int button1 = 15;
int button2 = 2 ;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(button1, INPUT);
  pinMode(button2, INPUT);

}
// Active LOW
void loop() {
  int BUTTON1 = digitalRead(button1);
  int BUTTON2 = digitalRead(button2);

  if (BUTTON1 == LOW){
    Serial.println("Push Button 1 is Pressed");
    delay(200);
  }
//Active HIGH
  if (BUTTON2 == HIGH){
    Serial.println("Push Button 2 is Pressed");
    delay(200);
  }

}