| Summary: | 碩士 === 國立高雄應用科技大學 === 電子工程系碩士班 === 101 === High-speed switching capability of Light Emitting Diode (LED) conducts the data communication in light. In this thesis, an entrance control system is investigated and developed to validate the feasibility VLCID application in entrance control systems. In this thesis, short-distance light communication technology and embedded system technology are involved to develop a new entrance control system with light keys. The new entrance control system based on short-distance light communication to authenticate the specific light key by the exchange of confidential data between the light key and the entrance. LED and photodiode are the basic components to build the short-distance light communication. The large bandwidth of light communication enables a high speed confidential data exchange that is sufficient to secure the entrance control system. The goal of this research is to build a high secuirty, high scalability and convenient entrance control system to improve the shortages of the traditional entrance control system with metal keys. Light key modules and door modules support each number can be overridden with the system size of the EEPROM.
The system bottleneck depends on MCU processing speed and reaction speed of passive components. The components will affect the system response speed modulation demodulation time.With fast photodiode response, fast LED rising time, the modulation speed will be faster to operate the entrance control system. The experimental results show that two-way VLC transmission is feasible and high efficiency in the application of the entrance control system and prove the advances of the light key in improving the security, insufficiency and inconvenience of traditional keys than ever.
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