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

This paper aims to design and construct a smart door lock system using the Internet of Things (IoT), WiFi module, relay module and other peripheral devices to provide people with an incomparable level of control and accessibility over their home’s entry points. Traditional door lock systems are slow, insecure and with high vulnerability and they require human intervention to lock and unlock them. Thus, an IoT-based smart door lock system offers a proper lock protection mechanism with better performance. The system comprises a microcontroller (NodeMCU ESP8266), solenoid lock, DC battery(12V), 5V 3A buck converter (LM7805), WiFi module and a switching device (Relays). The setup of the system was tested with 3 independent devices for 10 trials. All of the trials accurately interpreted the received commands and transmitted the corresponding signals to the interfaced relay module. Subsequently, the relay module effectuated the lock/unlock operation on the integrated solenoid lock mechanism, thus accomplishing the intended objective of the study.