https://www.robotdazero.it/blog/tradurre-il-codice-morse-con-arduino/

tradurre-il-codice-morse-con-arduino

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()) {
        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);
}
void flashDotOrDash(char dotOrDash)
{
    digitalWrite(ledPin, HIGH);
    if (dotOrDash == ‘.’) {
        delay(dotDelay);
    }
    else // must be a -
    {
        delay(dotDelay * 3);
    }
    digitalWrite(ledPin, LOW);
    delay(dotDelay);
}