摘要：随着我国经济建设的不断飞速发展，交通运输业已日愈繁荣，铁路运输事业更是发展十分迅速，安全问题也是制约铁路发展的重要因素之一，更是在对于列车运行速度要求日益提高的今天，安全问题更是显得十分重要。平交道口是铁路运输安全问题的重点和薄弱点，也是铁路的事故多发地段。每年在平交道口发生的交通事故伤亡人数众多。因此如何提高铁路平交道口的安全性也就成为了一个重要性的课题。32010
针对我国铁路道口的情况，利用单片机技术研发水平的车辆自动报警系统，可靠性高，价格低，受欢迎，有利于基层技术人员学习掌握STC89C52单片机作为控制芯片，利用轨道传感器收集回来的信息准确的车。未来汽车的信息通过出口关税人员和过往车辆和行人知道，大大减少了事故隐患，为提供安全的火车和高速运行的一个非常可靠的保证。
本文可以较好的实现预期的功能，尤其是对来车的感知与控制，还有对道口机动车辆和行人的报警通知，系统的稳定性体现是在雨，雾，风，沙等能见度较低的天气状况下，更是作用重大，为人民的人身和财产安全起到重大作用。因此，本文的研究与设计具有重要的社会意义以及推广价值。
毕业论文关键词： 运输安全；铁路道口；89C52
Automatic alarm system for railway crossing
Abstract：With the development of China's economic construction, traffic transportation industry has more and more prosperity, railway transportation is the rapid development, the security problem is restricting the development of the railway is one of the important factors, especially in on the train speed requirements increasing today, security is particularly important. The road crossing is the key issue of railway transportation safety and the weak point, but also the railway accident prone area. Every year in traffic accident casualties occurred in many crossings. So how to improve the safety of railway crossing has become a very important problem.
    The in view of the present situation of our country railroad crossings, by using the single chip microcomputer the level crossing vehicle automatic alarm system, the high reliability, low price, popular, to basic technical personnel to master learning 89C51 as the control chip, the acquisition of sensor track back the wheel of information, accurate future car information through know duty 
personnel and passers-by, greatly reducing the accident hidden danger, provides a reliable guarantee for the safe and high-speed running of the train.
In this paper can better realize the expected function, especially of perception and control of the car and on motor vehicles and pedestrians crossing alarm notification, the system stability is reflected in rain, fog, wind, sand and other low visibility weather conditions, it is important that people's personal and property safety plays an important role. Therefore, the research and design of this paper has important social significance and promotion value..
Keywords: transportation safety; railway crossing; 89C52
目 录
1  绪论. 1
1.1  课题的背景与研究意义.. 1
1.2  国内外相关研究现状. 2
1.3  本文的主要工作与安排.. 3
2  硬件电路设计.. 5
2.1  系统组成部分. 5
2.2  单片机最小电路系统. 5
2.2.1  单片机STC89C52简介 5
2.2.2  时钟电路设计 9
2.2.3  复位电路设计 9
2.3  信号采集电路 10
2.3.1  称重传感器的基本原理 10
2.3.2  称重传感器的计算原理 11
2.3.3  称重传感器模块电路原理图.. 11
2.4  显示与报警模块. 12
2.5  按键控制电路 13
2.6  电源模块. 14
2.7  栏杆起落电机控制电路. 14 STC89C52单片机铁路道口自动报警系统设计:http://www.751com.cn/zidonghua/lunwen_28397.html