Embedded Hotel Safe System

A C++ based embedded security system featuring a Finite State Machine (FSM) architecture and hardware interrupt handling. This project simulates a dual-partition hotel safe with multi-level authentication and penalty logic. This project is developed for the EE321 Microprocessors course at Ozyegin University. Main goal was implementing real-time control logic and hardware interfacing using low-level microcontroller features.

Key Features

• FSM Architecture: Robust state management (Welcome, Locked, Time-out) prevents invalid transitions.
• Hardware Interrupts (ISR): Uses TIMER1 and direct register access for non-blocking security counters.
• Dual-Section Logic: Independent control for two separate safe compartments.
• Bait Password: Triggers a silent "Emergency LED" alarm while appearing to open the safe normally.
• Penalty System: Enforces a 20-second lockout after 3 consecutive failed attempts.

Tech Stack & Hardware

• Language: C++ (Arduino Framework)
• Microcontroller: ATmega328P (Arduino Uno/Nano)
• Components: 4x3 Keypad, 16x2 LCD, L293D Motor Driver, DC Motors.
• Concepts: Register Manipulation, Interrupt Service Routines, Finite State Machines.