// Pin Definitions
const int pirPin = 2;   // PIR sensor output pin
const int ledPin = 3;   // LED output pin
const int buzzerPin = 4; // Buzzer output pin
const int buttonPin = 5; // Button pin
bool detectionEnabled = false; // To track if detection mode is active

void setup() {
  pinMode(pirPin, INPUT);   // PIR sensor pin as input
  pinMode(ledPin, OUTPUT);  // LED pin as output
  pinMode(buzzerPin, OUTPUT); // Buzzer pin as output
  pinMode(buttonPin, INPUT_PULLUP); // Button pin as input with internal pull-up
  Serial.begin(9600);       // Initialize serial communication (optional for debugging)
}

void loop() {
  // Check if the button is pressed to start detection
  if (digitalRead(buttonPin) == LOW) {
    detectionEnabled = true; // Enable detection
    Serial.println("Detection mode enabled!"); // Optional debug message
    delay(500); // Debounce delay
  }

  if (detectionEnabled) {
    int pirState = digitalRead(pirPin); // Read PIR sensor state

    if (pirState == HIGH) {
      // Movement detected, activate LED and Buzzer
      digitalWrite(ledPin, HIGH);     // Turn on LED
      digitalWrite(buzzerPin, HIGH);  // Turn on Buzzer
      Serial.println("Motion detected!"); // Optional debug message
      delay(500); // Keep LED and Buzzer on for 500ms
    } else {
      // No movement, turn off LED and Buzzer
      digitalWrite(ledPin, LOW);      // Turn off LED
      digitalWrite(buzzerPin, LOW);   // Turn off Buzzer
    }
  }
}