DESIGN AND CONSTRUCTION OF A SMART LOCK SYSTEM USING INTERNET OF THINGS

ABSTRACT

This project aims to develop an innovative smart door lock system that leverages the power of the Internet of Things (IoT) to provide users with an unparalleled level of control and accessibility over their home's entry points. Utilizing the versatile NodeMCU ESP8266 microcontroller and a Wi-Fi module, the proposed system offers a seamless integration with smartphone devices, enabling users to monitor and operate their door locks remotely. The project is built around a NodeMCU ESP8266 microcontroller interfaced with a relay module, voltage regulator circuits, and a solenoid lock, powered by a 12V DC battery supply. A 5V 3A buck converter IC7805 regulates the 12V from the battery to 5V for the NodeMCU, which integrates a WiFi module. The NodeMCU receives lock/unlock commands from a smartphone application and relays them to the relay module, which in turn controls the solenoid lock mechanism, enabling remote access control and enhancing security through IoT technology The developed smart door lock system successfully demonstrated the capability to receive commands from a smartphone device and relay them to the NodeMCU microcontroller. The NodeMCU accurately interpreted the received commands and transmitted the corresponding signals to the interfaced relay module. Subsequently, the relay module effectuated the lock or unlock operation on the integrated solenoid lock mechanism, thus accomplishing the intended objective of the study.