#define LED_OUTPUT 4

void setup() {
  // assigning pin to show ouput
  pinMode(LED_OUTPUT, OUTPUT);
  // Serial.begin(115200);
  // Serial.println("Hello, ESP32!");
}

void loop() {
  //for turning LED on
  digitalWrite(LED_OUTPUT, HIGH);
  // for some delay to see the blink result. 
  delay(800);
  //for turning LED off
  digitalWrite(LED_OUTPUT, LOW);
  // delay of 10 milliseconds for next simulation
  delay(800); // this speeds up the simulation
}