int button1 = 15;
int button2 = 2;

void setup() {
  pinMode(button1, INPUT);
  pinMode(button2, INPUT);
  
  Serial.begin(9600);
  Serial.println("Hello, ESP32!");
}

void loop() {
  int button1_state = digitalRead(button1);
  int button2_state = digitalRead(button2);

  if (button1_state == LOW)
  {
    Serial.println("button 1 is pressed");
    delay(200);
  }

  if (button2_state == HIGH)
  {
    Serial.println("button 2 is pressed");
    delay(200);
  }
}