int btn = 12;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(btn, INPUT);
}

int lastState = HIGH;

void loop() {
  int btn_value = digitalRead(12);
  Serial.println(btn_value);
  delay(500); // this speeds up the simulation

}