/*
  Arduino | coding-help
  Morse Code on Pin 13 LED (Arduino Uno)

  Halcyon
  January 19, 2026 at 8:18 PM
*/

int16_t element = 10; //In hundreds of ms, change to make timing faster or slower. Dot is 1 unit, dash is 3, word break is 7
// Make ^ larger if you have trouble reading the flashes
String inputStr = "KF8ETG Hello World 2026"; //My call sign, Peter Ver Duin, KF8ETG
int inLen = 0;
char* morse_code;
char *alphaArr[26] = { ".-", "-...", "-.-.", "-..", ".", "..-.", "--.", "....", "..", ".---", "-.-", ".-..", "--", "-.", "---", ".--.", "--.-", ".-.", "...", "-", "..-", "...-", ".--", "-..-", "-.--", "--.." };
char *numbsArr[10] = { "-----", ".----", "..---", "...--", "....-", ".....", "-....", "--...", "---..", "----." };

void dot(int16_t duration) {
  digitalWrite(13, HIGH);
  delay(duration * 100);
  digitalWrite(13, LOW);
  delay(duration * 100);
}

void dash(int16_t duration) {
  digitalWrite(13, HIGH);
  delay(duration * 300);
  digitalWrite(13, LOW);
  delay(duration * 100);
}

void space(int16_t duration) {
  digitalWrite(13, LOW);
  delay(duration * 700);
}

void setup() {
  pinMode(13, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  // Serial.println("Enter the string to flash:");
  // while (Serial.available() == 0) {}
  // inputStr = Serial.readString();
  // Uncomment these three lines to allow flashing of any input (alphanumeric characters and space only)

  Serial.println(inputStr);

  inLen = inputStr.length();

  for (int i = 0; i < inLen; i++) { // convert to morse
    if (isUpperCase(inputStr[i])) {
      morse_code = alphaArr[inputStr[i] - 'A'];
    }
    else if (isLowerCase(inputStr[i])) {
      morse_code = alphaArr[inputStr[i] - 'a'];
    }
    else if (isDigit(inputStr[i])) {
      morse_code = numbsArr[inputStr[i] - '0'];
    }
    else if (isSpace(inputStr[i])) {
      morse_code = "/";
    }
    else {
      Serial.print("No International Morse for ");
      Serial.print(inputStr[i]);
      Serial.print(" ");
    }

    Serial.print(morse_code);
    Serial.print(" "); // comment out this line and the one above to remove the terminal output and purely flash the code
    for (int j = 0; j < strlen(morse_code); ++j) {
      if (morse_code[j] == '.') {
        dot(element);
      }
      else if (morse_code[j] == '-') {
        dash(element);
      }
      else {
        space(element);
      }
    }
  }
  Serial.println();
}