文档介绍：-
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**职业技术师范大学
Tianjin University of Technology and Education
毕业论文
专业：
班级**：
function. Mainly by the ranging system (including ultrasonic transmitting module, ultrasonic receiver module) and voice alarm system, time to broadcast system, warning lights, control system, regulated power supply, the five major modules.
The design USES AT89S52 single chip microputer system I/O mouth, control issue of 40 KHZ ultrasonic ultrasonic sensor, using the reflected ultrasonic wave signal, after amplification, plastic, such as filter circuit back to the single-chip microputer, is after the debugging and the distance between the obstacles, to plete the range.
The device will single-chip microputer real-time control and data processing capabilities, bined with ultrasonic ranging technology, sensor technology. Issued a warning sound, voice system remind users in front of the obstacles to avoid. Under the condition of the invisible for the blind and can identify the obstacles in front of the normal walking, which play a role to protect the safety of the blind.
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Key Words：Intelligent obstacle avoidance ；Ultrasonic ranging；Single chip microputer
目录
1．引言1

2．超声波系统的工作原理及方案3
超声的概述3

超声测距的方案4

3．智能导盲拐杖硬件系统设计6

CPU模块7
超声波换能模块10
语音播报模块设计15
温度检测模块和时钟模块的设计16
灯光示警模块设计18
稳压电源模块的设计19

4．智能导盲拐杖软件设计21

软件设计心得21

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5系统的调试结果24
结论25
参考文献27
致 27
附录1：局部主电路原理图29
附录2：局部主程序30
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1．引言
我国曾在上世纪90年代进展过视力残疾状况的调查，结果显示，我国有视力残疾患者近1400万，其中盲人约就有620万。从全国防盲技术指导组办公室得到的数据也显示，我国有550万盲人，占世界盲人总数的1/5。随着人民生活水平的不断的进步，让生活变得越来越简单方便成为了人民普遍追求的生活理念。盲人既是我们普通人民中的一员，又是一个特殊群体，他们由于先天或后天的生理缺陷在日常生活中比我们常人会遇到更多的不方便，不能准确及时的发现并躲避障碍物就是一个重要的弊端。如果有一种既轻巧，又廉价，