毕业论文（论文)单片机温度数据采集系统方案.doc

摘要 PAGE IV word格式.整理版 单片机温度采集系统 摘 要 本文设计是以AT89C51单片机系统为基础的，通过热电阻变送器对热电阻随温度的变化而得到的模拟信号进行采集，连接多路模拟开关实现多路模拟信号的采集，并通过A/D转换器对模拟信号进行数模转换，把转换得到的数字信号按照顺序分别送入单片机或把指定的那路信号送入单片机，通过单片机进行控制操作。本文通过单片机报警系统来实现热电阻传感器测量的温度范围200-700摄氏度，若超出这个温度范围则报警。以单片机为核心完成温度检测、数据处理.显示及上下限报警功能。 关键词：数据采集系统，单片机，A/D转换器，热电阻变送器 The Temperature Acquisition System ABSTRACT It is based on AT89C51 one-chip computer system for this text to design, is it gather to go on through thermal resistance changer to analog signal that thermal resistance receive with change of temperature, join many way analog switch realize many way collection of analog signal , is it count through A/D converter to analog signal mould change to go on, Send digital signal received to change according to order into one-chip computer or designated those distance signal send into the one-chip computer separately, carry on control operation through one-chip computer. This text realizes 200~700 degrees Centigrade of temperature ranges that the thermal resistance sensor measure at the same time through the warning system of the one-chip computer, if beyond the scope of this temperature to report to the police. Regard one-chip computer as the core and finish temperature and patrol examining , data processing. Show and the warning function of upper and lower limits. KEY WORDS: DCS，One-Chip Computer，A/D converter，Thermal Resistance Changer 前言 目　录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc295325128 前　言 PAGEREF _Toc295325128 \h 1 HYPERLINK \l _Toc295325129 第1章 绪论 PAGEREF _Toc295325129 \h 2 HYPERLINK \l _Toc295325130 1.1课题背景 PAGEREF _Toc295325130 \h 2 HYPERLINK \l _Toc295325131 1.2温度采集的意义和技术发展 PAGEREF _Toc295325131 \h 2 HYPERLINK \l _Toc295325132 1.3单片机在本课题中的应用 PAGEREF _Toc295325132 \h 3 HYPERLINK \l _Toc295325133 第2章 主控模块的设计 PAGEREF _Toc295325133 \h 5 HYPERLINK \l _Toc295325134 2.1 8051单片机的引脚功能 PAGEREF _Toc295325134 \h 5 HYPERLINK \l _Toc295325135 2.2 8051单片机的扩展及系统电路 PAGEREF _Toc295325135 \