Mobile Controlled Home

Mobile Controlled Home (AVR-ATmega32 Proteus Simulation)

Description:

The system allows controlling the home by mobile phone application through Bluetooth.

Two subsystems are implemented; a Safety door that could be opened by the mobile application by entering the user name and password, and a light on/off that could also be controlled by the mobile phone.

The system supports 5 users with different names and passwords, and uses an external EEPROM to read and save users' data.

In case of entering the username and password 3 times wrong, the system should give an alarm.

After powering on and initialization, the system enters the login state.

Login interface:

• The program asks the user to enter a username and password, and checks if it matches any user that is saved in the EEPROM.
• If the user entered a wrong username or password 3 times, the system is locked for 10 seconds, and a siren sound is generated from the buzzer using PWM, then the system is unlocked again after 10 seconds.
• If the user entered "MASTER" as a username and password, the system enters the "Master User" state.
• If the user entered a correct username and password, the system enters the "Normal User" state.

Master User interface:

• Master interface manages the users in the system and updates the data on the EEPROM.
• It has 3 options,
  1. Add User: Adds a new user to the system
  2. Edit User: Edits an existing user
  3. Remove User: Removes an existing user from the system
  4. Exit: Exits master user interface and returns to login interface

Normal User interface:

• Normal interface controls the door and lights in the home.
• The user can choose from 5 commands
  1. led on: Turns the lights on
  2. led off: Turns the lights off
  3. door open: Opens the door
  4. door close: Closes the door
  5. logout: Exits normal user interface and returns to the login interface

Project Design:

The project is based on Layered Architecture and operates on a State Machine inside a Super Loop.

Peripherals used:

1. DIO: Used for controlling GPIO pins.
2. Timer0: used in PWM mode to create a siren sound from the buzzer
3. Timer1: Used in PWM mode to control the servo motor
4. Timer2: Used in normal mode for generating delays in the system
5. TWI (I2C): Used for interfacing with the EEPROM
6. UART: Used for interfacing with the Bluetooth module

Files:

• Application Layer:

  1. Master_User: Provides the master user interface
  2. Normal_User: Provides the master user interface
  3. Password_Check: Contains functions responsible for password-checking mechanisms
  4. String_Functions: Contains functions that help in dealing with strings
  5. User_Management: Contains functions that manage all the users in the system.

• Hardware Abstraction Layer:

  1. Bluetooth_Module: Driver for HC-05 Bluetooth module and is used for interfacing with mobile phone
  2. EEPROM: Driver for ST24C08 EEPROM and is used to read and write data from and to the EEPROM
  3. SERVO: Driver used to control the servo motor
  4. SIREN: Driver used to make a siren sound from the buzzer

• Hardware Abstraction Layer:

  1. DIO: Driver used to control the GPIO pins
  2. GIE: Driver used to control the global interrupt enable for the MCU
  3. PWM: Driver used for controlling timers 0/1/2 in PWM mode
  4. TMR: Driver used for controlling timers 0/1/2 in normal mode
  5. TWI: Driver used for interfacing with the I2C peripheral
  6. UART: Driver used for interfacing with the UART peripheral

• Service Layer:

  1. BIT_MATH: Contains bit-wise operations
  2. STD_TYPES: Contains all the data types used

Project design: