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1、I摘 要随着社会的进步和工业技术的发展，人们越来越重视温度因素，许多产品对温度范围要求严格，而目前市场上普遍存在的温度检测仪器大都是单点测量，同时还有温度信息传递不及时、精度不够的缺点，不利于工业控制者根据温度变化及时做出决定。在这样的形式下，开发一种能够同时测量多点，并且实时性高、精度高，能够综合处理多点温度信息的测量系统就很有必要。本课题针对温度控制的特点及实现准确温度控制的意义，设计了一种基于单片机的控制系统。设计内容包括硬件和软件两个部分。硬件电路以 AT89S51单片机为微处理器，详细设计了温度信号采样电路，键盘及显示电路，温度控制电路，报警电路，时钟信号电路。本设计由键盘电路输入设
2、定温度信号给单片机，温度信号采集电路采集现场温度信号给单片机，输出控制信号给温度控制电路，实现降温。显示电路实现现场温度的实时监控。本课题对多点的温度进行实时巡检。各检测单元（从机）能独立完成各自功能，同时能够根据主控机的指令对温度进行定时采集，测量结果不仅能在本地显示，而且可以利用单片机串行口，进行进一步的存档、处理。主控机负责控制指令的发送，控制各个从机进行温度采集，收集测量数据，并对测量结果（包括历史数据）进行整理、显示和存储。主控机与各从机之间能够相互联系、相互协调，从而达到系统整体统一、和谐的效果。关键词：关键词：单片机单片机; ;温度测量温度测量; ; 铂电阻铂电阻IIAbstra
3、ctAs the industry and the society developing, the temperature becomes more and more important and a lot of products are sensitive to temperature. However, temperature-measuring apparatus in the market now only can check and measure the temperature of one point, at the same time, the temperature info
4、rmation is not real time and the precision is low. It takes a great of troubles for the industry-controllers to make decision .In this situation, design and implement one applicable system which can watch measure and control the temperature and the measuring results is real time and the precision is
5、 great is more essential. In order to meeting this application, this paper talk about The Multiple-Points temperature Measuring System.The temperature control issues against the characteristics and achieve precise control of temperature, Design elements include hardware and software in two parts. Ha
6、rdware circuit to AT89S51 MCU for microprocessors, for the detailed design of the microcontroller to provide electricity supply circuit, Temperature signal sampling circuit, keyboard and display circuits, such as heating control circuit four circuit module. The circuit design of the keyboard input f
7、rom the set temperature signal to the microcontroller, Temperature Signal Acquisition Circuit collect temperature signal to the microcontroller, According to SCM input and feedback signal, Heating and achieve stop. Show circuit scene of the real-time monitoring of temperature. This system can inspec
8、t and control multiple temperatures in real time. The Slaved Machine can collect temperature information on its own and display it on the LED module. Following the Master Machines command, the Slaved Machine can up-send the temperature information to the Master Machine and the communication protocol
9、. The Master Machine sends commands, controls the Slaved Computer gathering and up-sending the temperature data including history information, and it manages processes and stores the temperature information. The Master and Slaved Computer will exchange information and correspond to each other, so it
10、 works together perfectly.Key words: single chip computer ;measure-temperature ;Platinum resistoIII目 录 摘 要.IAbstract.II第 1 章 引言 .11.1 课题背景 .11.2 系统实现目标 .2第 2 章 硬件的选择及方案的论证 .32.1 方案比较 .32.1.1 设计方案一 .32.1.2 设计方案二 .32.1.3 设计方案三 .42.2 温度信号的获取与放大 .52.2.1 温度传感器选用细则 .52.2.2 温度信号获取与放大电路 .62.3 模数转换单元 .82.3.1 ADC0804 微控制器.82.3.2 ADC0804 引脚图.102.4.1 矩阵式键盘的连接方法和工作原理 .112.4.2 矩阵式键盘的按键识别方法 .122.5 串口 LED 数码管显示电路及程序.13第 3 章 硬件电路的设计 .153.2 单片机最小系统 .173.2.1 单片机概述 .
