Design and Implementation of Smart Door Lock System Using IoT

In the ever-evolving field of mechatronics control systems, smart door lock system presents a unique opportunity to explore the integration of various technologies for intelligent access control. The system employs cutting-edge technologies like automatic face detection within a closed-loop framework, while also offering a manual verification option through an open-loop. The system's core is an ESP32 (NodeMCU) microcontroller, which coordinates all operations. The ESP32 CAM is equipped with image processing capabilities, allowing it to directly analyze the camera feed and identify authorized faces. If a recognized face is detected, the loop control program within the ESP32 automatically triggers the solenoid valve actuator, granting access. If any person is standing for a long time on the door, an alarm will ring and the owner will receive a Short Message Service (SMS) followed by a call. Thus, the proposed system is cost-effective (costing only 37% of the existing models with Raspberry Pi), reliable and energy efficient solution for the smart door lock system.