Design and Development of a Password-Based  Door Lock System Using Microcontroller and  Electromechanical Solenoid

Author(s)	Mr. Sujit Murlidhar Rohokale, Pravin Gawande, Shreyas Kale, Sumant Umardand, Himanshu Sali
Country	India
Abstract	This paper presents the design and implementation of a low-cost, reliable electronic door locking system driven by an 8052 microcontroller and secured through password-based authentication. The proposed solution features a 4×4 matrix keypad for user input, a 16×2 character LCD for real-time feedback, and a magnetic solenoid lock actuated via a relay-driven interface with embedded fail-safe mechanisms. The system operates in a multi-state logic structure with clearly defined idle, authentication, and access phases. Extensive validation confirms a 99.2% success rate across 1,000 authentication trials, with an average system response time of 470 milliseconds. A three-level security mechanism with configurable lockout thresholds enhances protection against brute-force attacks. Energy consumption remains optimized at 1.8W during active use. When compared to off-the-shelf alternatives, the proposed setup offers a 58% reduction in cost and significantly improved customization flexibility, making it well-suited for domestic and small commercial applications.
Keywords	microcontroller, access control, password security, solenoid actuator, embedded system, fail-safe locking
Field	Engineering
Published In	Volume 7, Issue 3, May-June 2025
Published On	2025-05-16
DOI	https://doi.org/10.36948/ijfmr.2025.v07i03.44813

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