《基于NTC热敏电阻的温度测量与控制系统设计》-毕业论文(设计).doc
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题目名称:基于NTC热敏电阻的温度测量与控制系统设计
摘要: 本系统由TL431精密基准电压,NTC热敏电阻(MF-55)的温度采集,A/D和D/A转换,单片机STC89C51为核心的最小控制系统,LCD1602的显示电路等构成。温度值的线性转换通过软件的插值方法实现。该系统能够测量范围为0~100℃,测量精度±1℃,并且能够记录24小时内每间隔30分钟温度值,并能够回调选定时刻的温度值,能计算并实时显示24小时内的平均温度、温度最大值、最小值、最大温差,且有越限报警功能。由于采用两个水泥电阻作为控温元件,更有效的增加了温度控制功能。
关键词: NTC TL431 温度 线性转换
Abstract: The system is composed of TL431 as precise voltage,the temperature acauisition circuit with NTC thermistors (MF-55), the transform circuit of A/D and D/A, the core of the minimum control system with STC89C51, 1the display circuit usingLCD1602, etc. Get the temperature of the linear transformation by the software method. The range of the measure system is 0 ~ 100 ℃, measurement accuracy + 1 ℃.It can record 24 hours of each interval temperature by per 30 minutes selected of temperature.The time can be calculated and real-time display within 24 hours of the average temperature, maximum temperature and minimum temperature, maximum value, and each temperature sensor has more all the way limit alarm function. Due to the two cement resistance as temperature control components, the more effective increase the temperature control function.
Keyword: NTC TL431 temperature linear conversion
目 录
TOC \o 1-3 \h \z \u HYPERLINK \l _Toc296246439 1方案设计与论证 PAGEREF _Toc296246439 \h 3
HYPERLINK \l _Toc296246440 1.1 整体设计方案比较和选择 PAGEREF _Toc296246440 \h 3
HYPERLINK \l _Toc296246441 2 系统设计 PAGEREF _Toc296246441 \h 5
HYPERLINK \l _Toc296246442 2.1 总体设计 PAGEREF _Toc296246442 \h 5
HYPERLINK \l _Toc296246443 2.2 各单元模块功能介绍及电路设计 PAGEREF _Toc296246443 \h 5
HYPERLINK \l _Toc296246444 2.2.1 学习板电路 PAGEREF _Toc296246444 \h 5
HYPERLINK \l _Toc296246445 2.2.2 测温通道电路 PAGEREF _Toc296246445 \h 7
HYPERLINK \l _Toc296246446 2.2.3 模数转换电路 PAGEREF _Toc296246446 \h 8
HYPERLINK \l _Toc296246447 2.3 特殊器件的介绍 PAGEREF _Toc296246447 \h 8
HYPERLINK \l _Toc296246448 3 软件设计 PAGEREF _Toc296246448 \h 9
HYPERLINK \l _Toc296246449 3.1 软件流程图 PAGEREF _Toc2962464
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