This document contains five papers on ultrasonic ranging and valuable people need to refer to the terms of the document.

预防近视\51单片机超声波测距设计--毕业论文.doc
........\基于单片机的近视预防报警系统设计.pdf
........\基于单片机超声波测距器设计(堪称经典制作)!.docx
........\基于预处理的Ballon模型及在眼疲劳检测中的应用.pdf
........\超声波发射接收电路.doc
预防近视

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