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

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

void loop() {
  val = digitalRead(PIR);  // read input value
  Serial.println(val);
  delay(1000);
}