void setup() {
  pinMode(13, OUTPUT);  // LED pin is OUTPUT
}

void loop() {
  //           LED on      pause                     LED off    pause
  digitalWrite(13, HIGH);  delay(200);  digitalWrite(13, LOW);  delay(200);
  digitalWrite(13, HIGH);  delay(200);  digitalWrite(13, LOW);  delay(200);
  digitalWrite(13, HIGH);  delay(200);  digitalWrite(13, LOW);  delay(200);
  delay(400);  // inter-character pause
  digitalWrite(13, HIGH);  delay(600);  digitalWrite(13, LOW);  delay(200);
  digitalWrite(13, HIGH);  delay(600);  digitalWrite(13, LOW);  delay(200);
  digitalWrite(13, HIGH);  delay(600);  digitalWrite(13, LOW);  delay(200);
  delay(400);  // inter-character pause
  digitalWrite(13, HIGH);  delay(200);  digitalWrite(13, LOW);  delay(200);
  digitalWrite(13, HIGH);  delay(200);  digitalWrite(13, LOW);  delay(200);
  digitalWrite(13, HIGH);  delay(200);  digitalWrite(13, LOW);  delay(200);
  delay(1200); // inter-word pause
}