Visible light communication using the flash of smartphone cameras for access control application
Abstract
Computer security is delving into new fields, and short distance communication by light is one of them due to its advantages over traditional means that use radio frequency. A few advantages are not reading from a close distance, operating only when the user requires it, and short-range communication that is ideal for security applications and access control. This paper presents the development in the access control prototype with smartphones using light communication. Diverse sensors and flash response speeds were evaluated with physical tests in several cell phones; the same minimum response frequency of 60 Hz was obtained for different devices, and depending on the device, a maximum response of 140 Hz was obtained. Using this information, an app was developed on the Flutter platform to send data frames implementing protocols like infrared, where the signal is encoded with the flash camera’s pulse-width modulation. Using an embedded system known as ESP8266 WeMos D1 Mini, data bytes could be sent, received, synchronized, and verified from the cell phone at a frequency of 30 Hz modulation per bit.
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