#define PIR_PIN 2   // PIR sensor OUT pin
#define LED_PIN 3   // LED pin

void setup() {
  pinMode(PIR_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  int motion = digitalRead(PIR_PIN);
  if (motion == HIGH) {
    Serial.println("Motion detected!");
    digitalWrite(LED_PIN, HIGH);
  } else {
    digitalWrite(LED_PIN, LOW);
  }
  delay(500);
}