#define pinPIR 2
#define pinRelay 3
void setup() {
  pinMode(pinPIR, INPUT);
  pinMode(pinRelay, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  int nilaiSwitch = digitalRead((pinPIR));
  if(nilaiSwitch == 1){
    digitalWrite(pinRelay, HIGH);
    Serial.println("ada pergerakan");
  }
  else{
    digitalWrite(pinRelay, LOW);
    Serial.println("tidak ada pergerakan");
  }
}