int button_1 = 19;
int button_2 = 18;

void setup() {
  pinMode(button_1, INPUT);
  pinMode(button_2, INPUT);

  Serial.begin(9600);
}

void loop() {
  int button_1_state = digitalRead(button_1);
  int button_2_state = digitalRead(button_2);
  if(button_1_state == LOW){
    Serial.println("Button 1 is pressed");
    delay(200);
  }
  if(button_2_state == HIGH){
    Serial.println("Button 2 is pressed");
    delay(200);
  }
}