#define LED  2
#define LED_out  5

// constants won't change. They're used here to set pin numbers:
const int buttonPin = 15;     // the number of the pushbutton pin

// variables will change:
int buttonState = 0;         // variable for reading the pushbutton status

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  // initialize the LEDs pin as an output:
  pinMode(LED, OUTPUT);
  pinMode(LED_out, OUTPUT);
  // initialize the pushbutton pin as an input:
  pinMode(buttonPin, INPUT_PULLUP);
}

void loop() {
   // read the state of the pushbutton value:
  buttonState = digitalRead(buttonPin);
// check if the pushbutton is pressed. If it is, the buttonState is LOW:
  if (buttonState == HIGH) {
    digitalWrite(LED, HIGH);   // turn the LED on (HIGH is the voltage level)
    digitalWrite(LED_out, LOW);    // turn the LED off by making the voltage LOW
     
  } else {                      // wait for a second
  digitalWrite(LED, LOW);    // turn the LED off by making the voltage LOW
  digitalWrite(LED_out, HIGH);   // turn the LED on (HIGH is the voltage level)
  Serial.println("Button pressed!");
  }                   
delay(100); //what happen if I comment this line OUT?
}