基于热敏电阻的数字温度计的设计-基于热敏电阻的数字温度计

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题目：基于热敏电阻的数字温度计设计

信息系电气工程及其自动化专业姓名

设计时间：2014年03月25日~2014年06月15日

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指导教师：（签字）

职务：

201年月日

太原理工大学阳泉学院

毕业设计答辩记录卡

信息系电气工程及其自动化专业姓名

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注：评定成绩为100分制，指导教师为30%，答辩组为70%。

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201年月日

摘要

温度计量是计量学的一个重要分支，它在国民经济各领域中占有重要的地位。人们的日常生活、工农业生产和科学实验等许多方面都与温度测量有着十分密切的关系。1871年，西门子(Sir william Siemens)发现了铂电阻测温原理，制造出第一支铂电阻温度计。1887年，卡伦德(Hugh Callendar)改进了铂电阻温度计的工艺和研制测温电桥并得到了著名的卡伦德公式。之后，铂电阻温度计成为国际温标的标准仪器，并一直沿用至今。

本文在查阅、分析了现有的几种不同的测温原理，分析确定了热敏电阻测温，并对基于热敏电阻pt100的数字温度计的设计进行了深入探讨和研究。该系统分为测温模块、信号放大模块、A/D转换模块和控制显示模块，并分别对其进行方案分析，最终确定数字温度计系统的系统构架和设计方案；在硬件电路中，详细阐述了各模块电路的工作原理，分析了以AT89C51单片机为主控单元的系统硬件和软件设计，并对该系统进行误差分析，使我们对于系统的各种性能有了进一步认识。

本文用protues进行仿真，采用at89c51单片机作为处理的核心部分；用pt100作为温度传感器，把采集到的温度经放大后送到adc0804进行A/D转换，经过at89c51单片机处理后送到显示器，显示器将显示采集的温度。

关键字：at89c51单片机，热敏电阻pt100，数码显示，protues

ABSTRACT

Temperature metrology, a major branch of metrology, plays an important role in every field of national economy . For example, people's daily life, industrial and agricultural production,scientific experiments and many other aspects are all connected closely to the temperature metrology. In 1871, Sir william Siemens discovered the principle of temperature measurement of platinum resistor and created the first platinum resistance thermometer in the world. , The platinum resistance thermometer technics was improved by Hugh Callendar in 1887 . At the same time he developed bridge for measuring temperature and made out the famous Callendar's formula. From then on Callendar's thermometer has been used as a standard instrument to international temperature scale.

Based on the inspection, analysis of the existing several different measurement principle, the analysis determined the thermistor temperature measurement, and a digital thermometer pt100 thermistor-based design in-depth study and research. The temperature measurement system is divided into modules, the signal amplification module, A / D converter module and a control module, and its solutions were analyzed to determine the final design of the system architecture and digital thermometer system; hardware circuit, elaborated Each module circuit works, and analyzes to AT89C51 main control unit of the system hardware and software design and error analysis of the system, so that our systems for a variety of performance has been further understanding.

In this paper, protues simulation, using at89c51 microcontroller as the core part of the process; using pt100 as a temperature sensor, the temperature of the collected adc0804 after amplification to the A / D conversion, after treatment at89c51 microcontroller to monitor, the display will show acquisition of temperature.

Keywords: at89c51 microcontroller, thermistor pt100, digital display, protues