🔐 Arduino Security System

An Arduino-based smart security system with RFID access control, flame and sound sensors, buzzer alert, and LCD feedback.

📽️ Demo Video

🔊 Note: Turn on your volume when watching the demo!

Arduino.Security.System.mp4

📐 Schematics

🔧 Pre-requisites – Components Used

• Arduino UNO
• RFID-RC522 Module
• 16x2 LCD Display (with potentiometer)
• Flame sensor
• Sound sensor
• Active buzzer
• Red and green LEDs
• Jumper wires
• Breadboard
• 5V USB or external power supply

⚙️ Setup and Build Plan

• Connect the LCD to digital pins 7-2
• Connect RFID module via digital pins 13-9
• Use A0 and A3 for the flame and sound sensors
• A4: buzzer, A5: red LED, D8: green LED
• Use a potentiometer to calibrate LCD's contrast
• Calibrate sensor thresholds in code as needed
• Upload the sketch via Arduino IDE and monitor via Serial

🚨 Behavior

• System starts in UNLOCKED state
• Scanning the correct tag toggles LOCKED/UNLOCKED, scanning an unauthorized tag will not lock the system
• Flame or sound detection in LOCKED mode triggers persistent alarm
• Flame detection in UNLOCKED mode only activates buzzer temporarily

✅ Result

• Full interaction and real-time responses between components
• Clear state transitions and intuitive user feedback
• All logic and thresholds handled within a structured Arduino sketch

📁 Files

• security_system.ino: Arduino source code