void setup() {
  // put your setup code here, to run once:
// Understanding Arduino Variabes
// Here we are going to implement moorse code ... --- ...
pinMode(13, OUTPUT);
}

void loop() {
  // First dot
digitalWrite(13,HIGH);
delay(50);
digitalWrite(13,LOW);
delay(50);
// 2nd dot
digitalWrite(13,HIGH);
delay(50);
digitalWrite(13,LOW);
delay(50);
//  3rd dot 
digitalWrite(13,HIGH);
delay(50);
digitalWrite(13,LOW);
delay(50);
// now we need three dashes
// first dash
digitalWrite(13,HIGH);
delay(500);
digitalWrite(13,LOW);
delay(500);
// 2nd dot
digitalWrite(13,HIGH);
delay(500);
digitalWrite(13,LOW);
delay(500);
//  3rd dot 
digitalWrite(13,HIGH);
delay(500);
digitalWrite(13,LOW);
delay(500);
delay(1000);
// again third time we need ...
digitalWrite(13,HIGH);
delay(50);
digitalWrite(13,LOW);
delay(50);
// 2nd dot
digitalWrite(13,HIGH);
delay(50);
digitalWrite(13,LOW);
delay(50);
//  3rd dot 
digitalWrite(13,HIGH);
delay(50);
digitalWrite(13,LOW);
delay(50);

}