Design and construction of a smart lock system using Internet of Things (IoT)

Muhammed Abudu Aniru (Department of Electrical/Electronics, University of Benin, Benin City, Edo State, Nigeria)
Enoma Victor Osasenaga (Department of Electrical/Electronics, University of Benin, Benin City, Edo State, Nigeria)
Osamwonyi Efosa Emmanuel (Department of Electrical/Electronics, University of Benin, Benin City, Edo State, Nigeria)
Matthew Onyeka Gerald (Department of Electrical/Electronics, University of Benin, Benin City, Edo State, Nigeria)
Emede Oghenekome Melody (Department of Electrical/Electronics, University of Benin, Benin City, Edo State, Nigeria)

International Journal of Informatics, Information System and Computer Engineering (INJIISCOM)
Vol. 6 No. 1 (2025): INJIISCOM: VOLUME 6, ISSUE 1, JUNE 2025

This study designs and constructs an Internet of Things (IoT)-based smart door lock system to enhance home security and accessibility. Traditional manual lock systems are often slow, insecure, and highly vulnerable to breaches. The proposed system integrates a NodeMCU ESP8266 microcontroller, a solenoid lock, a 12V DC battery, a 5V buck converter (LM7805), a Wi-Fi module, and relay switches to offer a robust protection mechanism. Testing involved three independent devices across ten trials. In all trials, the system accurately interpreted remote commands and transmitted signals to the relay module, successfully triggering the solenoid lock mechanism. This confirms the system's effectiveness in providing secure, keyless, and automated remote access control.