Arduino-based-Smart-Password-Look-System

An Arduino-based smart door lock that uses a 4×3 keypad and a 16×2 LCD to authenticate users using a five-digit password.

Features

• 5-digit password authentication
• Password hidden with '*'
• LCD user interface
• Servo motor door lock
• Green LED for successful access
• Red LED for incorrect password
• Backspace function using '*'
• Automatic door relocking
• Audible feedback using speaker

Components Used

• Arduino Uno
• 4×3 Keypad
• 16×2 LCD
• SG90 Servo Motor
• Red LED
• Green LED
• Active Speaker
• Jumper Wires

Software Used

• Arduino IDE
• Proteus 8 Professional

How It Works

1. User enters a five-digit PIN.
2. Characters are displayed as '*'.
3. If the password is correct:
   • Green LED turns on.
   • Servo unlocks the door.
   • LCD displays "Access Granted".
4. If the password is incorrect:
   • Red LED turns on.
   • LCD displays "Incorrect PIN".
5. The system automatically returns to the PIN entry screen.

Future Improvements

• RFID authentication
• Fingerprint sensor
• Facerecognition feature
• EEPROM password storage
• Three-attempt lockout
• Mobile application control

Author

Amba Etta Computer Engineering Student | Embedded Systems Engineer