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1、序号:电子实训题目新型车速监控装置学生xxxxxxxx学院xxxxx专业班级xxxxx校内指导教师xxxxxxx专业技术职务xxxxxx校外指导老师专业技术职务二○一三年六月新型车速监控装置的设计摘要:本文设计一款用于实时监控车辆行驶过程中速度变化的装置。系统以STC89C51单片机为控制核心,ADC0809芯片将检测到的模拟信号转化成数字信号,74LS138是为了将三个端口转为八位输出,74HC245增强负载输出,OP07构成的反相器用来将采集到的负值转为正值,拨码开关作为系统输入设备用来选择对应的程序,NOKIA5110液晶显
2、示器用于系统参数显示。该车速监控装置是根据预先设置的速度(电压值)范围,对给定的电压值进行检测。实现以下功能:①实时动态超速报警:系统运行时,能实时监测限速范围,一旦车辆超出该范围,即发出声光报警。②实时动态限速:系统运行时,能实时监测限速范围(LCD显示),并自动根据限速范围限制车行速度(通过控制电压实现)。③动感显示:用8只发光管排成圆形,依次点亮,以显示车辆前进、倒退和行驶速度。点亮时间与行驶速度成反比。前进时,发光管顺时针点亮;倒退时,发光管逆时针点亮。④实时监测并数字显示车辆行驶速度和限速范围(LCD显示)。⑤三档功能转
3、换:0挡-关闭功能①和②;1档-开启功能①;2档-开启功能②。实验结果表明,该设计具有成本低、可靠性高、测量精度高、安装调试方便等特征,非常适用于厂家提高车辆速度智能化控制程度,提高市场竞争力,具有较好的应用前景。关键字:车速;实时监控;STC89C51;LCD显示;声光报警TheDesignoftheNewSpeedMonitoringDeviceAbstract:Inthispaper,thesoftwareofreal-timemonitoringspeedchangesofvehiclewasdesigned.Thisco
4、ntrolsystemtakestheSTC12C89C51microcomputerasitscore.WeusetheADC0809chiptodetecttheanalogsignalsintodigitalsignals,use74LS138toturnthethreeoutputstoeight,use74HC245toenhancetheoutputoftheload.Meanwhile,theinvertermadeupofOP07isabletoturnnegativetopositive.Wealsousedia
5、l-codeswitchastheinputdevicetoselectthecorrespondingprogramsystem,andNOKIA5110LCDdisplayforsystemparameters.Thedeviceisdesignedforagivenvoltagefortesting,accordingtoapresetspeedrange(voltage).Functionasfollows:①Real-timedynamicoverspeedalarm:Whenthesystemisrunning,itc
6、anreal-timemonitorthespeedlimit.Oncethevehicleisbeyondthescope,itwillsendoutsoundandlightalarm.②Real-timedynamicspeedlimit:Whenthesystemisrunning,itcanreal-timemonitorthespeedlimitrange(LCDdisplay),andautomaticallylimitthecarspeedrange(bycontrollingthevoltage),accordi
7、ngtothespeedlimit.③Lightshow:Weuseeightlight-emittingtubearrangedinround,lightinorder,todisplaythevehicleforward,backwardandmovingSpeed.Lighttimeisinverselyproportionaltothespeed.Whenforward,Light-emittingtubelightsclockwisely;Backward,light-emittingtubelightsreversel
8、y.④Real-timemonitoringanddigitaldisplayvehicletrafficspeedandspeedrange(LCDdisplay).⑤Threefunctiontransformation:Swith0-turn