基于at89c51的数字电子秤的设计

1电子称设计方案目录电子技能课程设计报告书错误未定义书签。基于AT89C51的数字电子秤的设计11、设计目的12、设计的主要内容和要求13、整体设计方案131设计方案132工作原理14、硬件电路的设计25、软件设计351主程序设计352LM4229液晶显示驱动程序453ADC0832采样程序55444键盘程序66、系统仿真67、使用说明98、设计总结9参考文献9附录A101基于AT89C51的数字电子秤的设计1、设计目的单片机以其功能强，体积小，功耗低，易开发等很多优势被广泛应用。但单片机不是万能的，也存在不适合的场合，我们要充分利用单片机的内部资源和选择合适的单片机来完成我们的设计。本数字电子秤的设计过程中需要用到A/D转换、键盘、液晶显示、复位电路和蜂鸣器报警驱动电路的知识，同时在软件的设计过程中需要用到键盘扫描、液晶显示驱动、模数转换程序及汉字库的的设计，可以很好的将数电、模电、单片机知识进行综合应用。在综合应用中进一步熟悉单片机设计的开发各个流程，最终达到“巩固基础、注重设计、培养技能、追求G2031G7044、G17220G2533G4466用G5的G11458的。G32、设计的主要内容和要求本G7003G1039要完成一个G12628单G4466用数字电子秤的G11840件电路部分和软件部分的设计。在设计的过程G4410G1262G1363用单片机G4557数字电子秤的各G12193功能进行G6523G2058。本设计中的数字电子秤要求能G3827显示G2842G2709的G2529G12228、G1227G7696、G5647G18339、G5647G1227等G727能G3827G14270动完成G2842G2709的G1227G7696计G12651G727能G3827G1660存G1972G12193G12628单G2842G2709的G1227G7696G727能G3827G1867G7389G17241重G6564G18278功能，一G7098重G18339G17241G1998G1114G14270G17535重G18339的G8991G18339的G14551G3272，发G1998警报G727同时G4557数字电子秤的G8991G18339G14551G3272要达到G24G46G42，G8991G18339G12946G5242要求达到G19G17G19G19G20。3、整体设计方案31设计方案G3G6984个数字电子秤电路G11013电源电路、单片机G1039G6523G2058电路、G47G48G23G21G21G28显示电路、蜂鸣器报警电路、G23G13G23键盘电路和G2399G2159G1268G5875电路G11G36G39G38G19G27G22G21G18331G7691G709G25个部分G13464成。G3926G3282G22G17G20G6164示。G332工作原理G6183开电源开G1863，数字电子秤开G3999G5049G1328。G6521G17902电源时，数字电子秤进G1849G8438G17826G11040G19766G256G8438G17826G1363用电子秤G3设计G103G103G103G103G103G103G257。G8504时数字电子秤G990G48G38G56开G3999G5049G1328，键盘不G7041进行扫描，同时G3G17902过G36G39G38G19G27G22G21也不G7041进行G3818部G12228G18339数G6466G18331G7691，G47G38G39G990显示G256G44662用电子秤G3G2529G12228G3单G1227G103G103G103G103G103G103G257。G5415G17745G10301G2500G990G6930G7389G10301体时，G36G39G38G19G27G22G21G12447G2375将数G6466G6922G19610G17877G13485单片机G3800G10714。G8504时G5049G1328G1166G2604G2494要G17767G1849G4557应G2842G2709的G1207G11733G13546G2507，在G21G23G19G13G20G21G27的G47G38G39G990可以G11487到G11468应G2842G2709的G2529G12228，单G1227，G5647重，G5647G1227G7696等G1461G5699。在G12228G18339的过程中，一G7098G10301体G14270G17535的重G18339G17241G1998电子秤的G12228G18339G14551G3272，蜂鸣器G12447G2375G1262发G1998G256G9416G9416G103G103G103G103G257警报G3780告诉G5049G1328G1166G2604，G6164G12228G18339G10301G2709G17241重。A1A2A0A3A6A4A5A7A8A9A14、硬件电路的设计数字电子秤G18331用G36TG27G28G38G24G20单片机G1328为微G3800G10714器，G6521口电路G11013晶振、G47G48G23G21G21G28显示电路、G23G13G23按键电路、G36G39G38G19G27G22G21电路、报警电路、存G1660器等G13464成。G6523G2058器系统的G11840件电路原G10714G3282G3926G3282G23G17G20G6164示。G3G6523G2058器系统G11840件电路的G5049G1328过程是G6183开电源时，G48G38G56及各个部分电路开G3999G5049G1328，G48G38G56调用内部存G1660数G6466G4557各部分G6521口电路初G3999化。G21G19G19MS后G47G48G23G21G21G28进G1849G8438G17826G11040G19766，G36G39G38G19G27G22G21不G7041G4557G3818部数G6466进行G18331G7691交G13485G48G38G56进行G3800G10714，一G7098G7389G10301G2709G6930G1849G17745G10301G2500，G36G39G38G19G27G22G21G12447G2375发G17877中G7041请求，并将本次G18331G19610数G6466交G13485G48G38G56G3800G10714，之后G47G48G23G21G21G28显示G11468应数G6466G18339。在G8504过程中，键盘也在不G7041进行扫描，一G7098G7389键按下，单片机也G1262G4557其数G6466进行G11468应G3800G10714，然后将G4557G47G48G23G21G21G28进行写操G1328。G33G3A1A12A0A3A13A10A11A14A15A16A17A11A18A1G35、软件设计本设计中的程序G11013G1039G6523G2058程序、G47G48G23G21G21G28液晶显示驱动程序、G36G39G38G19G27G22G21G18331G7691程序和G23G13G23键盘程序G13464成。G351主程序设计G6984个设计中G18331用G11013下G2533G990的设计思路。G1039程序中G1039要完成G4557G47G38G48G23G21G21G28、G36G39G38G19G27G22G21、及键盘扫描程序的调用。在G13546写程序的过程中，各变G18339统一G18331用全局变G18339方式命G2529，同时考虑到电子秤G4557G12946G5242的要求，本设计中的G1227G7696及G5647G18339G11468G1863的变G18339全部G18331用浮点数。G1039程序流程G3282G3926G3282G24G17G20G6164示。4G3A1A21A0A3A22A19A20A23A19A1G352LM4229液晶显示驱动程序A1A21A0A24A25A26A12A24A24A27A30A28A29A31A32A33A19A20A23A19A15G3G3G3G3G3G47G48G23G21G21G28液晶能G3827显示比较复杂的汉字和G3282形，首先必须G4557其写G1849G6523G2058操G1328字，包括G3282形的显示方式，字体的模式。然后写G1849初G3999行地址，指针G14270动左移，直到写完全部数G6466为止。G3G3G3G3G3G3G3G3G3G3G3WRITE_DATAG11PLACEG3G3G3/写G1849地址高位G3G3G3G3G3G3G3G3G3G3G3WRITE_DATAG11PLACE/G21G24G25G3G3G3G3/写G1849地址低位G3G3G3G3G3G3G3G3G3G3G3WRITE_COMG11G19XG21G23G3G3G3G3G3G3G3G3G3G3/地址设置G3G3G3G3G3G3G3G3G3G3G3WRITE_COMG11G19XBG19G3G3G3G3G3G3G3G3G3G3/设置数G6466G14270动写G3G3G3G3G3G3G3G3G3G3G3WRITE_DATAG11G36SG38_G48SG46G11CG20G19XG21G19G13G20G25KG3/G13例G3926G19的G36SG38IIG11733为G19XG22G19,G3G3G3G3G3G3G3G3G3G3G3在G36SG38_G48SG46中的位置为G19XG20G19G13G20G25G3G20G25字节字G11733依次写G1849G47G38G39G13/G3G3G3G3G3G3G3G3G3G3G3WRITE_COMG11G19XBG21G3G3G3G3G3G3G3G3G3G3/G14270动复位G3G3G3G3G3G3G3G3G3G3G3PLACEPLACEG22G19G353ADC0832采样程序G3G3G3G3G3G3G3G3G3G3G3G3G3G3G3G3G3G3G3G3G3G3G3G3G3A1A21A0A2A34A35A36A37A38A2A24A41A39A19A20A19A20A23A19A1G3G3G3G3G3G48G38G56G17902过拉低G38S、拉高G38G47G46来启动G36G39G38G19G27G22G21进行G3818部G2399G2159G1268G5875转换后的电G2399G14616G2507进行G18331G7691，每产生G27个G38G47G46脉冲，G39G36TG36获得一位完G6984的G27BIT数G6466，G8504时G48G38G56发G17877中G7041请求，拉高G38S，拉低G38G47G46,并将数G6466G39G36T返回。5444键盘程序G3G3G3G3A1A21A0A12A12A40A12A44A42A19A20G3G3G3G3G3G3本设计中G18331用G1114G23G13G23矩阵式键盘，单片机定时进行查询。首先单片机发G17877行扫描G1207G11733，然后进行列扫描，G5415发现某一列G1998现G1114低电平时，G2375返回G11468应的键盘值。若没G7389发现则说明G5415前行没G7389键按下，行扫描右移一位，继续执行列扫描。G3G48G38G56根G6466G11468应的键值，G2375可确定被按下的键。G36、系统仿真在PROTUES的ISISG37G17G23SPG21软件环境下画G1998电路原G10714G3282，G6521下来就是将设7计的程序在KEILC51VISION3开发G19610成环境G990G13546G16805成机器G16833G16340，进G1849G51ROTG88ES的ISIS，G2464G1999G36TG27G28G38G24G20，在G5G51ROG74RAMG3G41ILE中G5G9167G2164G5MAIG81G17G75EXG5G7003件到G36TG27G28G38G24G20中，G3926G3282G25G17G20G6164示。G3G3G3G3G3G3G3G3G3G3G3G3G3G3G3G3A1A46A0A3A13A10A11A14A15A43A45A5A47A1G3G3G16825G1235G11507G20576G16789的过程首先按开G3999按，G8504时数字电子秤进G1849G8438G17826G11040G19766。G47G48G23G21G21G28G3G990显示G5G8438G17826G1363用电子秤G3设计G103G103G103G103G103G5。G3926G3282G25G17G21G6164示。G3A1A46A0A24A13A10A11A14A15A48A49A50A51A1G3G6521下来调节G2399G2159G1268G5875模G6323电路电G2399，将电G2399设为G19G17G19G19G15932示G8504时G17745G10301G2500G990没G7389G10301体。G8504时G47G48G23G21G21G28G2011换到G12228G18339画G19766。显示指示G256G4466用电子秤G3G2529G12228G103G103G103G103G103G103G38单G1227G19G17G19G19G19G1815/G2327G1823G3G5647重G18339G19G17G19G19G19G2327G1823G3G5647G1227G19G19G17G19G19G19G1815G257。G3926G3282G25G17G22G6164示。A1A46A0A2A13A10A11A14A15A52A53A54A55A1G3G3G3G3最后，G990调G2399G2159G1268G5875电G2399G15932示G5062G17745G7389G2842G2709，同时按下G256G25G257G2507键，G15932示选择G25G2507G2842G2709G256G14541G7536G257。G8504时G47G48G23G21G21G28G990显示G256G2529G12228G14541G7536G3单G1227G25G17G27G19G19G1815/G2327G1823G3G5647重G18339G22G17G23G28G25G2327G1823G3G5647G1227G256G21G22G177G22G22G1815G257G708G4466G19481G25G17G27G13G22G17G23G28G25G21G22G1777G24G27G1815G709。达到基本要求。G3926G3282G25G17G23G6164示。最G3835G12228G18339重G18339G23G17G28G27G19G46G42,G3926G3282G25G17G24G6164示。G3A56A57A58A59A60A61A62A63A64A65A66A67A68A69A70A71A72A569A1A46A0A12A13A10A11A14A15A52A53A73A74A75A76A77A78A43A45A17、使用说明G3G3G3G3在G1363用G1235G11507的过程中，首先G6183开G1235G11507电路G3282，并G2164G17745好G256G43G40G59G257G7003件到单片机中。后将G2399G2159G1268G5875电G2399调G2058G19G17G19G19，点G1999按G19074，开G3999G1235G11507。G708为G1114能G3827G11487到G9177G7236的G9448示过程，请将电路的G13984G7235设为G7092。G709G6984个电子秤设置G1114G256G19G97G20G24G257个按键，其中的G256G19G257键G15932示G2474G9052，其G1194键G1207G15932G20G24G12193可G1391选择G2842G2709G1227G7696。G708G2490本设计的G1235G11507G7003件需要G4445G16025PROTG88ES7G17G23以G990G10268本G6177能G6183开。G7098、设计总结G17902过本次电子技能G16850程数字电子秤的设计，G16765我G7368G2164熟悉G1114单片机的G6984个设计流程。在设计过程中，我也G5859识到好的G13546程G1082写G1076G5827G4557软件设计的重要G5627。G2030G2030开G3999G11013G1122G14270G5061变G18339G3835部分G18331用的是局部变G18339，G4560G14280程序G1235G11507G1998G19181，G13485G14270G5061的G1474G6925G2031G17908不小的G21647G9914。G13475过一G3837的G2174G2159，统一G18331用全局变G18339终G1122G4466现最终的G1235G11507G13479G7536和设计的全部G1231G2165和要求。G5415然本数字电子秤G17836G7389很多可以G6925进的地方，例G3926可以G6925进按键功能方G1427G5049G1328G1166G2604G19555时G4557各数G6466进行G1474G6925等等。G11013G1122设计时G19400G7389G19492，G2494能在以后的G4410G1076过程中G1582G7368进一步的G6925进。参考文献A79A80A81A82A83A84A85A80A86A87A88A89A90A91A92A93A94A95A82A96A97A98A99A100A101A102A103A104A105A79A106A81A84A107A108A109A110A111A112A113A114A115A116A117A118A119A119A120A109A120A120A121A122A123A84A79A118A81A124A125A126A84A86A87A88A127A128A129A130A93A79A106A81A84A131A132A109A131A132A110A111A133A134A135A136A114A115A117A118A119A119A118A109A137A138A121A139A120A8410A79A138A81A140A141A142A84A86A87A88A143A144A145A146A79A106A81A84A107A108A109A107A108A147A148A147A149A135A136A114A115A117A118A119A119A119A109A138A137A121A123A85A84附录AA150A151A152A153A154A155A156A157A158A159A157A160A85A80A84A161A162A150A151A152A153A154A155A156A157A158A151A152A163A159A151A152A164A84A161A162A150A151A152A153A154A155A156A157A158A165A166A164A165A153A153A84A161A162A150A151A152A153A154A155A156A157A158A167A165A163A161A84A161A162A150A151A152A153A154A155A156A157A158A154A167A123A118A118A122A84A161A162A150A156A157A168A151A152A157A155A153A161A165A159A155A152A164A151A160A152A157A156A153A161A165A159A150A156A157A168A151A152A157A155A151A152A163A155A152A164A151A160A152A157A156A151A152A163A164A166A151A163A169A170A89A171A172A173A138A174A85A175A164A166A151A163A169A170A170A176A172A173A138A174A139A175A164A166A151A163A169A170A170A177A172A173A138A174A139A175A164A166A151A163A169A170A89A178A179A172A173A138A174A137A175A155A151A152A163A180A80A117A181A80A117A182A80A172A119A117A183A80A175A155A153A161A165A159A165A156A184A156A165A163A165A117A185A117A152A117A167A117A157A117A152A155A167A117A164A175A186A186A187A188A189A190A191A155A151A152A163A163A157A167A192A80A175A164A166A151A163A166A157A157A192A172A173A138A174A119A175A153A161A165A159A192A159A157A164A164A184A156A165A163A165A175A186A186A193A194A195A196A190A191A86A197A168A154A198A165A163A192A159A157A164A164A175A155A152A164A151A160A152A157A156A153A161A165A159A165A156A184A165A154A165A159A167A117A163A157A167A192A175A186A186A199A200A189A190A191A86A197A155A152A164A151A160A152A157A156A153A161A165A159A165A166A153A79A85A81A172A201A123A120A117A123A137A117A123A120A117A123A120A117A123A120A202A175A155A152A164A151A160A152A157A156A153A161A165A159A192A159A151A153A157A184A165A154A154A79A137A81A172A201A123A120A117A123A120A117A123A137A117A123A120A117A123A120A117A123A120A202A175A168A154A198A165A163A192A159A151A153A157A184A155A152A151A163A79A80A119A81A172A201A85A84A85A117A118A84A120A117A138A84A137A117A123A84A85A117A85A84A120A117A137A84A120A117A139A84A122A117A120A84A119A117A122A84A85A117A119A202A175A186A186A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