基于at89c52单片机超声波测距仪的设计.pdfVIP

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基于AT89C52单片机超声波测距仪的设计

BASEDONAT89C51ULTRASONIC

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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

3.2.3AT89C52的管脚说明··································9

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3.3DS18B20温度传感器简介··························11

3.4T40R40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

3.5LM7805稳压集成电路·····························12

3.5.1LM78