🔐 STM32 FreeRTOS Password Authentication System

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📌 Overview

This project implements a Password Authentication System using FreeRTOS on an STM32F407 Discovery Board. It uses a 4x4 Keypad, I2C LCD, and a Servo Motor for lock/unlock operations. The system supports two modes:

• NORMAL → Password validation
• UPDATE → Change password stored in Flash

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✅ Features

• FreeRTOS multitasking with dedicated tasks
• Keypad input with debounce
• LCD feedback using I2C
• Servo lock/unlock mechanism
• Flash memory integration for password persistence
• Toggle modes using # key

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🛠 Hardware Requirements

• STM32F407 Discovery (or compatible STM32 board)
• 4x4 Matrix Keypad
• 16x2 I2C LCD
• SG90 Servo Motor
• Breadboard, jumper wires, 5V power supply

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🔄 How It Works

1. At startup, password is loaded from Flash.
2. User enters password via 4x4 keypad.
3. # key toggles between NORMAL and UPDATE modes.
4. NORMAL Mode → Validates password and locks/unlocks servo.
5. UPDATE Mode → Accepts new password and stores it in Flash.
6. LCD provides real-time feedback.

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🔧 Tools & Software

• STM32CubeIDE
• FreeRTOS
• STM32 HAL Drivers
• HD44780 I2C LCD Library

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🚀 Future Improvements

• Add IoT control (Wi-Fi/Bluetooth)
• Password encryption
• Implement binary semaphore for shared resources in complex systems

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✨ Author

Vasanth Nayak
Embedded Systems Developer | RTOS Enthusiast