#define  pinPIR 2
#define pinRelay 3
void setup(){
   pinMode(pinPIR, INPUT);
   pinMode(pinRelay,OUTPUT);
}

void loop() {
  int nilaiSwitch=digitalRead((pinPIR));
  if (nilaiSwitch==1){
   digitalWrite(pinRelay,HIGH);
  }
 else {
    digitalWrite(pinRelay,LOW);
}
}