// Globale Variablen
int s0;
int warten;

// Initialisierung
void setup() {
  // put your setup code here, to run once:

pinMode(9, OUTPUT);
pinMode(10, INPUT_PULLUP);
}

// Endlosschleife
void loop() {
  // put your main code here, to run repeatedly:

s0 = digitalRead(10);

if  (s0 == LOW)
{warten = 250;}

else
{warten = 500;}

digitalWrite(9, HIGH);
delay(warten);
digitalWrite(9, LOW);
delay(warten);

}