void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(19, OUTPUT);
  pinMode(5, OUTPUT);
}

void loop() {
  digitalWrite(19, HIGH);
  digitalWrite(5, LOW);
  delay(2000);
  digitalWrite(19, LOW);
  digitalWrite(5, HIGH);
  delay(2000);
   // this speeds up the simulation
}