Design and Implementation of an Access Control System by Using Visible Light Key

During the pandemic, everyone is afraid to touch unsterilized items. Therefore, this design proposes a method that uses visible light LED as a key so that users can open the door without a physical key. They just use a smart phone or a flashlight equipped with a coding circuit. This photo E-lock system includes a light code detector, microprocessor, electronic lock and other modules. The encoded light can be used as a light key to open the door. In addition to being able to avoid touching the door handle, it can also avoid touching too many objects, so that users can feel convenient and relieved.