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자료유형
학술저널
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한국광학회 Current Optics and Photonics Current Optics and Photonics Vol.1 No.2
발행연도
2017.4
수록면
90 - 94 (5page)

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Visible light identification (VLID) is a user identification system for a door lock application usingsmartphone that adopts visible light communication (VLC) technology with the objective of high security,small form factor, and cost effectiveness. The user is verified by the identification application programof a smartphone via fingerprint recognition or password entry. If the authentication succeeds, thecorresponding encoded visible light signals are transmitted by a light emitting diode (LED) camera flash. Then, only a small size and low cost photodiode as an outdoor interface converts the light signal to thedigital data along with a comparator, and runs the authentication process, and releases the lock. VLIDcan utilize powerful state-of-the-art hardware and software of smartphones. Furthermore, the door locksystem is allowed to be easily upgraded with advanced technologies without its modification andreplacement. It can be upgraded by just update the software of smartphone application or replacing thesmartphone with the latest one. Additionally, wireless connection between a smartphone and a smart homehub is established automatically via Bluetooth for updating the password and controlling the home devices. In this paper, we demonstrate a prototype VLID door lock system that is built up with LEGO blocks,a photodiode, a comparator circuit, Bluetooth module, and FPGA board.

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