Morseduino

// Morse Code - USE MQTT!
// based on a project from 30 Arduino Projects for the Evil Genius
// thanks to Simon Monk
 
// Andy Piper @andypiper, Nov 2013
// Dj @codepope, Dec 2013 (Putting it all in a for loop - Just change the message

char* message="use mqtt";

int ledPin = 12;

char* letters[] = {
  ".-", "-...", "-.-.", "-..", ".", "..-.", "--.", "....", "..",    // A-I
  ".---", "-.-", ".-..", "--", "-.", "---", ".--.", "--.-", ".-.",  // J-R
  "...", "-", "..-", "...-", ".--", "-..-", "-.--", "--.."          // S-Z
};
 
char* numbers[] = {"-----", ".----", "..---", "...--", "....-", ".....", "-....", "--...", "---..", "----."};
 
int dotDelay = 200;
 
void setup()                 
{
  pinMode(ledPin, OUTPUT);
  
  for(int n=0;n<3;n++) {
    digitalWrite(ledPin, HIGH); // quick blinks to acknowledge setup
    delay(100);
    digitalWrite(ledPin, LOW);
    delay(100);
  }
  
  delay(dotDelay * 0);      // before we get started
}
 
void loop()                    
{
  for(int n=0;n<strlen(message);n++) {
    char ch=message[n];
   
   if(ch==32) {
     delay(dotDelay * 14);
   } else {
     flashSequence(letters[ch - 'a']);
   }
 
  }
   delay(dotDelay * 14); // end message
}

 
void flashSequence(char* sequence)
{
   int i = 0;
   while (sequence[i] != NULL)
   {
       flashDotOrDash(sequence[i]);
       i++;
   }
   delay(dotDelay * 3); // gap between letters
}
 
void flashDotOrDash(char dotOrDash)
{
  digitalWrite(ledPin, HIGH);
  if (dotOrDash == '.')
  {
    delay(dotDelay);           
  }
  else // must be a -
  {
    delay(dotDelay * 3);           
  }
  digitalWrite(ledPin, LOW);    
  delay(dotDelay); // gap between flashes
}

Better :-) also makes it more ready to receive MQTT messages and swap in for the value of char* message :)