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河南理工大学万方科技学院本科毕业论文摘要随着计量技术和电子技术的发展，传统纯机械结构的杆秤、台秤、磅秤等称量装置逐步被淘汰，电子称量装置电子秤、电子天平等以其准确、快速、方便、显示直观等诸多优点而受到人们的青睐。而且随着微电子技术的应用，市场上使用的传统称重工具已经满足不了人们的要求。为了改变传统称重工具在使用上存在的问题，本文设计了一种新型便携式电子秤，论述了仪器的工作原理，介绍了仪器的电路设计与软件流程，探讨了仪器的工程设计技术。本系统以AT89S52单片机为主控芯片，外围附以称重电路、显示电路、报警电路、键盘电路等构成智能称重系统电路板，从而实现自动称重系统的各种控制功能。提出了便携式电子秤的硬件设计方案，详细分析了各单元的硬件电路，给出了仪器电路设计与软件流程，及相关电路原理图、流程图，可以说,此设计所完成的电子秤很大程度上满足了应用需求。本系统主要由单片机来控制，I河南理工大学万方科技学院本科毕业论文测量物体重量部分由称重传感器及A/D转换器组成，加上显示单元，此电子秤俱备了功能多、体积小、操作简单、性能价格比高、功耗低、系统设计简单、速度快、测量准确、自动化程度高等特点。关键词：SP20C-G501，AT89S52，称重传感器，A/D转换器，LCD显示器AbstractWiththemeasuringtechniqueandthedevelopmentofelectronictechnology,thetraditionalpuremechanicalsteelyard,scales,scalesandotherweighingdevicebeingeliminatedgradually,electronicweighingdeviceofelectronicscales,electronicscales,withitsaccurate,fast,convenient,intuitivedisplayandmanyotheradvantageswhichfavoredbypeople.Butwiththeapplicationofmicro-electronicstechnology,onthemarketusingthetraditionalweighingtoolalreadycouldnotsatisfypeople'srequest.Inordertochangethetraditionalweighingtoolinuseontheexistingproblems,thispaperdesignsanewtypeportableelectronicscales,discussestheworkingprincipleoftheinstrument,introducesthecircuitdesignoftheinstrumentandthesoftwareflow,discussestheinstrumentengineeringdesigntechnology.II河南理工大学万方科技学院本科毕业论文ThesystemisbasedontheAT89S52microcontrollerasthemasterchip,accompaniedbyweighingtheexternalcircuit,displaycircuit,alarmcircuit,keyboardcircuit,constitutetheintelligentweighingsystemcircuitboard,therebyrealizingtheautomaticweighingsystemofthevariouscontrolfunctions.Thispaperputsforwardaportableelectronicscalethehardwaredesign,adetailedanalysisoftheunit'shardwarecircuit,givestheinstrumentcircuitdesignandsoftwareflow,andtherelatedcircuitdiagram,flowchart,cansay,thisdesigncompletestheelectronicscalealargeextenttomeettheapplicationrequirements.Thesystemconsistsofthesingle-chipmicrocomputertocontroltheweightofthemeasuringobject,inpartbytheweighingsensorandtheA/Dconvertercomponent,coupledwiththedisplayunit,theelectronicscalehasthemultiplefunctions,Smallvolume,simpleoperation,highpriceperformanceratio,lowpowerconsumption,thesystemdesignissimple,fast,accuratemeasurement,highdegreeofautomation.Keywords:SP20C-G501,AT89S52,weighingsensor,A/Dconverter,LCDdisplayIII河南理工大学万方科技学院本科毕业论文IV河南理工大学万方科技学院本科毕业论文目录前言................................................11.1电子秤的组成............................21.1.1电子秤的基本结构................21.1.2电子秤的工作原理................31.1.3电子秤的计量性能................31.2设计思路.....................................4第二章系统方案论证与选型..............62.1控制器部分................................72.2数据采集部分............................72.2.1传感器的选择.......................82.2.2放大电路选择.......................102.2.3...