const int ledPin = 19;
const int btnPin = 18;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(ledPin, OUTPUT);
  pinMode(btnPin, INPUT);
}

void loop() {
  // digitalWrite(ledPin, HIGH); // Turn on the LED
  // delay(1000); // Wait for 1 second
  // digitalWrite(ledPin, LOW); // Turn off the LED
  delay(1000); // Wait for 1 second
  Serial.println(digitalRead(btnPin));
}