#define saklar 13
#define relay 15

void setup() {
  // put your setup code here, to run once:
  pinMode(saklar, INPUT);
  pinMode(relay, OUTPUT);
}

void loop() {
  if (digitalRead(saklar)==HIGH)
  {
    digitalWrite(relay, HIGH);
  }
  if (digitalRead(saklar)==LOW)
  {
    digitalWrite(relay, LOW);
  }
}