  }
  return c;
}