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

  pinMode(D15, INPUT);
  pinMode(D2, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation

digitalWrite(D15, HIGH);
digitalWrite(D2, LOW);

delay(1000);
digitalWrite(D15, LOW);
digitalWrite(D2, HIGH);
}