// Define the pins for LED and PIR sensor
#define LED_PIN 13
#define PIR_PIN 2

void setup() {
  pinMode(LED_PIN, OUTPUT);      // Set the LED pin as output
  pinMode(PIR_PIN, INPUT);       // Set the PIR pin as input
}

void loop() {
  int pirValue = digitalRead(PIR_PIN);   // Read the PIR sensor

  if(pirValue == HIGH) {                 // If motion is detected
    digitalWrite(LED_PIN, HIGH);         // Turn ON the LED
  } else {                               // If no motion is detected
    digitalWrite(LED_PIN, LOW);          // Turn OFF the LED
  }
}