//Morse code. Accepts input over serial, and echoes it to an LED on pin 13.
int
pin = 13, //LED Pin.

//Times are in ms.
ditOn = 100,
dahOn = ditOn*3, //Time to spend on in a dah
total = 800; //Time per beat (off = total - on)

String text = "";

void setup() {
  pinMode(pin, OUTPUT);
  Serial.begin(9600); //9600 baud connection. WOO HIGH SPEED!!!
}

void loop() {
  //There's data to be read. Read it.
  while (Serial.available() > 0) {
    text += char(Serial.read());
  }
  
  Serial.println(text);
  
  //No new data. Loop over current phrase.
  while (!text.equals("")) {
    for (int i = 0; i < text.length(); i++) {
      morse(text.charAt(i));
      //Break out as soon as possible when new data arrives.
      if (Serial.available() > 0) text = "";
    }
  }
}

//Converts 
void morse(char ch) {
  //Yes. A switch statement is really, really ugly. But also easy, and it works.
  switch (ch) {
  case 'a':
    dit(); 
    dah(); 
    pause();
    break;
  case 'b':
    dah(); 
    dit(); 
    dit(); 
    dit(); 
    pause();
    break;
  case 'c':
    dah(); 
    dit(); 
    dah(); 
    dit(); 
    pause();
    break;
  case 'd':
    dah(); 
    dit(); 
    dit(); 
    pause();
    break;
  case 'e':
    dit(); 
    pause();
    break;
  case 'f':
    dit(); 
    dit(); 
    dah(); 
    dit(); 
    pause();
    break;
  case 'g':
    dah(); 
    dah(); 
    dit(); 
    pause();
    break;
  case 'h':
    dit(); 
    dit(); 
    dit(); 
    dit(); 
    pause();
    break;
  case 'i':
    dit(); 
    dit(); 
    pause();
    break;
  case 'j':
    dit(); 
    dah(); 
    dah(); 
    dah(); 
    pause();
    break;
  case 'k':
    dah(); 
    dit(); 
    dah(); 
    pause();
    break;
  case 'l':
    dit(); 
    dah(); 
    dit(); 
    dit(); 
    pause();
    break;
  case 'm':
    dah(); 
    dah(); 
    pause();
    break;
  case 'n':
    dah(); 
    dit(); 
    pause();
    break;
  case 'o':
    dah(); 
    dah(); 
    dah(); 
    pause();
    break;
  case 'p':
    dit(); 
    dah(); 
    dah(); 
    dit(); 
    pause();
    break;
  case 'q':
    dah(); 
    dah(); 
    dit(); 
    dah(); 
    pause();
    break;
  case 'r':
    dit(); 
    dah(); 
    dit(); 
    pause();
    break;
  case 's':
    dit(); 
    dit(); 
    dit(); 
    pause();
    break;
  case 't':
    dah(); 
    pause();
    break;
  case 'u':
    dit(); 
    dit(); 
    dah(); 
    pause();
    break;
  case 'v':
    dit(); 
    dit(); 
    dit(); 
    dah(); 
    pause();
    break;
  case 'w':
    dit(); 
    dah(); 
    dah(); 
    pause();
    break;
  case 'x':
    dah(); 
    dit(); 
    dit(); 
    dah(); 
    pause();
    break;
  case 'y':
    dah(); 
    dit(); 
    dah(); 
    dah(); 
    pause();
    break;
  case 'z':
    dah(); 
    dah(); 
    dit(); 
    dit();   
    pause();
    break;
  }
}

void dit() {
  digitalWrite(pin, HIGH);
  delay(ditOn);
  digitalWrite(pin, LOW);
  delay(total - ditOn);
}

void dah() {
  digitalWrite(pin, HIGH);
  delay(dahOn);
  digitalWrite(pin, LOW);
  delay(total - dahOn);
}

//Extra delay between characters.
void pause() {
  delay(200);
}