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1、摘要智能式水果销售过程管理硬件终端实现摘要电子称重具有称重速度快、准确度高、方便灵活的特点，电子称重设备在国民经济各领域的应用越来越广泛，并受到了极大的关注和重视。只具备称重、计价、显示功能还远远不够现代化商业系统要求。如何称重时能将数据上传计算机，实现称重、打印、数据上传及身份识别功能，代替传统的索票索证交易模式，建立智能式水果销售过程管理硬件终端。就此问题，作者查阅了大量工程、文献资料，对上述问题进行详细的研究和探讨。本设计以AT89C51单片机为核心，通过电阻应变式称重传感器将重量转化为模拟电压信号，较小的电压信号通过仪表放大器进行准确、线性放大，以满
2、足模/数转换器对输入信号电平的要求。放大后的模拟电压信号经过AD转换电路将模拟量转变成数字量，然后由单片机控制系统经过数据转换处理后把数字信号存入寄存器。通过单片机将数字信号送入显示电路，由LCD液晶显示屏显示出测量结果，再通过键盘按键输入数字单价，得到总价格等数字显示，而且可以将显示信息上传至微机实现串口通讯功能。通过实验，实现了称重功能和串口通讯，达到了预期目标。关键词：单片机；电阻应变式称重传感器；仪表放大器;LCDⅠAbstractIntelligenttypefruitsalesprocessmanagementhardwareterminalAb
3、stractElectronicweighingwiththeweighingspeed,highaccuracy,convenientandflexiblecharacteristics,electronicweighingequipmentinnationaleconomyinvariousfieldsmoreandmorewidely,andhasbeenofgreatconcernandattention.Onlyhaveweighing,valuation,displayfunctionisfarfromenoughmodernbusinesssy
4、stemrequirements.Howcanuploaddatacomputerweighing,weighingisrealized,printing,datauploadandidentityrecognitionfunction,insteadofthetraditionalvotecablecardtransactionmode,establishmentofintelligenttypefruitsalesprocessmanagementhardwareterminal.Inthispaper,theauthorgivesaproject,li
5、teraturedata,theaboveproblemsaredetailedresearchanddiscussion.ThedesignforAT89C51core,withresistancestraintypeweighingsensorwillweightisconvertedtoanalogvoltagesignal,smallvoltagesignalthroughtheinstrumentationamplifierisaccurate,linearamplifier,ADconvertertomeettherequirementsonth
6、einputsignallevel.TheamplifiedanalogvoltagesignalafterADconversioncircuitanalogintodigitalquantity,andthenbytheMCUcontrolsystemthroughadataconversionprocessingafterthedigitalsignalinaregister.Throughthesingle-chipdigitalsignalissenttothedisplaycircuit,theLCDliquidcrystaldisplaymeas
7、urementresults,throughthekeyboardinputdigitalunitprice,totalprice,digitaldisplay,andthedisplayedinformationcanbeuploadedtothecomputerserialcommunication.Throughtheexperiment,achievethefunctionofweighingandserialcommunications,toachievetheexpectedgoal.Keywords:singlechipmicrocompute
8、r;resistancestrainweighing
