int pirPin = 2;          // PIR sensor OUT pin connected to digital pin 2
int relayPin = 13;       // Relay connected to digital pin 13
unsigned long lastMotionTime = 0;  // Store the time of the last detected motion
const unsigned long motionTimeout = 180000;  // 5 minutes (180000 milliseconds)

void setup() {
  pinMode(2, INPUT);     // Set PIR pin as input
  pinMode(13, OUTPUT);  // Set relay pin as output
  digitalWrite(13, LOW);  // Initialize relay to off
  Serial.begin(9600);         // Begin serial communication for debugging
}

void loop() {
  int motionState = digitalRead(2);  // Read PIR sensor state
  unsigned long currentMillis = millis();  // Get the current time

  if (motionState == HIGH) {  // If motion is detected
    digitalWrite(13, HIGH);  // Turn on the relay (light)
    lastMotionTime = currentMillis;  // Update the time of the last motion
    Serial.println("Motion detected! Light ON");
  }

  // Check if 5 minutes have passed since the last motion detection
  if (currentMillis - lastMotionTime >= motionTimeout) {
    digitalWrite(13, LOW);  // Turn off the relay (light)
    Serial.println("No motion for 5 minutes. Light OFF");
  }

  delay(100);  // Small delay to avoid bouncing
}