void setup() {
  // put your setup code here, to run once:
  pinMode(4, OUTPUT);
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
}

void loop() {
  digitalWrite(4, HIGH);
  Serial.println("LED AN");
  delay(200);
  digitalWrite(4, LOW);
  Serial.println("LED AUS");
  delay(200);
}