void setup() 
{
  Serial.begin(115200);
  pinMode(18, OUTPUT);
  pinMode(4, OUTPUT);
}

void loop() 
{
  efecto(100);
  efecto(100);
  efecto(100);
  delay(10000); 
  efecto2(1000);
  efecto2(1000);
  efecto2(1000);
  delay(10000); 
}
void efecto(int tiempo)
{
  digitalWrite(18,HIGH);
  delay(tiempo);
  digitalWrite(18,LOW);
  delay(tiempo);
  digitalWrite(18,HIGH);
  delay(tiempo);
  digitalWrite(18,LOW);
  delay(tiempo);
  digitalWrite(4,HIGH);
  delay(tiempo);
  digitalWrite(4,LOW);
  delay(tiempo);
  digitalWrite(4,HIGH);
  delay(tiempo);
  digitalWrite(4,LOW);
  delay(tiempo);
}
void efecto2(int retardo)
{
  digitalWrite(18, HIGH);
  digitalWrite(4, HIGH);
  delay(retardo);
  digitalWrite(18, LOW);
  digitalWrite(4, LOW);
  delay(retardo);
  digitalWrite(18, HIGH);
  digitalWrite(4, HIGH);
  delay(retardo);
  digitalWrite(18, LOW);
  digitalWrite(4, LOW);
  delay(retardo);
}