int button_1 = 27;
int button_2 = 26;

void setup(){
  Serial.begin(9600);
  // initialize the digital pins as inputs
  pinMode(button_1, INPUT);
  pinMode(button_2, INPUT);
}

// active low
// active high

void loop(){
  // read the state of the pushbutton values:
  int buttonState1 = digitalRead(button_1);
  int buttonState2 = digitalRead(button_2);

  // active low
  if (buttonState1 == LOW){
    Serial.println("Push Button 1 is Pressed");
    delay(200); // debounce
  }

  // active high
  if (buttonState2 == HIGH){
    Serial.println("Push Button 2 is Pressed");
    delay(200); // debounce
  }
}