Android Based Double Authentication Security System

This project focuses on creating a secure access control system using double authentication through an Android-based application and embedded hardware. Traditional door locking systems are vulnerable as they rely on a single control method. In this system, the first level of authentication is done by sending a password from an Android app to the door system via Bluetooth using the HC-05 module. Once the primary password is successfully verified by the Arduino microcontroller, the system prompts for a second level of authentication. This involves entering a one-time password (OTP) using a 1×4 keypad. Only when both the Android password and the keypad input are correct does the system allow access, which is indicated by a servo motor unlocking the door. The system components include Arduino Uno, Bluetooth module HC-05, servo motor, keypad, and a 16×2 LCD display. This double authentication method offers enhanced security and is suitable for homes, offices, and restricted areas.