void setup() {
  // put your setup code here, to run once:
 Serial.begin(9600); //9600 bits / sek -> baud
 pinMode(4, OUTPUT);
 pinMode(15, OUTPUT);
 pinMode(25, INPUT);
 pinMode(26, INPUT);
}

void loop() {
  int taster1 = digitalRead(25);
  int taster2 = digitalRead(26);
  Serial.print("Taster 1: ");
  Serial.print(taster1);
  Serial.print("      Taster 2: ");
  Serial.println(taster2);
  if(taster1 == 0) {
    digitalWrite(4, HIGH);
  }
else{
  digitalWrite(4, LOW);
}
if(taster2 == 0){
  digitalWrite(15, HIGH);
}
else{
  digitalWrite(15, LOW);
}
  delay(100); // this speeds up the simulation
}