int dotDelay = 200;
int dashDelay = 500;
int spaceDelay = 300;
int ledPin = 2;

void setup() {
  pinMode(ledPin, OUTPUT);

}

void loop() {
  // Morse code for "SOS"
  blinkDot(); blinkDot(); blinkDot();
  delay(spaceDelay);
  blinkDot(); blinkDot(); blinkDot();
  delay(spaceDelay);
  blinkDot(); blinkDot(); blinkDot();
  delay(spaceDelay * 3); //wait before repeating
}

void blinkDot() {
  digitalWrite(ledPin, HIGH);
  delay(dotDelay);
  digitalWrite(ledPin, LOW);
  delay(dotDelay);
}

void blinkDash() {
  digitalWrite(ledPin, HIGH);
  delay(dashDelay);
  digitalWrite(ledPin, LOW);
  delay(dotDelay);
}