单片机电子秤设计报告(DOC)

reinforcedrateover1%ofreinforcedconcrete7~97.3.3steelengineering(1)steelprocessingsteelofsurfaceshouldcleannoinjury,paintpollutionandrust,shouldinusingQianeliminationclean,withparticles-likeoroldrustofsteelshallnotusing.Steelmachiningdimensionshallconformtotheconstructiondrawings,processedsteel'ssizeshouldbewithinthetolerancevalue.Steelprocessing(2)steelsteelinstallationprograminstalled(3)weldingofreinforcingsteel,lashingstrapswelded:reinforcementinstrictaccordancewiththerelevantguidelines,horizontalevenverticalbanding,solid.Steelbarconnectionbysolderingorlap,two-sidedweldseamlength5d;single-sidedweldseamlength10d.Laplengthandnotlessthan35d.7.3.4formwork(1)selectionoftemplatesfromtheprojectduetotheface,largeamountofformwork.Accordingtothestructuralarrangementandconstructionplan,usingthefollowingtemplatetypes:1)combinedsteelformworkisusedforfloor,wallandotherparts,trucksdeliveredtotheconstructionsite,assemblingmanual.2)arcarcsegmentofsluiceanddamtemplatethetemplatestillusingsteelformwork,producedaccordingtoPierArcsizespecifications.(2)template-1)combinedsteelformworkusingconventionalconstructionmethods,partmeasuringwireclaspwiththepressatthesitestructuretemplates,andverticalshaft,andtemporaryreinforcement,transversebandontheformwork,onthescrew,andfinalweldingrod,bybus,correctingtemplates,andtemplateandsupportreinforcement.2)templateandscaffoldthequalityofexistingnationalstandardsortradestandards,woodqualitystandardsIIandabovematerialshouldbe.Brittlewooddecay,seriousdistortionsorprohibited.MoldflatnessofthePanelshouldmeetthestandardrequirements,shouldbeassmoothaspossible,pitsarenotallowed,wrinklesorothersurfacedefects.Templatesproduceshouldmeettherequirementsofconstructiondrawingsofthebuildingsstructuralprofile,itsproductiontolerancesuptoSDJ207-822.4.provisionsofarticle1.Slip,amobiletemplate,allowabledeviationofapermanentspecialtemplates,templatedesigndocumentsapprovedbythesupervisoroftheregulations.Templatesaccordingtodrawings单片机电子秤设计报告秤是一种在实际工作和生活中经常用到的测量器具。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。和传统秤相比较，电子秤利用新型传感器、高精度AD转换器件、单片机设计实现，具有精度高、功能强等特点。本课题设计的电子秤具有基本称重、键盘输入、计算价格、显示、超重报警功能。该电子秤的测量范围为0-40Kg，测量精度达到5g，有高精度，低成本，易携带的特点。电子秤采用液晶显示汉字和测量记过，比传统秤具有更高的准确性和直观性。另外，该电子秤电路简单，使用寿命长，应用范围广，可以应用于商场、超市、家庭等场所，成为人们日常生活中不可少的必需品。一、功能描述1、采用高精度电阻应变式压力传感器，测量量程0-40kg，测量精度可达5g。2、采用电子秤专用模拟/数字（A/D）转换器芯片hx711对传感器信号进行调理转换，HX711采用了海芯科技集成电路专利技术，是一款专为高精度电子秤而设计的24位A/D转换器芯片。3、采用STC89C52单片机作为主控芯片，实现称重、计算价格等主控功能。4、采用128*64汉字液晶屏显示称重重量、单价、总价等信息。5、采用4*4矩阵键盘进行人机交互，键盘容量大，操作便捷。6、具有超量程报警功能，可以通过蜂鸣器和LED灯报警。7、系统通过USB电源供电，单片机程序也可通过USB线串行下载。reinforcedrateover1%ofreinforcedconcrete7~97.3.3steelengineering(1)steelprocessingsteelofsurfaceshouldcleannoinjury,paintpollutionandrust,shouldinusingQianeliminationclean,withparticles-likeoroldrustofsteelshallnotusing.Steelmachiningdimensionshallconformtotheconstructiondrawings,processedsteel'ssizeshouldbewithinthetolerancevalue.Steelprocessing(2)steelsteelinstallationprograminstalled(3)weldingofreinforcingsteel,lashingstrapswelded:reinforcementinstrictaccordancewiththerelevantguidelines,horizontalevenverticalbanding,solid.Steelbarconnectionbysolderingorlap,two-sidedweldseamlength5d;single-sidedweldseamlength10d.Laplengthandnotlessthan35d.7.3.4formwork(1)selectionoftemplatesfromtheprojectduetotheface,largeamountofformwork.Accordingtothestructuralarrangementandconstructionplan,usingthefollowingtemplatetypes:1)combinedsteelformworkisusedforfloor,wallandotherparts,trucksdeliveredtotheconstructionsite,assemblingmanual.2)arcarcsegmentofsluiceanddamtemplatethetemplatestillusingsteelformwork,producedaccordingtoPierArcsizespecifications.(2)template-1)combinedsteelformworkusingconventionalconstructionmethods,partmeasuringwireclaspwiththepressatthesitestructuretemplates,andverticalshaft,andtemporaryreinforcement,transversebandontheformwork,onthescrew,andfinalweldingrod,bybus,correctingtemplates,andtemplateandsupportreinforcement.2)templateandscaffoldthequalityofexistingnationalstandardsortradestandards,woodqualitystandardsIIandabovematerialshouldbe.Brittlewooddecay,seriousdistortionsorprohibited.MoldflatnessofthePanelshouldmeetthestandardrequirements,shouldbeassmoothaspossible,pitsarenotallowed,wrinklesorothersurfacedefects.Templatesproduceshouldmeettherequirementsofconstructiondrawingsofthebuildingsstructuralprofile,itsproductiontolerancesuptoSDJ207-822.4.provisionsofarticle1.Slip,amobiletemplate,allowabledeviationofapermanentspecialtemplates,templatedesigndocumentsapprovedbythesupervisoroftheregulations.Templatesaccordingtodrawings二、硬件设计1、硬件方案单片机电子秤硬件方案如图1所示：24位A/D芯片hx711电路单片机主控芯片电源系统液晶显示矩阵键盘称重传感器图1单片机电子秤硬件方案称重传感器感应被测重力，输出微弱的毫伏级电压信号。该电压信号经过电子秤专用模拟/数字（A/D）转换器芯片hx711对传感器信号进行调理转换。HX711采用了海芯科技集成电路专利技术，是一款专为高精度电子秤而设计的24位A/D转换器芯片，内置增益控制，精度高，性能稳定。HX711芯片通过2线串行方式与单片机通信。单片机读取被测数据，进行计算转换，再液晶屏上显示出来。矩阵键盘主要用于计算金额。当被测物体重量得到后，用户可以通过矩阵键盘输入单价，电子秤自动计算总金额并在液晶屏显示。电源系统给单片机、HX711电路及传感器供电。2、称重传感器传感器是测量机构最重要的部件。称重传感器本身具有单调性，其主要参数指标是灵敏度、总误差和温度漂移。(1)灵敏度称重传感器的电灵敏度为满负荷输出电压与激励电压的比值，典型值是reinforcedrateover