基于51单片机的LED可见光点对点通信实验研究

An Experimental Research on Point-to-Point Communication of LED Visible Light Based on 51 Microcontroller

可见光通信技术是一种新型带宽无线通信技术,其采用发光二极管(LED)作为光源,利用LED灯光承载的高速明暗闪烁信号来传输信息。根据可见光通信原理,基于51单片机提出一种LED可见光通信系统设计方案。该系统采用点对点的定向视距链路通信方式,发射端选用OOK-NRZ脉冲调制方式对LED发光阵列进行调制并发送信号,接收端采用光强度调制-直接检测技术对接收信号进行解调,然后通过1602字符型液晶显示器显示接受信息。实验中,系统在30cm距离范围内,可以实现基本英文字符的发送、接收与显示。实验结果表明,该系统能够通过可见光实现简单的单工数据通信功能,具有低成本、低功耗及体积小等优点。

Visible light communication technology is a new kind of bandwidth wireless communication technology, which uses light-emitting diode（LED） as light source, the information transmitted by high-speed flash signals carried by white LED. According to the theory of the visible light communication and based on 51 single chip microcomputer, a design scheme of LED visible light communication system is put forward. The system uses the communication mode based on point-to-point directional line-of-sight link.The transmitter chooses OOK-NRZ pulse modulation mode to modulate the LED array and transmit signals,and the receiver demodulates the received signal through the light intensity modulated-direct detection technology, and then the received information will be displayed on the 1602 character-type LCD. In experiments, system can send, receive and display basic English characters within the range of 30 cm. The experimental results indicate that the system is able to achieve the function of simple data communication through visible light, with the advantages of low cost, low power consumption and small in size.