1、 基于基于 PT100 单片机的温度测量系统设计单片机的温度测量系统设计 摘摘 要要 本文首先简要介绍了铂电阻 PT100 的特性以及测温的方法,在此基础上阐述了基于 PT100 的温度测量系统设计。在本设计中,是以铂电阻 PT100 作为温度传感器,采用恒流测温的方 法,通过单片机进行控制,用放大器、A/D 转换器进行温度信号的采集。另外,还设计了时 钟电路模块,能实现对温度的实时测量。本设计采用了两线制铂电阻温度测量电路,通过对 电路的设计,减小了测量电路及 PT100 自身的误差,使温控精度在 0100范围内达到 0.1。 本文采用 AT89S51 单片机,TLC2543 A/D 转换器
2、,DS1302 时钟芯片,AD620 放大器,铂电 阻 PT100 及 6 位数码管组成系统,编写了相应的软件程序,使其实现温度的实时显示。该系统 的特点是:使用简便;测量精确、稳定、可靠;测量范围大;使用对象广。 关键词:关键词: PT100 单片机 温度测量 DS1302 Abstract This article briefly describes the characteristics of PT100 platinum resistance and temperature measurement method, on the basis it describes the design
3、 of temperature measurement system based on PT100. In this design, it is use a PT100 platinum resistance as temperature sensor, in order to acquisition the temperature signal, it use of constant-current temperature measurement method and use single-chip control, Amplifier, A / D converter. In additi
4、on, it designs a clock circuit modules to achieve real-time measurement of temperature.It can still improve the perform used two-wire temperature circuit and reduce the measurement eror. The temperature precision is reached 0.1 between 0100. The system contains SCM(AT89S51), analog to digital convert department (TLC2543), DS1302 chip, AD620 amplifier, PT100 platinum, LED Digital tube with six, write the corresponding software program to achieve real-time temperature display. The sys