目 录
第一章 绪论 ........................................................................................................................1
1.1 研究的背景和意义 ...................................................................................................1
1.2 国内外研究现状 .......................................................................................................1
1.3 课题研究内容和意义 ...............................................................................................2
第二章 超声波测距的原理................................................................................................5
2.1 超声波介绍 ...............................................................................................................5
2.2 超声波传感器的介绍 ............................................................................................5
2.2.1 传感器的选择 ....................................................................................................6
2.2.2 超声波测距的原理 ............................................................................................7
2.2.3 温度补偿 ............................................................................................................8
2.2.4 测量盲区 ............................................................................................................9
2.3 本章小结 ...................................................................................................................9
第三章 系统硬件设计......................................................................................................10
3.1 系统硬件设计 .........................................................................................................10
3.2 单片机概述 .............................................................................................................11
3.2.1 STC89C51 主要性能特点 .............................................................................11
3.2.2 STC89C51 结构组成 .....................................................................................12
3.2.3 STC89C51 内部组成 .....................................................................................14
3.3 超声波发射电路设计 .............................................................................................15
3.3.1 发射电路设计方案 ..........................................................................................15
3.3.2 超声波发射器的注意事项 ..............................................................................16
3.4 超声波接收电路设计 .............................................................................................17
3.5 LCD 显示部分 ......................................................................................................18
3.6 报警部分 .................................................................................................................20
3.7 DS18B20 部分 ......................................................................................................21
3.8 本章小结 .................................................................................................................21
第四章 系统软件设计......................................................................................................22
4.1 系统软件设计 .........................................................................................................22
