int PIR = 2;               // choose the input pin (for PIR sensor)
int val = 0;               // variable for reading the pin status
#define LED 5

void setup() {
  Serial.begin(9600);
  pinMode(PIR, _);     // declare sensor as input
  pinMode(LED, _);
}

void loop() {
  val = digitalRead(PIR);  // read input value
  Serial.println(val);
  _ (val == 0)
    digitalWrite(LED, _); //หลอดไฟติด
  _
    digitalWrite(LED, _); //หลอดไฟดับ
  delay(1000);
}