ASCII ( American Standard Code for Information Interchange) Table

Morse translator, when I pulse one letter in the keyboard the leds get high

ASCII converteix les lletres en valors en minuscula a-z del 97-122 i les majuscules A-Z de 65 - 90, 0-9 = 48-57, 32=space. Per exemple S O S = 83-32-79-32-83-00

Here's the Table

    // Morse code for blinking a LED
int ledPin = 13;// int means integer.
int dotDelay = 200;

char* letters[] = { //[] It means an array, with the name letters for the array, char is a type of variable meaning character. * Is a pointer, it points to the characters of the array in order
  ".-", "-...", "-.-.", "-..", ".", "..-.", "--.", "....", "..",    // A-I
  ".---", "-.-", ".-..", "--", "-.", "---", ".--.", "--.-", ".-.",  // J-R
  "...", "-", "..-", "...-", ".--", "-..-", "-.--", "--.."          // S-Z
};

char* numbers[] = {
  "-----", ".----", "..---", "...--", "....-", ".....", "-....", "--...", "---..", "----."}; // It's a second array for numbers 0 to 9, these two arrays are arrays of arrays, also know as an array of string literals, ex of string literal: ..---, an other could be az8mhello because a string is several character together like a word. String literal can be named string.
  
  // We could think as an array of an array of characters
  
  // If I write letter[0] it means .- because it's the first element of the array, and letters[26] is --..
  
  //Afterworks .- will mean A and --.. will mean Z

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] != 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
}

    

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