#define DELAY_DOT 250  // Time for a dot
#define DELAY_DASH 750  // Time for a dash
#define DELAY_BETWEEN_PARTS 250  // Time between parts of the same letter
#define DELAY_BETWEEN_LETTERS 1000  // Time between letters
#define DELAY_BETWEEN_WORDS 1500  // Time between words
#define LED_PIN LED_BUILTIN  // Predefined constant for onboard LED

void setup() {
  pinMode(33, OUTPUT);  // Set LED pin as an output
}

void dot() {
  digitalWrite(33, HIGH);
  delay(DELAY_DOT);  // Short duration for dot
  digitalWrite(33, LOW);
  delay(DELAY_BETWEEN_PARTS);  // Pause between parts of the same letter
}

void dash() {
  digitalWrite(33, HIGH);
  delay(DELAY_DASH);  // Longer duration for dash
  digitalWrite(33, LOW);
  delay(DELAY_BETWEEN_PARTS);  // Pause between parts of the same letter
}

void loop() {
  // Morse code for "SOS": · · · — — — · · ·
  
  // S: · · ·
  dot();
  dot();
  dot();
  delay(DELAY_BETWEEN_LETTERS);  // Time between letters

  // O: — — —
  dash();
  dash();
  dash();
  delay(DELAY_BETWEEN_LETTERS);  // Time between letters

  // S: · · ·
  dot();
  dot();
  dot();
  delay(DELAY_BETWEEN_WORDS);  // Time between repetitions
}