Combo Lock Verilog Implementation

This repository contains a Verilog implementation of a Combination Lock system using Finite State Machines (FSMs). The design includes modules for user input handling, state management, lock verification, and 7-segment display output.

Features

• Implements a combination lock system.
• Uses FSM-based logic for controlling lock states.
• Seven-segment display interface for lock status.
• Supports reset and change functionality.
• Includes separate modules for modular design.

Modules Overview

1. combo_lock.v

• Top-level module integrating all submodules.
• Connects user inputs (b1, b2, x) with FSMs and displays.

2. moore.v

• Implements a Moore finite state machine (FSM).
• Handles input processing for enter and change states.

3. comparison.v

• Compares user-entered combination with the stored code.
• Outputs match signal indicating success or failure.

4. lock.v

• Manages the lock/unlock logic.
• Controls open, alarm, and neww states based on user input.

5. hex7seg.v

• Drives a 7-segment display based on the lock status.
• Indicates whether the lock is open, incorrect, or ready for a new code.

State Diagrams

1. State Diagram for Input Conditioning

This diagram represents a rough sketch of the finite state machine for input conditioning. The input w determines the state transitions, and the output z reflects the current state behavior.

• State A: Initial state, z = 0.
• State B: Transitioned when w = 1, z = 1.
• State C: Transitioned when w = 0 again.

2. State Diagram of the Combination Lock

This diagram illustrates the detailed state transitions of the combination lock system. Inputs include Enter, Change, and Match, while outputs include Open, New, and Alarm.

• State A: Default state where the lock is closed.
• State B: State for reset operations.
• State C: State where the lock is open.
• State D: Alarm state triggered by incorrect attempts.
• State E: New code entry state.

Block Diagram

The following block diagram shows the high-level architecture of the combination lock system. Each module interacts to implement the required functionality:

• Moore FSMs: Handle input conditioning (Enter and Change).
• Comparison Module: Compares the entered code with the stored code.
• Lock Module: Manages lock states and outputs (Open, Alarm, New).
• Hex7seg Module: Drives the 7-segment display based on lock states.

Author

Waleed Malik (waleedmalik027@gmail.com) Aadil Rehan (aadilrehan02@gmail.com)