// Define pin numbers
const int motionSensorPin = 2;  // Pin connected to the OUT of the PIR sensor
const int ledPin = 13;          // Pin connected to the anode of the LED
const int buzzerPin = 12;       // Pin connected to the positive terminal of the buzzer

// Define timing variables
unsigned long motionDetectedTime = 0;  // To store the time when motion was last detected
const unsigned long delayDuration = 30000;  // 30 seconds delay duration

// Define the states
bool ledState = false;       // Track the current state of the LED
bool motionDetected = false; // Track whether motion is detected

void setup() {
  pinMode(motionSensorPin, INPUT);  // Set PIR sensor pin as input
  pinMode(ledPin, OUTPUT);          // Set LED pin as output
  pinMode(buzzerPin, OUTPUT);       // Set buzzer pin as output
  digitalWrite(ledPin, LOW);        // Ensure LED is off initially
  digitalWrite(buzzerPin, LOW);     // Ensure buzzer is off initially
}

void loop() {
  int motionState = digitalRead(motionSensorPin);  // Read the state of the PIR sensor
  
  if (motionState == HIGH) {
    // Motion detected
    if (!motionDetected) {
      // If motion was not previously detected, turn on the LED and beep the buzzer
      digitalWrite(ledPin, HIGH);
      digitalWrite(buzzerPin, HIGH);  // Turn on the buzzer
      delay(100);                     // Keep the buzzer on for 100 milliseconds
      digitalWrite(buzzerPin, LOW);   // Turn off the buzzer
      ledState = true;                // Update LED state
      motionDetected = true;          // Update motion detected flag
      motionDetectedTime = millis();  // Record the time of detection
    }
  } else {
    // No motion detected
    motionDetected = false;  // Update motion detected flag
  }

  // Check if 30 seconds have passed since motion was last detected
  if (ledState && (millis() - motionDetectedTime >= delayDuration)) {
    digitalWrite(ledPin, LOW);   // Turn off the LED
    ledState = false;           // Update LED state
  }
}