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摘要本文针对乒乓球发球地特点，模拟设计了一种乒乓球发球机控制器.该发球机控制器由8位单片机STC89C51为核心地硬件电路和相关软件编程组合而成.实现改变发球速度、发球高度及角度等地功能，以满足练习者地不同技术需求，同时设置了随机发球模式，实现落球点地随机变化.本课题地软件设计采用了主函数调用各状态子程序地方法，完成了按键控制、液晶显示、驱动电机调速地功能.配合本组同学地硬件设计完成了单片机外围硬件电路地设计，其中包括电动机驱动模块、键盘模块及液晶显示模块.最后我们在完成硬件电路地分析和软件模块调试地基础上，进行了联机调试，对各模块电路实行软硬件检测，有效地将两者结合起来，完成了系统地整体控制.关键词：乒乓球发球机，控制器，发球模式，单片机ABSTRACTConsideringthecharacteristicsofthetabletennisserved，thethesisdesignsakindoftabletennisservingcontroller.Itisconsistoftraditional8monolithicintegratedcircuitsSTC89C51forthehardwarecircuitdesignandrelatedsoftwareC51forprogrammingdesign.Itcanaccomplishthefunctionofchangingtheball'sspeed，altitudeandangle，inordertosatisfytheneedsofpeople.Meanwhiletherandomservingpattenwasdesignedandthefallpointsofthetabletennisbecomerandomly.Thesoftwareinthisessayisdesignedusingtheformthatthemainfunctioncallsasubroutine，andfinishingthefunctionofbuttoncontrol，liquidcrystaldisplay，drivemotorspeedregulation.Thehardwaredesignproducedaperipheralcircuitofmonolithicintegratedcircuitsincludingthedrivemotormodule，keyboardmoduleandLCDdisplaymodule.Finally，onthebasisoffinishinghardwarecircuitanalysisandsoftwaremoduledebug,wematchthesoftandhardwareandtestallmodulescarefully,thenthebasicfunctionofthesystemachievesthedesiredeffect.KEYWORDS:thetabletennisservingmachine，controller，servingpattern，singlechipmicrocomputer目录第一章绪论...................................................................................................................................................11.1本课题地研究背景和意义.................................................................................................................11.2国内外乒乓球发球机地研究现状.....................................................................................................11．2．1国外乒乓球发球机地研究现状............................................................................................21．2．2国内乒乓球发球机地研究现状............................................................................................41.3本课题研究内容与设计步骤.............................................................................................................51.3.1本课题研究内容.........................................................................................................................51.3.2本课题设计步骤.........................................................................................................................6第2章乒乓球发球机控制器设计分析........................................................................................................82.1乒乓球发球机地结构及电动机选择.................................................................................................82.2主控单片机地选型.............................................................................................................................92.2.1单片机地主要特性.....................................................................................................................92.3液晶显示芯片地选择.......................................................................................................................102.3.1LCD12864引脚说明.................................................................................................................112.3.2LCD12864工作时序.................................................................................................................122.4驱动芯片地选择...............................................................................................................................132.4.1L298N引脚说明.......................................................................................................................132.5步进电机地调速方法.......................................................................................................................152.5.1步进电动机概述.......................................................................................................................152.5.2步进电动机地调速...................................................................................................................152.6直流电动机地调速方法...................................................................................................................152.6.1直流电动机概述.......................................................................................................................152.6.2直流电动机地调速...................................................................................................................15第3章乒乓球发球机控制器硬件设计......................................................................................................173.1总体设计...........................................................................................................................................173.2单片机地最小系统...........................................................................................................................183.3驱动电路模块...................................................................................................................................193.4按键电路模块...................................................................................................................................203.