文档介绍：毕业设计说明书
基于单片机的八路数字温度巡检仪设计
专业电气工程及其自动化
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完成日期 2012年6月8日
基于单片机的八路数字温度巡检仪设计
摘要:八路数字温度巡检仪能够实现在安全生产、产品质量、生产效率、能源节约等方面的重大技术经济指标,在工农业生产中具有良好的应用前景。
本课题介绍了基于单片机的八路数字温度巡检系统的设计方案和软硬件实现。设计中采用了八个Pt100铂电阻电桥进行温度采集,八选一数据选择器HCF4051BE对八路模拟信号进行选择,再由16位高精度模数转换器TM7705对采集到的八路温度轮流进行模数转换,最后通过单片机控制和程序处理,得到准确的温度值,通过五位数码管显示通道、温度数据,从而完成温度巡检过程。当温度超过测量范围时,由发光二极管闪动进行超限提示。该系统主要由七个模块组成,分别为STC89C52单片机最小系统模块、LED数码管输出模块、按键输入模块、八路铂热电阻桥温度采集模块、电源模块、八选一通道选择模块和模数转换模块。正常运行时,其测温范围是-25℃~110℃,设计中给出了系统总体设计框图、系统设计原理图、PCB图及程序,并在硬件平台上实现了设计要求。
关键词:单片机,Pt100,TM7705,温度巡检
Design of Eight Channels' Digital Temperature Inspection Instrument Based on SCM
Abstract: Eight channels' digital temperature inspection instrument can realize in safe production, product quality, production efficiency, energy saving, and other aspects of the important technical economic indicators, in agricultural and industrial production has good application prospect.
This subject introduces eight channels' digital temperature circuit design scheme of the system and hardware and software implementation based on SCM. Applied to the design of the eight Pt100 platinum resistance temperature electric bridge collection, eight choose a multiplexer HCF4051BE 8 to choose analog signals, again by 16 high precision TM7705 adc for the collected 8 temperature in turn modulus conversion, finally through the single-chip puter control and procedures, get accurate temperature, through the five digital pipe display temperature data channels, so as plete the inspection process temperature. When the temperature more than measuring range, the light emitting diode flashing to overrun hints. The system consists of seven modules, respectively STC89C52 single chip minimize system module, LED digital pipe output module, key input module, 8 platinic resistance bridge acquisition module, the power supply module temperature, eight choose a channel selection module and modulus conversion operation, its temperature range is-