Door Locker Security System based on ATmega32

Objective:

Develop a door locker security system using two ATmega32 microcontrollers to unlock a door with a password, designed with a layered architecture.

System Overview:

The system consists of two main components:

1. HMI_ECU (Human Machine Interface ECU): Manages user interaction with a 2x16 LCD and a 4x4 keypad.
2. Control_ECU: Handles password processing, door control using a DC motor, alarm activation via a buzzer, and data storage in EEPROM.

Key Features:

1. Password Setup and Confirmation:
   • User enters a 5-digit password twice for confirmation.
   • HMI_ECU sends the passwords to Control_ECU via UART for verification and storage in EEPROM.
2. Password Verification:
   • User inputs the password to unlock the door or change the password.
   • Password verification is done by Control_ECU.
   • Incorrect passwords prompt re-entry, with the system locking after three consecutive failures and activating a buzzer.
3. Door Operation:
   • On correct password entry, the DC motor rotates to unlock and lock the door with status messages displayed on the LCD.

Hardware Components:

• ATmega32 Microcontrollers: Two units operating at 8 MHz.
• 2x16 LCD: Displays messages and prompts.
• 4x4 Keypad: User input for passwords.
• DC Motor: Controls the door locking mechanism.
• EEPROM: Stores the system password.
• Buzzer: Alerts on incorrect password attempts.

Software Components:

1. GPIO Driver: Manages input/output operations for both ECUs.
2. ICU Driver: Configures and handles interrupts.
3. LCD Driver: Interfaces with the LCD for displaying messages.
4. Keypad Driver: Reads user inputs from the keypad.
5. DC Motor Driver: Controls motor operations for door locking.
6. EEPROM Driver: Manages password storage and retrieval.
7. I2C Driver: Facilitates communication between Control_ECU and EEPROM.
8. UART Driver: Enables communication between HMI_ECU and Control_ECU.
9. Timer Driver: Manages timing functions for motor operations and display messages.
10. Buzzer Driver: Controls the buzzer for alert signals.

System Sequence:

1. Password Creation:
   • User enters and confirms a 5-digit password.
   • Passwords are sent to Control_ECU for verification and storage.
2. Main Options:
   • User selects between unlocking the door or changing the password.
3. Open Door:
   • User enters the password.
   • Correct password triggers door unlocking and subsequent locking, with motor control and LCD messages.
4. Change Password:
   • User enters the current password.
   • On correct entry, the user is prompted to set a new password.
5. Error Handling:
   • Incorrect password entry allows two more attempts.
   • Three consecutive failures trigger the buzzer and lock the system for one minute.

Driver Requirements:

1. GPIO Driver: Used in both ECUs.
2. LCD Driver: Connects to HMI_ECU, supports 2x16 LCD in 8-bit or 4-bit mode.
3. Keypad Driver: Connects to HMI_ECU.
4. DC Motor Driver: Connects to Control_ECU, uses Timer0 PWM for speed control.
5. EEPROM Driver: External, connects to Control_ECU via I2C.
6. I2C Driver: Used in Control_ECU for EEPROM communication.
7. UART Driver: Used for ECU-to-ECU communication.
8. Timer Driver: Used in both ECUs for timing operations.
9. Buzzer Driver: Connects to Control_ECU for alert signals.

This system ensures secure and user-friendly door access control with a robust layered architecture and modular driver implementation.