#define LED_ARDUINO 13
const unsigned int DIT = 1000;
const unsigned int DAH = 3*DIT;
const unsigned int PAUSE_SYMBOL = DIT;
const unsigned int PAUSE_LETTER = 3*DIT;
const unsigned int PAUSE_WORD = 7*DIT;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(LED_ARDUINO,OUTPUT);
}
void loop() {
  // H
  digitalWrite(LED_ARDUINO,HIGH);delay(DIT);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_SYMBOL);
  digitalWrite(LED_ARDUINO,HIGH);delay(DIT);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_SYMBOL);
  digitalWrite(LED_ARDUINO,HIGH);delay(DIT);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_SYMBOL);
  digitalWrite(LED_ARDUINO,HIGH);delay(DIT);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_LETTER);

  // E
  digitalWrite(LED_ARDUINO,HIGH);delay(DIT);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_LETTER);

  //L
  digitalWrite(LED_ARDUINO,HIGH);delay(DIT);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_SYMBOL);
  digitalWrite(LED_ARDUINO,HIGH);delay(DAH);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_SYMBOL);
  digitalWrite(LED_ARDUINO,HIGH);delay(DIT);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_SYMBOL);
  digitalWrite(LED_ARDUINO,HIGH);delay(DIT);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_LETTER);

  //L
  digitalWrite(LED_ARDUINO,HIGH);delay(DIT);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_SYMBOL);
  digitalWrite(LED_ARDUINO,HIGH);delay(DAH);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_SYMBOL);
  digitalWrite(LED_ARDUINO,HIGH);delay(DIT);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_SYMBOL);
  digitalWrite(LED_ARDUINO,HIGH);delay(DIT);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_LETTER);

  //O
  digitalWrite(LED_ARDUINO,HIGH);delay(DAH);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_SYMBOL);
  digitalWrite(LED_ARDUINO,HIGH);delay(DAH);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_SYMBOL);
  digitalWrite(LED_ARDUINO,HIGH);delay(DAH);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_WORD);

  //W
  digitalWrite(LED_ARDUINO,HIGH);delay(DIT);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_SYMBOL);
  digitalWrite(LED_ARDUINO,HIGH);delay(DAH);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_SYMBOL);
  digitalWrite(LED_ARDUINO,HIGH);delay(DAH);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_LETTER);

  //O
  digitalWrite(LED_ARDUINO,HIGH);delay(DAH);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_SYMBOL);
  digitalWrite(LED_ARDUINO,HIGH);delay(DAH);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_SYMBOL);
  digitalWrite(LED_ARDUINO,HIGH);delay(DAH);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_LETTER);

  //R
  digitalWrite(LED_ARDUINO,HIGH);delay(DIT);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_SYMBOL);
  digitalWrite(LED_ARDUINO,HIGH);delay(DAH);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_SYMBOL);
  digitalWrite(LED_ARDUINO,HIGH);delay(DIT);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_LETTER);

  //L
  digitalWrite(LED_ARDUINO,HIGH);delay(DIT);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_SYMBOL);
  digitalWrite(LED_ARDUINO,HIGH);delay(DAH);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_SYMBOL);
  digitalWrite(LED_ARDUINO,HIGH);delay(DIT);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_SYMBOL);
  digitalWrite(LED_ARDUINO,HIGH);delay(DIT);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_LETTER);

  //D
  digitalWrite(LED_ARDUINO,HIGH);delay(DAH);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_SYMBOL);
  digitalWrite(LED_ARDUINO,HIGH);delay(DIT);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_SYMBOL);
  digitalWrite(LED_ARDUINO,HIGH);delay(DIT);digitalWrite(LED_ARDUINO,LOW);
  delay(PAUSE_WORD);
}