/*
  This program blinks LED connection to the pin number 13, 8, and 4
*/
void setup()
{
  pinMode(13, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(4, OUTPUT);
}
void loop()
{
 // the first LED is made to blink one time
  digitalWrite(13, HIGH);
  delay(1000); // delay time in milliseconds
  digitalWrite(13, LOW);
  delay(1000);
  // the second LED will blink two times
  digitalWrite(8, HIGH);
  delay(500); // the duration is 0.5 seconds
  digitalWrite(8, LOW);
  delay(500);
  digitalWrite(8, HIGH);
  delay(500); 
  digitalWrite(8, LOW);
  delay(500);
   // the third LED will blink three times
  for( int i = 0; i < 3; i = i +1 )
  {
  digitalWrite(4, HIGH);
  delay(500); 
  digitalWrite(4, LOW);
  delay(500);
    // We can adjust the delay time accordingly
  }
}