XXXXXXXXXXXX毕业设计（论文）中文摘要基于51的超声波测距汽车防撞系统
【摘要】
基于51的超声波测距汽车防撞系统，介绍了超声波测距的基本原理和系统框图，给出了超声波发射和接收电路，通过盲区的消除，提高了测距的精确度。利用超声波传输中距离与时间的关系，采用51单片机进行控制及数据处理，设计出了能精确测量两点间距离的超声波液位检测系统。系统主要由超声波发射器电路、超声波接收器电路、单片机控制电路、按键电路及显示电路构成。利用所设计出的超声波测距汽车防撞系统，对行驶中的车距进行了测试，采集当时两车距离过近系统会发出声光警报提示司机作出相应反应动作。此系统具有易控制、工作可靠、测量精度高的优点，可实时车距检测。
【关键词】
超声波、MC U、LED、测距、传感器
XXXXXXXXXXX毕业设计（论文）英文摘要
51 car collision avoidance system based on 【Abstract】Ultrasonic ranging car anti-collision system based on 51, introduces
the principle and system frame of ultrasonic distance measurement, the ultrasonic transmitter and receiver circuit, the blind area elimination, to improve the measurementaccuracy. The relation between ultrasonic transmission distance and time, using 51 single-chip microcomputer control and data processing, design the ultrasonic liquid level detection system for accurate measurement of distance between two points. The system is mainly composed of the ultrasonic transmitter circuit,ultrasonic receiver circuit, single-chip microcomputer control circuit, keyboard circuit and display circuit. The use of ultrasonic ranging automotive anti-collision system are designed, the running distance between vehicles were tested,two carcollection was too close to the system will send out sound and light alarm to warn the driver response action. This system has the advantages of easy control,reliable operation, high measuring precision, real-time vehicle distance detecting.
【Key Words】Ultrasonic, MCU, LED, location, sensor
目录
1 绪论 (5)
1.1研究的背景 (5)
1.2研究的主要内容 (6)
1.3应解决的关键问题 (6)
2 电路方案论证 (7)
2.1方案比较 (7)
2.1.1 激光测距 (7)
2.1.2 超声波测距 (7)
2.2电路总体方案 (7)
3单片机概述 (9)
3.1 STC89C51主要性能 (9)
3.2 STC89C51外部结构及特性 (9)
3.3 STC89C51内部组成 (11)
4 超声波测距模块 (12)
4.1 超声波传感器介绍 (12)
4.2 HC-SR04超声波测距模块的性能特点 (13)
4.3 HC-SR04的管脚排列和电气参数 (14)
4.3.1 管脚简介 (14)
4.3.2 HC-SR04的电气参数 (14)
4.4超声波时序图 (15)
5系统硬件电路设计 (16)
5.1单片机最小系统 (16)
5.1.1 STC89C51芯片 (16)
5.1.2 复位电路 (16)
5.1.3 晶振电路 (17)
51二手汽车网5.2 驱动显示电路及报警电路 (18)
5.2.1 LED数码管显示电路 (18)
5.2.2 蜂鸣器和LED报警 (18)
5.3 HC-RS04超声波测距原理 (19)
5.4 按键设置电路 (20)
6系统程序的设计 (22)
6.1主程序 (22)
6.2显示数据子程序 (22)
6.3报警子程序 (23)
6.4按键子程序 (23)
结论 (25)
参考文献 (26)
附录（A） (27)
附录（B） (28)
致谢................................................................................. 错误!未定义书签。
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