void setup() {
  
  Serial.begin(115200);

  pinMode(18, OUTPUT);
  pinMode(19, INPUT_PULLUP);
  pinMode(21, INPUT_PULLDOWN);
  pinMode(22, INPUT_PULLUP);

}

void loop() {
  


bool status_drukknop3 = digitalRead(19);
bool status_drukknop2 = digitalRead(21);
bool status_drukknop1 = digitalRead(22);
(digitalWrite (18, status_drukknop3 && !status_drukknop2 && status_drukknop1));


}