摘要：随着铁路事业的长足发展，大量空调列车参与运营，使车厢环境得以改善，但由于列车车厢人员密度、空调系统工作状态等因素的影响，使车内环境有时无法满足旅客舒适度要求，甚至给旅客与乘务员带来不适。因此，为改善列车车厢环境，提高铁路旅客乘坐舒适度，增加铁路客运经济效益，对列车车厢环境监测系统研究是有必要的。本设计应用STC89C51芯片作为核心，采用C语言进行编程，实现温度检测。该设计的系统由LCD显示电路、温度检测电路电路两部分组成。使用LCD1602为显示器，同时利用温度传感器DS18B20测量周围环境温度。设计还提供三位实时温度检测并显示，其显示精度为1℃。系统能够为环境部门制定相关标准提供技术支持，对改善乘车出行环境，提高铁路服务质量，促进铁路的大发展是有意义的。38738
毕业论文关键词：STC89C51芯片；温度传感器DS18B20；显示器LCD1602
Study on environmental monitoring system of carriage
Abstract：With the rapid development of railway business, a large number of air-conditioned trains are put into operation to improve the environment of the carriages. However, due to the density crew, operating state of air-conditioning and other factors, interior environment sometimes cannot meet the requirements, and even discomfort to passengers and staffs. Therefore, it's necessary to research environmental monitoring system of railway carriages, so as to improve the environment of the carriages, amenity of passengers, and increase economic benefits. This design applies STC89C52 chip as the core, using C language programming, realize the real-time temperature detection. The design of electronic clock system consists of a LCD display circuit and temperature detection circuit of two parts. Use the function of the LCD1602 to display, at the same time using temperature sensor DS18B20 measuring ambient temperature. The design also provides real-time temperature detection and display, the display accuracy of 1 ℃.The system achieves intended purpose and warning of environmental hazards by online monitoring, reminds workers to take effective measures to control, and provides technical support to develop standards for the environmental sectors. It's meaningful to improve the environment, service quality and promote the great development of the railway.
Key Words：STC89C52 calendar；； temperature sensor DS18B20；LCD1602
目 录
1绪论    1
1.1 课题研究背景与意义    1
1.2 国内外现状分析    2
1.2.1 国内研究现状    2
1.2.2 国外研究现状    2
1.3 课题研究的目的与发展趋势    2
1.3.1 课题的目的    2
1.3.2课题的发展趋势    2
2 硬件的方案选择    4
2.1显示模块选择    4
2.2温度传感器的选择    4
2.3芯片的选择    5
3 主要硬件介绍    6
3.1 微处理器    6
3.1.1单片机的主要特性    6
3.1.2 STC89C51的引脚具体介绍    6
3.2 LCD1602    8
3.2.1 工作原理    8
3.2.2端口引脚第二功能    8
3.2.3管脚功能    9
3.3 DS18B20 介绍    10
3.3.1温度测量模块    12
3.4 Keil C51编译器简介    12
3.4.1 开发工具    12
4 硬件设计与实现    14
4.1 单片机最小系统的设计    14
4.2 温度采集模块的设计    15
4.3 LCDM1602显示模块设计    16
5 系统软件设计与实现    16 STC89C51单片机车厢内环境综合监测系统设计+电路图+代码:http://www.751com.cn/tongxin/lunwen_37785.html