Dual Microcontroller-Based Door Locker Security System Using Password Authentication

The objective of this project is to develop a secure and efficient smart door control system. It

uses two microcontrollers, HMI_ECU and Control_ECU, which communicate via UART. The

system implements password authentication, stores data in external EEPROM, and integrates

additional components such as a PIR sensor, H-bridge motor control, and a buzzer for

enhanced functionality.

Project Overview:

This smart door control system is designed with two microcontrollers, one acting as the

Human-Machine Interface (HMI_ECU) and the other as the Control Unit (Control_ECU). Users

interact with the system using an LCD and keypad to enter passwords, which are verified and

stored using external EEPROM. The door is controlled by an H-bridge circuit connected to a

motor, and the system includes a PIR sensor for motion detection, a buzzer for alarms, and

password-protected access to system options like door unlocking and password changing.

Features:

1. Password Protection: Users can set and verify a password stored in external EEPROM.

2. LCD and Keypad Interface: Allows easy interaction for entering and managing

passwords.

3. UART Communication: HMI_ECU sends and receives data to and from Control_ECU via

UART.

4. EEPROM Storage: Passwords and system data are stored securely in an external

EEPROM.

5. Motorized Door Control: The door is unlocked/locked using a motor driven by an H-

bridge.

6. Buzzer Alert: The buzzer is activated for failed password attempts and system alerts.

7. PIR Motion Sensor: Detects motion to trigger door operations.

8. Password Change Option: Users can change the password after verification.

9. Security Lock: System locks for one minute if the password is entered incorrectly three

times consecutively.