// Declare the variables
int pirPin = 14;            // PIR sensor output pin
int lightPin = 13;          // Relay or LED pin
unsigned long motionDetectedTime = 0;  // Time when motion was last detected
unsigned long delayTime = 30000;       // Delay (30 seconds) before turning off lights
bool lightOn = false;                  // Track the light state (on/off)

void setup() {
  // Initialize serial monitor for debugging
  Serial.begin(115200);
  
  // Set up PIR sensor and light pin modes
  pinMode(pirPin, INPUT);
  pinMode(lightPin, OUTPUT);
  
  // Start with lights off
  digitalWrite(lightPin, LOW);
}

void loop() {
  // Read the PIR sensor
  int pirState = digitalRead(pirPin);

  if (pirState == HIGH) {  // Motion detected
    Serial.println("Motion detected!");
    
    // Turn on the light if it's not already on
    if (!lightOn) {
      digitalWrite(lightPin, HIGH);  // Turn on the light (activate relay or LED)
      lightOn = true;                // Update light state
    }
    
    // Update the last motion detected time
    motionDetectedTime = millis();
  }

  // Check if it's time to turn off the lights
  if (lightOn && (millis() - motionDetectedTime > delayTime)) {
    Serial.println("Turning off lights...");
    digitalWrite(lightPin, LOW);  // Turn off the light
    lightOn = false;              // Update light state
  }

  delay(100);  // Small delay for debouncing the PIR sensor
}