#define DOOR_PIN 15
#define BUZZER_PIN 4
#define LED_PIN 2

bool doorOpened = false;

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

  pinMode(DOOR_PIN, INPUT_PULLUP);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(LED_PIN, OUTPUT);

  digitalWrite(BUZZER_PIN, LOW);
  digitalWrite(LED_PIN, LOW);

  Serial.println("Smart Door Alert System Started");
}

void loop() {
  int doorState = digitalRead(DOOR_PIN);

  // Door Open
  if (doorState == HIGH && !doorOpened) {
    doorOpened = true;

    digitalWrite(BUZZER_PIN, HIGH);
    digitalWrite(LED_PIN, HIGH);

    Serial.println("🚨 ALERT: Door Opened!");
  }

  // Door Closed
  if (doorState == LOW && doorOpened) {
    doorOpened = false;

    digitalWrite(BUZZER_PIN, LOW);
    digitalWrite(LED_PIN, LOW);

    Serial.println("Door Closed. System Reset.");
  }

  delay(100);
}