AT89C51单片机汽车倒车控制系统设计+电路图
本系统的设计主要运用到超声波测距和AT89C51单片机两个模块。超声波测距在实际中应用比较广泛，利用超声波测距具有设计简单、操作方便、测量精确等特点。超声波是超声波测距的重点，是生活中最常用到的声波，它抗干扰能力强，传播强度高，很适合于测距工作。AT89C51单片机是该系统的控制核心，它兼容性高，程序运行与计算都是由它完成的，连接着各个模块。本系统以AT89C51单片机为核心，利用超声波测距装置完成超声波的收发工作，单片机运行超声波测距子程序计算出距离，在运行中断程序避免盲区的情况下选出有效距离，并在LED显示器上显示出来，完成超声波的测距工作。37552
毕业论文关键词：超声波；AT89C51；LED显示；测距
Reverse Control System Design
Abstract: With the continuous development of our country's economy, the number of vehicles is increasing, causing traffic accidents are increasing, which caused the traffic accident due to reverse. Reverse design of the control system is the solution to the problem of reversing difficult, this system applied in the car can help the driver with a clear understanding of the rear of the distance to the obstacles, thus effectively avoid the occurrence of traffic accidents.
The system design is mainly applied to ultrasonic ranging and AT89C51 two modules. Ultrasonic distance measurement is widely used in practice, the use of ultrasonic distance measurement is simple in design, easy to operate, the precision of measurement. Ultrasonic is the key of the ultrasonic ranging, is the most commonly used in life to the sound waves, it strong anti-jamming capability, transmission intensity is high, very suitable for the working range. Is AT89C51 single chip microcomputer as control core of the system, it high compatibility, the program runs and calculation is done by it, connected every module. This system USES AT89C51 microcontroller as the core, the use of ultrasonic distance measurement device of ultrasonic transceiver work, according to the time difference computing distance, and displayed on the LED display, the ultrasonic ranging system.
Keywords:Ultrasonic; AT89S51; LED display; Range
目 录
摘 要 1
引言 2
1.绪论 2
1.1 系统设计的背景和意义 2
1.2 国内外发展现状和发展前景 3
2.总体设计方案 3
2.1 本设计的研究方法 3
2.2 系统整体方案的设计 4
2.3 超声测距原理 4
2.3.1 超声波概述 4
2.3.2 超声波传感器概述 5
2.3.3 超声波测距的原理 6
2.4 AT89C51单片机 7
2.4.1 AT89C51单片机概述 7
2.4.2 AT89C51单片机的应用 8
3.系统硬件设计 9
3.1 硬件系统工作原理 9
3.2 硬件系统及其组成 10
3.2.1 超声波测距单片机系统 10
3.2.2 超声波发射、接受电路 11
3.3.3 显示电路 12
3.3.4 供电电路 13
3.3.5 报警电路 13
4.系统软件设计 14
4.1 超声波测距子程序流程图 14
4.2 系统主程序设计及流程图 16
5.总结 18
5.1 整体方案实现 18