int Pullup=13;//Pin zu Ground
int Pulldown=12;//5V zu Taster, Pin zu Taster, von Taster zu GND mit Widerstand

void setup() {
  // put your setup code here, to run once:
  pinMode(Pullup, INPUT_PULLUP);
  pinMode(Pulldown, INPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  int ButtonState1 = !digitalRead(Pullup);
  int ButtonState2 = digitalRead(Pulldown);
  Serial.print(ButtonState1);
  Serial.println(ButtonState2);
}