ESP32 Keypad 1×4 Basic Program

const int buttonPin1 = 36;
const int buttonPin2 = 39;
const int buttonPin3 = 34;
const int buttonPin4 = 35;

int buttonState1 = 0;  
int buttonState2 = 0;
int buttonState3 = 0;
int buttonState4 = 0;

void setup() {
  Serial.begin(9600);

  pinMode(buttonPin1, INPUT);
  pinMode(buttonPin2, INPUT);
  pinMode(buttonPin3, INPUT);
  pinMode(buttonPin4, INPUT);
}

void loop() {
  buttonState1 = digitalRead(buttonPin1);
  buttonState2 = digitalRead(buttonPin2);
  buttonState3 = digitalRead(buttonPin3);
  buttonState4 = digitalRead(buttonPin4);


  if (buttonState1 == LOW) {
    Serial.println("Button 1 Pressed!");
  }
  if (buttonState2 == LOW) {
    Serial.println("Button 2 Pressed!");
  }
  if (buttonState3 == LOW) {
    Serial.println("Button 3 Pressed!");
  }
  if (buttonState4 == LOW) {
    Serial.println("Button 4 Pressed!");
  }

  delay(150);
}