int pinLed = 4;
int pinPulsador = 23;

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

void loop() {
  if(digitalRead(pinPulsador) == 0){
    digitalWrite(pinLed, HIGH);
    delay(1000);

    digitalWrite(pinLed, LOW);
    delay(1000);
  }
}