#define LED 2
#define SPEAKER 8

int abstand = 330;

char alphabet[36] = {'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', '1', '2', '3', '4', 
                    '5', '6', '7', '8', '9', '0'};

String morseCode[36] = {".-", "-...", "-.-.", "-..", ".",
                        "..-.", "--.", "....", "..", ".---",
                        "-.-", ".-..", "--", "-.", "---",
                        ".--.", "--.-", ".-.", "...", "-",
                        "..-", "...-", ".--", "-..-", "-.--",
                        "--..", ".----", "..---", "...--", "....-",
                        ".....", "-....", "--...", "---..", "----.", "-----"};

void sendePunktSignal(){
  digitalWrite(LED, HIGH);
  tone(SPEAKER, 770);
  delay(abstand);
  digitalWrite(LED, LOW);
  noTone(SPEAKER);
  delay(abstand);
}

void sendeStrichSignal(){
  digitalWrite(LED, HIGH);
  tone(SPEAKER, 770);
  delay(abstand * 2);
  digitalWrite(LED, LOW);
  noTone(SPEAKER);
  delay(abstand);
}

String zeichenZuMorse(char c)
{
  String ruckgabe = "";
  for (int i = 0; i < sizeof alphabet; i++)
  {
    if (alphabet[i] == c){
      ruckgabe = morseCode[i];
      return ruckgabe;
    }
  }
}

void morseZuSignal(String s)
{
  for (int i = 0; i < s.length(); i++)
  {
    if(s[i] == '.')
    {
      sendePunktSignal();
    }else if (s[i] == '-') {
      sendeStrichSignal();
    }
  }
}

void setup() {
  Serial.begin(9600);
  pinMode(LED, OUTPUT);
  pinMode(SPEAKER, OUTPUT);
}

void loop() {
  String morseCode = zeichenZuMorse('S');
  morseZuSignal(morseCode);
  Serial.print(morseCode);

  morseCode = zeichenZuMorse('O');
  morseZuSignal(morseCode);
  Serial.print(morseCode);

    
  morseCode = zeichenZuMorse('S');
  morseZuSignal(morseCode);
  Serial.print(morseCode);
 
  Serial.print(" ");
  delay(abstand * 5); //Abstand zwischen den Buchstaben
}