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1、Thisarticledescribedthethreedirections(before,left,right)ultrasonicrangingsystemistounderstandthefrontoftherobot,leftandrightenvironmenttoprovideamovementawayfromtheinformation.(SimilartoGPSPositioningSystem)Aprincipleofultrasonicdistancemeasurement1,theprincipleofpiezoelectricultras
2、onicgeneratorPiezoelectricultrasonicgeneratoristheuseofpiezoelectriccrystalresonatorstowork.Ultrasonicgenerator,theinternalstructureasshowninFigure1,ithastwopiezoelectricchipandaresonanceplate.Whenit'stwopluspulsesignal,thefrequencyequaltotheintrinsicpiezoelectricoscillationfrequency
3、chip,thechipwillhappenpiezoelectricresonance,andpromotethedevelopmentofplatevibrationresonance,ultrasoundisgenerated.Conversely,ifthetwoarenotinter-electrodevoltage,whentheboardreceivedultrasonicresonance,itwillbeforvibrationsuppressionofpiezoelectricchip,themechanicalenergyisconvert
4、edtoelectricalsignals,thenitbecomestheultrasonicreceiver.2,theprincipleofultrasonicdistancemeasurementUltrasonictransmitterinadirectiontolaunchultrasound,inthemomenttolaunchthebeginningoftimeatthesametime,thespreadofultrasoundintheair,obstaclesonhiswaytoreturnimmediately,theultrasoni
5、creflectedwavereceivedbythereceiverimmediatelystoptheclock.Ultrasoundintheairasthepropagationvelocityof340m/s,accordingtothetimerrecordsthetimet,wecancalculatethedistancebetweenthelaunchdistancebarrier(s),thatis:s=340t/2UltrasonicRangingSystemfortheSecondCircuitDesignSystemischaracte
6、rizedbysingle-chipmicrocomputertocontroltheuseofultrasonictransmitterandultrasonicreceiversincethelaunchfromtimetotime,single-chipselectionof8751,economic-to-use,andthechiphas4KofROM,tofacilitateprogramming.CircuitschematicdiagramshowninFigure2.Drawonlythefrontrangeofthecircuitwiring
7、diagram,leftandrightinfrontofRangingRangingcircuitsandthesamecircuit,itisomitted.1,40kHzultrasonicpulsegeneratedwiththelaunchRangingsystemusingtheultrasonicsensorofpiezoelectricceramicsensorsUCM40,itsoperatingvoltageofthepulsesignalis40kHz,whichbythesingle-chipimplementationofthefoll
8、owingprocedu
