基于单片机智能存储的数字电压表的设计 201...

摘要随着电子科学技术的发展，电子测量成为广大电子工作者必须掌握的手段，对测量的精度和功能的要求也越来越高，而电压的测量甚为突出，因为电压的测量最为普遍。本设计介绍了基于AT89S52单片机为核心的、以ADC0809数模转换芯片采样、以1602液晶屏显示、以6264作为片外数据储存器的数字电压表。硬件系统由量程转换、调理电路、ADC0809转换器、显示电路、存储电路和单片机AT89S52构成，A/D转换器在单片机的控制下完成对模拟信号的采集和转换功能，对电压进行显示并存储，在实现基础功能要求之上扩展了串口通讯、时钟功能、高压报警、短路测试、电阻测量、交流电压峰峰值和周期测试等功能，使系统达到了良好的设计效果和要求。此设计通过调试完全满足设计的指标要求，电路设计简单，设计制作方便有较强的实用性。关键词：AT89S52；模数转换；液晶显示；数据存储；语音输出ABSTRACTWiththedevelopmentofelectronicscienceandtechnology,electronicmeasurementbecomethee-workermusthavethemeans,themeasurementaccuracyandfunctionalrequirementsofincreasinglyhigh,whilethevoltagemeasurementisverystrong,becausethevoltagemeasurementofthemostcommon.Thisdesigndescribesthecore-basedMCUAT89S52todigital-analogconverterchipsamplingADC0809to1602LCDscreendisplayto6264asadatastoragechipwithvoltagemeasurementfunctionandhasaprecisiondigitalvoltmeter.SpecificallybytheADC0809converterandmicrocontrollerAT89S52composition,A/DconverterunderthecontroloftheMCUtocompletetheanalogsignalacquisitionandconversionfunctions,andfinallycollectedbythedigitalcontrolvoltagevalues,basedonfunctionalrequirementsintherealizationofextensionoftheserialportoncommunication,clockfunction,high-pressurealarm,short-circuittest,resistancemeasurement,ACvoltagepeakvalueandthecycleoftestingandotherfunctions,thesystemdesigntoachievegoodresultsandrequirements.Thisdesignfullymeetsthedesignthroughthecommissioningofthetarget,circuitdesignissimple,designedtofacilitateastrongerpractical.Keywords:AT89S52；A/D；LCDexpansion；DataStorage；Voiceoutput湖南科技大学本科生毕业设计（论文）-i-目录第一章引言.................................................................................................11.1课题选择及其研究背景.............................................................................................11.2智能仪表目前发展状况.............................................................................................11.2.1智能仪表的优点..............................................................................................21.2.2智能仪表的技术及应用..................................................................................31.3论文的研究目的.........................................................................................................41.4论文的研究要求.........................................................................................................4第二章数字电压表的原理.................................................................................52.1数字电压表的简介.....................................................................................................52.2数字电压表的特点.....................................................................................................52.3数字电压表的基本原理与分类.................................................................................6第三章系统硬件设计方案与实现...................................................................103.1总体硬件设计方案...................................................................................................103.1.1系统总体硬件电路图....................................................................................103.1.2系统总体硬件方框图....................................................................................103.2系统核心芯片...........................................................................................................103.2.1AT89S52的基础电路.....................................................................................113.2.2AT89S52的功能特性.....................................................................................113.3系统的硬件电路设计...............................................................................................133.3.1电源电路........................................................................................................133.3.2显示电路........................................................................................................133.3.3复位电路........................................................................................................153.3.4输入电压变换电路........................................................................................163.3.5A/D采样电路.................................................................................................173.3.6数据存储电路................................................................................................203.3.7语音输出电路................................................................................................253.3.8RTC8025芯片介绍........................................................................................273.3.9时钟芯片与单片机的连接............................................................................293.3.10串口通讯......................................................................................................303.3.11键盘电路......................................................................................................33湖南科技大学本科生毕业设计（论文）-ii-第四章系统软件的研究与设计........................................................................344.1软件功能的实现.......................................................................................................344.1.1液晶显示的实现.................................