| The continuous development of LED lighting technology has gradually replaced the traditional incandescent lamp and fluorescent lamp and other lighting sources,with green environmental protection,low power consumption,energy saving,reliable,long service life and other characteristics,is a new type of green light source.Visible light communication technology is the use of LED light source,with both lighting and wireless copper wire function,is a green wireless communication technology.In this paper,the audio transmission system based on visible light is studied.The audio signal is sampled and converted into digital audio signal.After modulation,the LED is driven to transmit visible light signal.The receiver detects the optical signal,decodes and restores the audio signal to complete the audio transmission.The main research work includes:1)Analyze the related technology of visible light communication,and study the LED luminous principle,volt-ampere characteristic,modulation characteristic,communication mode and modulation method of visible light communication.2)The audio transmission system of visible light is designed by using MSP430G2553 MCU.The transmitter and receiver of visible light audio communication are designed,including the minimum system of MSP430G2553,LED driving circuit,audio acquisition circuit,visible light receiving circuit,DA conversion circuit and power amplifier circuit.Design PCB board,proofing welding circuit,and build visible light audio transmission system.3)MSP430G2553 is programmed,UART serial communication program is designed to realize OOK modulation and demodulation of visible light communication,ADC program is designed to realize audio acquisition,and the function of the whole system is realized by programming.4)Finally,the audio transmission system of visible light is tested.The test results show that the audio transmission can be completed and the transmission distance can reach 1 m,which confirms the feasibility of the whole system design. |
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