olha aqui joão

void setup()
{
  pinMode(13, OUTPUT);
}

void loop()
{for(int i= 0; i<3;i++){
  digitalWrite(3, HIGH);
  delay(400); // Wait for 1000 millisecond(s)
  digitalWrite(3, LOW);
  delay(200); // Wait for 1000 millisecond(s)
}
 delay(900);
 for(int j = 0; j<3; j++){
   digitalWrite(3, HIGH);
  delay(800); // Wait for 1000 millisecond(s)
  digitalWrite(3, LOW);
  delay(200); // Wait for 1000 millisecond(s)
 }
 delay(900);
for(int i= 0; i<3;i++){
  digitalWrite(3, HIGH);
  delay(400); // Wait for 1000 millisecond(s)
  digitalWrite(3, LOW);
  delay(200); // Wait for 1000 millisecond(s)
}
     delay(1300);
}