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1、摘要液位测量一直与自动化密切相关,几乎遍及生产与生活的各个领域。近年来由于新检测原理及微电子技术的发展和应用,使得液位测量仪更趋向小型化和智能化,逐步实现了故障诊断和报警,高精确度、高可靠性、安全性和多功能化。本文研制的液位和液体流速实时检测系统可以自动检测液位,精确测量液体流速。当液位达到设定限值、液体流速过高或过低时,都能发出声光报警,提醒有关人员及时处理。本系统以80C51为核心,辅以必要的外围电路,检测液体的液位、液体流速,从而可以显示、报警。在硬件方面,以MCS-5l单片机为控制核心,还包括液位与流速采集模块,A/D转换电路模块,LCD显示模块,报警模块等。软件方面采用汇编语言
2、编程,整个控制系统能根据容器内液位的高低来决定阀门的开度,并且在发生故障时由外部电路的LED发光管点亮报警。关键词:液位检测、液体流量检测、A/D转换、单片机31AbstractLiquidlevelmeasuringiscloselyrelatedwithautomation,virtuallyallfieldsofproducingandliving.Inrecentyearsduetonewtestingtheoryandmicroelectronictechnology'sdevelopmentandapplication,theliquidlevelmeasuringinstr
3、umentsmoreinclinetominiaturizationandintellectualization,andgraduallyrealizefaultdiagnosisandalarm,highprecision,highreliability,safetyandmulti-function.Thispaperdevelopedaliquidlevelandspeedreal-timedetectionsystemcanautomaticallydetecttheliquidlevel,theaccuratemeasurementofliquidvelocity.Whenth
4、eliquidlevelreachesasetvalue,theliquidflowistoohighortoolow,cansendoutaudibleandvisualalarm,toremindtherelevantpersonneltotimelytreat.Keywords:liquidleveldetection,liquidspeeddetection,singlechipcontrol.Thissystem,whosekernelis80C51,supplementedbynecessaryperipheralcircuit,detectingthelevelofaliq
5、uid,liquidflow,whichcandisplay,alarm.Inthehardwareaspect,withMCS-5lasthecontrolcore,alsoincludesliquidlevelandflowvelocitycollectionmodule,A/Dconversioncircuitmodule,LCDmodule,alarmmodule.Softwareusingassemblylanguageprogramming,thewholecontrolsystemaccordingtotheliquidlevelheightdecidedthedegree
6、ofvalveopening,andintheeventofafailurebytheexternalcircuitLEDlightalarm.Keywords:liquidleveldetection,liquidspeeddetection,A/Dconversion,singlechipcontrol31目录摘要IABSTRACTII目录III第一章引言11.1概述11.1.1课题研究背景21.1.2课题研究意义31.2智能仪器的研究状况3第二章系统设计方案论证与器件简介92.1液位与流速检测系统设计方案论证92.2硬件设计框图132.3器件的介绍142.3.1单片机142.3.2
7、投入式液位计传感器152.3.3LUGB型应力式涡街流量传感器172.3.4ADC0809的简介232.4本章小结24第三章硬件电路设计253.1单片机控制模块253.2液位与流速采集模块263.2.1液位的采集模块263.2.2流速的采集模块263.3LED显示电路273.4键盘模块303.5电源电路323.5.1LM78系列三端固定稳压器的原理323.5.2电源电路的设计333.6A/D转换模块343.7报警电路模块353.8本