Never gonna give you up - morse code

arduino-morse.c

int ledPin = 13;

#define DOT_LENGTH 250
// A dash is equal to three dots
#define DASH_LENGTH (DOT_LENGTH * 3)
// The space between parts of the same letter is equal to one dot
#define PART_PAUSE DOT_LENGTH
// The space between two letters is equal to three dots
#define LETTER_PAUSE ((DOT_LENGTH * 3) - PART_PAUSE)
// The space between two words is equal to seven dots
#define WORD_PAUSE ((DOT_LENGTH * 7) - LETTER_PAUSE)
#define MESSAGE_PAUSE ((WORD_PAUSE * 3) - WORD_PAUSE)

void setup(){
   pinMode(ledPin, OUTPUT);
}

void dot(){
  digitalWrite(ledPin, HIGH);
  delay(DOT_LENGTH);
  digitalWrite(ledPin, LOW);
  delay(PART_PAUSE);
}

void dash(){
  digitalWrite(ledPin, HIGH);
  delay(DASH_LENGTH);
  digitalWrite(ledPin, LOW);
  delay(PART_PAUSE);
}

void morse(char c){
  switch(toupper(c)){
    case 'A':
      dot(); dash();
      break;
    case 'B':
      dash(); dot(); dot(); dot();
      break;
    case 'C':
      dash(); dot(); dash(); dot();
      break;
    case 'D':
      dash(); dot(); dot();
      break;
    case 'E':
      dot();
      break;
    case 'F':
      dot(); dot(); dash(); dot();
      break;
    case 'G':
      dash(); dash(); dot();
      break;
    case 'H':
      dot(); dot(); dot(); dot();
      break;
    case 'I':
      dot(); dot();
      break;
    case 'J':
      dot(); dash(); dash(); dash();
      break;
    case 'K':
      dash(); dot(); dash();
      break;
    case 'L':
      dot(); dash(); dot(); dot();
      break;
    case 'M':
      dash(); dash();
      break;
    case 'N':
      dash(); dot();
      break;
    case 'O':
      dash(); dash(); dash();
      break;
    case 'P':
      dot(); dash(); dash(); dot();
      break;
    case 'Q':
      dash(); dash(); dot(); dash();
      break;
    case 'R':
      dot(); dash(); dot();
      break;
    case 'S':
      dot(); dot(); dot();
      break;
    case 'T':
      dash();
      break;
    case 'U':
      dot(); dot(); dash();
      break;
    case 'V':
      dot(); dot(); dot(); dash();
      break;
    case 'W':
      dot(); dash(); dash();
      break;
    case 'X':
      dash(); dot(); dot(); dash();
      break;
    case 'Y':
      dash(); dot(); dash(); dash();
      break;
    case 'Z':
      dash(); dash(); dot(); dot();
      break;
    case '1':
      dot(); dash(); dash(); dash(); dash();
      break;
    case '2':
      dot(); dot(); dash(); dash(); dash();
      break;
    case '3':
      dot(); dot(); dot(); dash(); dash();
      break;
    case '4':
      dot(); dot(); dot(); dot(); dash();
      break;
    case '5':
      dot(); dot(); dot(); dot(); dot();
      break;
    case '6':
      dash(); dot(); dot(); dot(); dot();
      break;
    case '7':
      dash(); dash(); dot(); dot(); dot();
      break;
    case '8':
      dash(); dash(); dash(); dot(); dot();
      break;
    case '9':
      dash(); dash(); dash(); dash(); dot();
      break;
    case '0':
      dash(); dash(); dash(); dash(); dash();
      break;
    case ' ':
      delay(WORD_PAUSE);
      break;
  }
}

void output(char *str){
  size_t i;
  for(i = 0; i < strlen(str); ++i){
    morse(str[i]);
    delay(LETTER_PAUSE);
  }
  
  delay(MESSAGE_PAUSE);
}

void loop() {
  output("Never gonna give you up");
  output("Never gonna let you down");
  output("Never gonna run around and desert you");
  output("Never gonna make you cry");
  output("Never gonna say goodbye");
  output("Never gonna tell a lie and hurt you");  
}