🔐 Digital Lock System

📌 Overview

The Digital Lock System is a digital logic design project that simulates a secure 4-digit password-based lock. The system verifies user input using combinational and sequential logic, granting access only when the correct password is entered.

🎯 Objective

To design and implement a digital system that:

• Accepts a 4-digit password via input switches/keypad
• Stores inputs using flip-flops
• Compares input with a preset password
• Activates an LED upon successful verification

⚙️ How It Works

1. Input: User enters a 4-digit password (0–9).
2. Encoding: Each digit is converted to 4-bit binary.
3. Storage: D Flip-Flops store the entered digits sequentially.
4. Comparison: XNOR gates compare input with the preset password.
5. Validation: AND gates verify full match.
6. Output: LED turns ON if the password is correct.

🧩 Components Used

• D Flip-Flops (Sequential Logic)
• XNOR Gates (Bitwise Comparison)
• AND Gates (Validation Logic)
• BCD to Binary Encoder
• Clock Signal (CLK)
• Input Switches / Keypad
• LED (Output Indicator)

✅ Features

• Simple and efficient design
• Real-time password verification
• Modular (can be extended to more digits)
• Educational demonstration of digital logic

📚 Applications

• Electronic door locks
• Secure lockers and safes
• Lab access systems
• Teaching digital electronics concepts

👨‍💻 Team Members

• Muhammad Hassan (F24608010)
• Muhammad Abdullah Tahir (F24608011)
• Muhammad Hassan Khawaja (F24608030)
• Muhammad Rehan Ranjha (F24608041)
• Muhammad Zia ur Raheem (F24608048)

📅 Date

June 03, 2025

---