int led_pin = 2;

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

void loop() {
  // put your main code here, to run repeatedly:
  delay(10); // this speeds up the simulation
  digitalWrite(led_pin, HIGH);
  delay(500);
  digitalWrite(led_pin, LOW);
  delay(500);
}