基于单片机控制的电子称的设计摘要本文设计的电子秤以单片机为主要部件，用C语言进行软件设计，硬件则以传感器、放大系统、A/D转换系统、CPU控制系统、LCD显示系统、报警系统及键盘控制系统七个部分组成。通过对电路输出电压和标准重量的线性关系，建立具体的数学模型，将电压量纲（V）改为重量纲（g）即成为一台原始电子秤，在此基础上增加了LCD显示、键盘控制及阈值报警功能，随时可改变上限阈值，调节单价，去皮处理，显示总价格的功能，使本产品智能化，符合现代社会电子信息化的要求。关键词：单片机，传感器，A/D转换，LCD显示，阈值报警THEDESIGNOFMCU-BASEDELECTRONICWEIGHERABSTRACTInthispaper,SCMwaschosenasthemaincomponentoftheelectronicweigher.SoftwareprogramwasdesignedbyusingClanguage,andthehardwarecontains7parts:sensor,amplificationsystem,A/Dconversionsystem,CPU,LCDdisplaysystem,alarmsystemandkeyboardcontrolsystemcircuit.Byexaminingthelinearrelationshipbetweentheoutputvoltageandthestandardweight,aspecificmathematicalmodelwasestablished,andthenweshouldchangethevoltagedimensionality(V)toweightvoltage(g),thusaoriginalelectronicweigherwasobtained.Onthisbasis,theelectronicweighercanbeintelligentizedbyaddingLCDdisplaysystem,keyboardcontrolsystemandthresholdalarmsystem.Theupperthresholdandtheunitpriceoftheelectronicweighercanbechangedatanytime,andthetotalpricecanbedisplayedontheLCD.Thisintelligentizedproductmeetstherequirementsofthiselectronictimes.KeyWords:SCM,sensor,A/Dconversion,LCDdisplay,thresholdalarm目录摘要...................................................................................................................................................IABSTRACT......................................................................................................................................II目录..................................................................................................................................................III第1章绪论.................................................................................................................................11.1引言.....................................................................................................................................11.2本设计在国内外的研究现状.............................................................................................11.3本设计的选题及意义.........................................................................................................2第2章总体方案设计.................................................................................................................32.1显示器的选择方案.............................................................................................................32.2AD芯片的选择方案...........................................................................................................32.3CPU的选择方案.................................................................................................................42.4总体方案的设计.................................................................................................................4第3章硬件设计.........................................................................................................................63.1传感器的设计.....................................................................................................................63.1.1电阻应变式传感器的组成及原理...............
