2 Program of Morse Code with the help of Blink in Arduino UNO

Program:

const int dotDelay = 200;
const int ledPin = 13;

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


char* numbers[] = {"-----", ".----", "..---", "...--", "....-",
".....", "-....", "--...", "---..", "----."};


void setup()
{
  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] != '\0')
  {
    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
}

Output:

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