void setup() {
  // put your setup code here, to run once:
pinMode(9, OUTPUT);
pinMode(10, INPUT_PULLUP);
}

void loop() {
  // put your main code here, to run repeatedly:
bool taster, schalte;

taster = digitalRead(10);
schalte = Schalter(taster);
digitalWrite(9, schalte);
}

//Taster als Schalter
bool Schalter (bool button)
{
  static int status = 0;
  if (button == true && status == 0){
    digitalWrite(9, HIGH);
    status++;
  }

  elif (button == false && status == 1){
    digitalWrite(9, LOW);
    status--;
  }

  return (status);
}