// Pin Definitions
#define DOORBELL_PIN 4     // Push button (doorbell)
#define BUZZER_PIN 5       // Buzzer
#define LED_PIN 2          // LED
#define PIR_PIN 14         // PIR Motion Sensor

void setup() {
  Serial.begin(115200);

  // Set pin modes
  pinMode(DOORBELL_PIN, INPUT_PULLUP);   // Button as input with pull-up resistor
  pinMode(BUZZER_PIN, OUTPUT);           // Buzzer as output
  pinMode(LED_PIN, OUTPUT);              // LED as output
  pinMode(PIR_PIN, INPUT);               // PIR sensor as input

  Serial.println("Smart Doorbell System Ready");
}

void loop() {
  // Check if doorbell button is pressed
  if (digitalRead(DOORBELL_PIN) == LOW) {
    Serial.println("Doorbell Pressed!");

    // Turn on LED and buzzer
    digitalWrite(LED_PIN, HIGH);
    digitalWrite(BUZZER_PIN, HIGH);
    delay(1000);  // Buzzer sounds for 1 second
    digitalWrite(BUZZER_PIN, LOW);
    digitalWrite(LED_PIN, LOW);

    // Debounce delay
    delay(1000);
  }

  // Check if motion is detected by PIR sensor
  if (digitalRead(PIR_PIN) == HIGH) {
    Serial.println("Motion Detected!");

    // Turn on LED as a visual indicator
    digitalWrite(LED_PIN, HIGH);
    delay(3000);  // Keep LED on for 3 seconds
    digitalWrite(LED_PIN, LOW);
  }
}