基于PT100热电阻的简易温度测量仪摘要：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。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0℃～100℃范围内达到±0.1℃。本文采用STC89C52RC单片机，TLC2543A/D转换器，AD620放大器，铂电阻PT100及液晶系统，编写了相应的软件程序,使其实现温度及温度曲线的实时显示。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：PT100单片机温度测量AD620TL431AbstractThisarticlebrieflydescribesthecharacteristicsofPT100platinumresistanceandtemperaturemeasurementmethod,onthebasisitdescribesthedesignoftemperaturemeasurementsystembasedonPT100.Inthisdesign,itisuseaPT100platinumresistanceastemperaturesensor,inordertoacquisitionthetemperaturesignal,ituseofconstant-currenttemperaturemeasurementmethodandusesingle-chipcontrol,Amplifier,A/Dconverter.Itcanstillimprovetheperformusedtwo-wiretemperaturecircuitandreducethemeasurementeror.Thetemperatureprecisionisreached±0.1℃between0℃～100℃.ThesystemcontainsSCM(STC89C52),analogtodigitalconvertdepartment(TLC2543),AD620amplifier,PT100platinum,LCD12864,writethecorrespondingsoftwareprogramtoachievereal-timetemperaturedisplay.Thesystemissimple,accurate,stableandwiderange.Keywords:PT100MCUTemperatureMeasuresAD620TL431目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc370244733"前言PAGEREF_Toc370244733\h4HYPERLINK\l"_Toc370244734"第一章方案设计与论证PAGEREF_Toc370244734\h6HYPERLINK\l"_Toc370244735"1.1传感器的选择PAGEREF_Toc370244735\h6HYPERLINK\l"_Toc370244737"1.2方案论证PAGEREF_Toc370244737\h7HYPERLINK\l"_Toc370244738"1.3系统的工作原理PAGEREF_Toc370244738\h8HYPERLINK\l"_Toc370244739"1.4系统框图PAGEREF_Toc370244739\h9HYPERLINK\l"_Toc370244740"第二章硬件设计PAGEREF_Toc370244740\h9HYPERLINK\l"_Toc370244741"2.1PT100传感器特性和测温原理PAGEREF_Toc370244741\h9HYPERLINK\l"_Toc370244742"2.2硬件框图以及简要原理概述PAGEREF_Toc370244742\h11HYPERLINK\l"_Toc370244743"2.3恒流源模块测温模块设计方案PAGEREF_Toc370244743\h11HYPERLINK\l"_Toc370244744"2.4信号放大模块PAGEREF_Toc370244744\h12HYPERLINK\l"_Toc370244745"2.5A/D转换模块PAGEREF_Toc370244745\h15HY