温度控制系统的设计与实现

文档编号:DZXX412  文档字数:15421,页数:45  附任务书，开题报告，中期报告，外文翻译

摘    要
 随着计算机系统的应用和微机网络的发展，各种控制设备之间的通信功能越来越显得重要，采用上位微机与下位单片机构成的主从式监控系统也越来越多，本课题以AT89S52单片机为核心器件，利用温度传感器DS18B20。采集的温度用1602液晶显示。同时在PC机与单片机构成的上、下位机系统中，把单片机采集的数据用基本三线制的RS232串行口通信将数据传送给PC机，使用VB上位机显示温度波形图。本温度监控系统利用DS18B20温度传感器技术，在RS232串口通信总线标准下，将VB和上、下位机系统结合起来，构成了一个高效的单总线温度监控系统。方案首先对测温技术、温度控制技术的现状进行了介绍，对各种控制理论、方案进行了简单的分析与比较；其次从实际应用的角度出发，开始对温度监控硬件部分的设计和选型、软件的设计与分析，且在实现中遵循简单、经济、实用的原则；然后详细介绍了本系统所用各芯片的特点、工作原理、应用及其与单片机间的通信协议。
 
 关键词：AT89S52；单总线；串口通信；Visual Basic6.0；MSComm
 
 
ABSTRACT
 According to the development of the application of computer systems and computer networks, kinds of equipment’s communication function is increasingly important, use the master-slave control system what the up-bit pc and down-bit MCU are constituted being more and more. The thesis takes the AT89S52 SCM as the core devices, and make use of the temperature sensor DS18B20.The 1602 LCD shows the collected temperatures. At the same time, at the up and down bit system of the component pc and SCM ,use the RS232 of the base three-wire serial port transmitting the datum that are collected by the SCM to the pc, and use the VB up-bit machine showing the picture of the temperature wave. The system of the temperature inspection imposes the technology of DS18B20 temperature sensor, at the standard of the RS232 Serial communication, connect the VB and up-down bit system, formed a single bus temperature system that is a sensible. At the first of all ,this case introduces the actuality of the  technology in measure and  control temperature, and ,it makes a simple analyzing and comparing; secondly, from the actually application, it turns to the design and style of the hardware part of the temperature sensor, design and analyze of the software, and follow the simple ,economic applied  principle when it is carried out; and then introduces the details of the system that all kinds of using CMOS chip’s characteristics ,the elements of theory, applications and with the communication between the SCM agreement.
 
KeyWords：AT89S52；Single bus；Serial communication；Visual Basic 6.0；MSComm
 
目  录
1引言 1
 1.1 研究的目的和意义 1
 1.2 温度控制技术的国内外现状和发展趋势 1
 1.3 设计思想与关键技术 2
2 方案论证 3
 2.1 主控芯片的选择 3
 2.2 温度传感器的选择 4
 2.3液晶显示器的选择 8
3 系统总体方案与硬件设计 12
 3.1 系统的功能要求与性能指标 12
 3.2 控制系统的总体设计 12
4 系统软件设计与实现 16
 4.1 初始化程序 16
 4.2 PC机数据通信程序的设计 17
 4.3 AT89S52通信程序的设计 20
5 结论 22
参考文献 23
附录1 程序 24
附录2 系统电路图 42
附录3 PCB板 43
致 谢 44

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