//program relay
#define pinSwitch 2
#define pinRelay 2
void setup() {
      pinMode(pinSwitch, INPUT_PULLUP);
    pinMode(pinRelay, OUTPUT);
}

void loop() {
  int nilaiSwitch=digitalRead ((pinSwitch));
if (nilaiSwitch == 0){
  digitalWrite(pinRelay, HIGH);
}
else {
  digitalWrite(pinRelay,LOW);
}
}