Blink 5

Here is the entire code:

int ledPin = 12; // the red LED is connected to Pin 12
int dotDelay = 200; // wait 0,2 seconds

char* letters[] = {
".-", "-...", "-.-.", "-..", ".", "..-.", "--.", "....", "..", // A-I
".---", "-.-", ".-..", "--", "-.", "---", ".--.", "--.-", ".-.", // J-R
"...", "-", "..-", "...-", ".--", "-..-", "-.--", "--.." // S-Z
};

char* numbers[] = {
"-----", ".----", "..---", "...--", "....-", ".....", "-....", "--...", "---..", "----."}; // 0-9/c2>

void setup()
// sse ledPin as output
{
pinMode(ledPin, OUTPUT);
Serial.begin(9600);
}

void loop()
{
char ch;
if (Serial.available() > 0)
{
ch = Serial.read();
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 dash
{
delay(dotDelay * 3);
}
digitalWrite(ledPin, LOW);
delay(dotDelay); // gap between flashes
}

By: Juan Antonio Calvete and Joel Poderós.