void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(27, OUTPUT);
  pinMode(19, OUTPUT);
  
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(27, HIGH);
  delay(2000);
  digitalWrite(27, LOW);
  digitalWrite(19, HIGH);
  delay(2000);
  digitalWrite(19, LOW); // this speeds up the simulation
}