w. eeprom

#include <EEPROM.h>          // Library to use EEPROM
#include "BluetoothSerial.h" // Library for Bluetooth communication
#include <ESP32Servo.h>      // Library for controlling servos

// Pin definitions
const int buttonPin = 2;     // Button to manually toggle lock/unlock
const int servoPin = 18;     // Servo motor pin
const int pushbutton = 17;   // Pushbutton for manual door control
const int indikator = 5;     // Indicator LED (on/off)
const int buzzerPin = 19;    // Buzzer for alerts
int state = 0;               // 0 = unlocked, 1 = locked
int lastButtonState = LOW;   // Previous button state
int buttonState;             // Current button state
int sw = 0;                  // Variable to track system on/off
bool IRSensor;               // Holds data from the infrared sensor
int sistem_aktif;            // Tracks if the system is active
int incoming;                // Bluetooth data holder

Servo servo;                 // Servo object for door control
BluetoothSerial ESP_BT;      // Bluetooth object

void setup() {
  // Initialize EEPROM, Bluetooth, and Servo
  ESP_BT.begin("Security_System");    // Bluetooth name
  servo.attach(servoPin, 550, 2400);  // Servo setup
  
  // Pin modes
  pinMode(buttonPin, INPUT);          // Button pin as input
  pinMode(pushbutton, INPUT_PULLUP);  // Pushbutton as input (manual door control)
  pinMode(indikator, OUTPUT);         // Indicator LED as output
  pinMode(2, INPUT);                  // Infrared sensor pin as input
  pinMode(buzzerPin, OUTPUT);         // Buzzer as output
  
  // Initialize system with saved state from EEPROM
  state = EEPROM.read(0); // Read saved state from EEPROM
  if (state == 1) {
    servo.write(180);     // Locked state
    sistem_aktif = 1;     // System is active
    digitalWrite(indikator, LOW);  // Turn on the indicator LED
  } else {
    servo.write(0);       // Unlocked state
    sistem_aktif = 0;     // System is inactive
    digitalWrite(indikator, HIGH); // Turn off the indicator LED
  }
}

void loop() {
  // Button to toggle lock/unlock (manual control)
  buttonState = digitalRead(buttonPin); // Read button state
  if (buttonState == HIGH && lastButtonState == LOW) {
    // Toggle lock/unlock state
    state = !state; // If locked, unlock and vice versa
    EEPROM.write(0, state); // Save the new state to EEPROM

    if (state == 1) {
      servo.write(180); // Lock the door
      sistem_aktif = 1; // Activate system
      digitalWrite(indikator, LOW); // Turn on the LED
    } else {
      servo.write(0);   // Unlock the door
      sistem_aktif = 0; // Deactivate system
      digitalWrite(indikator, HIGH); // Turn off the LED
    }
  }
  lastButtonState = buttonState; // Update last button state

  // Pushbutton manual control (second method)
  if (digitalRead(pushbutton) == 0 && sw == 0) {
    servo.write(180);         // Lock the door
    sistem_aktif = 1;         // Activate system
    digitalWrite(indikator, LOW); // Turn on LED
    sw = 1;                   // Set switch
    delay(1000);              // Delay for debounce
  } else if (digitalRead(pushbutton) == 0 && sw == 1) {
    servo.write(0);           // Unlock the door
    sistem_aktif = 0;         // Deactivate system
    digitalWrite(indikator, HIGH); // Turn off LED
    sw = 0;                   // Reset switch
    delay(1000);              // Delay for debounce
  }

  // Bluetooth control
  if (ESP_BT.available()) {
    incoming = ESP_BT.read(); // Read Bluetooth data
    if (incoming == '0') {    // Lock and enable system
      servo.write(180);       // Lock the door
      sistem_aktif = 1;       // Activate system
      digitalWrite(indikator, LOW); // Turn on LED
    } else if (incoming == '1') { // Unlock the door
      servo.write(0);         // Unlock the door
      sistem_aktif = 0;       // Deactivate system
      digitalWrite(indikator, HIGH); // Turn off LED
    }
  }

  // If the system is active and the infrared sensor detects an object
  if (sistem_aktif == 1) {
    IRSensor = digitalRead(2); // Read infrared sensor
    if (IRSensor == 0) { // If an object is detected
      digitalWrite(buzzerPin, LOW);  // Turn on buzzer
      delay(5000);                   // 5 second delay
      digitalWrite(buzzerPin, HIGH); // Turn off buzzer
    } else {
      digitalWrite(buzzerPin, HIGH); // Ensure buzzer is off
    }
  }
}