International Journal of Scientific Research and Engineering Development

Security of residential and commercial premises has become a major concern due to increasing incidents of unauthorized access, theft, and security breaches. Traditional mechanical locking systems suffer from several drawbacks such as key duplication, loss of keys, lack of access control, and absence of monitoring facilities. Although modern smart locks provide enhanced security, many of them rely heavily on continuous internet connectivity, making them unreliable during network failures. This project presents the design and implementation of a Smart Door Lock System with Multi-Level Authentication using the ESP32 microcontroller. The proposed system enhances security by integrating three authentication layers: Touch pattern authentication, RFID-based verification, and IR sensor-based presence detection. The touch pattern acts as the first level of security, allowing users to define a custom tap sequence stored securely in EEPROM. Upon successful pattern verification, RFID authentication is enabled, ensuring that only authorized RFID cards can proceed further. Finally, an IR sensor detects human presence near the door, preventing accidental or unauthorized unlocking. A servo motor is used as the physical locking mechanism, providing precise and controlled locking and unlocking of the door. The system operates completely offline for authentication, ensuring uninterrupted security even during internet failure, while Wi-Fi is used only for optional web-based monitoring and control. Experimental results demonstrate reliable performance, fast response time, low power consumption, and cost-effective implementation. The system is suitable for homes, offices, and restricted areas requiring enhanced access control.

Bhagyesh Pawar, Vaibhav Deore, Tushar Savkar, Mrs. Y. R. Thakare,"Smart Door Lock System with Multi-Level Authentication" International Journal of Scientific Research and Engineering Development, V9(1): Page(393-398) Jan-Feb 2026. ISSN: 2581-7175. www.ijsred.com. Published by Scientific and Academic Research Publishing.