// 30 Projects for the Evil Genius: Project #3; Page 32-35
int ledPin = 13;
char* letters[ ] = {
".-", "-...", "-.-.", "-..", ".", "..-.", "--.", "....", "..", 		// A-I
".---", "-.-", ".-..", "--", "-.", "---", ".--.", "--.-", ".-.", 	// J-R
"...", "-", "..-", "...-", ".--", "-..-", "-.--", "--.." };		// S-Z
char* numbers[ ] = {
"-----", ".----", "..---", "...--", "....-", ".....", "-....", "--...", "---..", "----." };
int dotDelay = 200;
void setup( ) {
pinMode(ledPin, OUTPUT);	Serial.begin(9600);	}

void loop( ) {
char ch;
if ( Serial.available( ) )   {	// is there anything to be read from USB?
ch = Serial.read( ); 		// read a single letter
      if (ch >= 'a' && ch <= 'z')	{
      flashSequence(letters[ch - 'a'] );
}
      else if (ch >= 'A' && ch <= 'Z')	{
      flashSequence(letters[ch - 'A']);
}
      else if (ch >= '0' && ch <= '9')	{
      flashSequence(numbers[ch - '0']);
}
      else if (ch == ' ')	{
      delay(dotDelay * 4); 		// gap between words
}	}	}
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
      delay(dotDelay * 3);
}
digitalWrite(ledPin, LOW);
      delay(dotDelay); 	// gap between flashes
}