Abstract
The essay proposed and introduced a visible light digital information communication system which uses white light of LED to be the medium, and is based on MCU. The essay introduced the working principle of the external circuit and the internal program of the communication system, and discussed the way to achieve the function of illuminate and signal interference problem between many illuminant. The research talked about the way to emission and received when the signal is transmitting. It also talked about relevant arithmetic and the method of modulate and demodulate, and disposed noise from signal. The communication system fulfills the task of illuminate, at the same time, transmits digital information at a short distance.
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