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基于AT89C52单片机超声波测距仪的设计 BASED ON AT89C51 ULTRASONIC RANGEFINDER DESIGN
学生姓名 学院名称 专业名称 指导教师
目录
摘要···········································1
1绪论············································3
1.1课题研究的背景··································3
1.2课题提出及研究的意义····························4
1.2.1课题的提出···································4
1.2.2课题的研究意义·······························4
2超声波的介绍和超声波的测距原理··················4
2.1超声波的介绍····································4
2.1.1什么是超声波········································4
2.1.1超声波的特性及特点··································4
2.1.3超声波的应用········································5
2.2超声波测距的原理及误差分析······················5
2.2.1超声波的测距原理····································5
2.2.2超声波的误差分析····································6
2.3单片机实现测距原理····································7
3系统硬件设计····································7
3.1系统结构设计····································7
3.2单片机AT89C52最小系统··························8
3.2.1单片机的功能········································8
3.2.2主要性能参数········································9
3.2.3 AT89C52的管脚说明··································9
3.3 DS18B20温度传感器简介··························11
3.4 T40 R40超声波传感器简介························11
3.4.1超声波传感器的基本介绍······························11
3.4.2 超声波传感器的基本原理······························12
3.5 LM7805稳压集成电路·····························12
3.5.1 LM7805介绍·········································12
3.5.2 LM7805特点··········································12
3.5.3 LM7805实际应用······································12
3.6 LM567 锁相环····································13
3.6.1 LM567概述···········································13
3.6.2 LM567 功能叙述······································13
3.6.3 LM567 主要参数······································13
3.7 超声波发射器电路································14
3.8超声波检测接受电路······························15
3.9 显示电路········································15
3.10 LM7805电平转换电路········
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