ADVANCEDEV3PROGRAMMINGLESSON

IntroductiontoBluetoothBySanjayandArvindSeshan

ì LearnhowtousetheBluetoothfunctionalityonyourEV3

ì Learntosendandreceivemessages betweenEV3bricks

Objectives

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ì Bluetoothusesradiofrequenciestocommunicatebetweendevices

ì TheEV3usesBluetoothtodownloadprogramswirelessly

ì TheEV3alsousesBluetoothtoconnecttoanotherEV3

WhatisBluetooth?

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ì Coordinatingmultiplerobotsì Havethemperformsimilar

actionsì Synchronizetheiractions

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WhyUseBluetoothontheEV3?

ì Controllingalargesinglerobotwithmultiplebricks

ì Analternativetodaisychaining:Requireslesswiringbutneedsseparateprograms

ì Giveeachbrickanuniquename(SenderandReceiverforthislesson)

ì UseanUSBcablefordownloadingcodetothebricks(ratherthanBluetooth).YoucannotconnectbetweenEV3sandaPCatthesametime

ì Turnonthereceiverrobotfirstthenthesenderinthechallengesinthislesson.ThisisbecausethechallengesolutiononlysendsthemessageonceinChallenge1.

TipsforSuccess

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ActivatingBluetoothontheEV3

ì TurningonBluetooth:ì OntheEV3menu,gotothe

symbolthatlookslikeawrenchì Godowntotheword“Bluetooth”

andactivateit

ì ToconnecttoanotherbrickgobackintotheBluetoothmenuì Goto“Connections”ì Select“Search”andfindtheother

brick’sname

ì YoucanalsomanageyourconnectionswiththeBluetoothConnectionBlock.Butwedonotusethisblockinthislesson.

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ì ThemessagingblockcanbefoundintheBluePallet.

ì YouwillalsousetheWaitForblockinMessagingMode

NewBlock:Messaging

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ì Senda“HelloWorld”messagefromonebricktoanother

ì Thesecondbrickshouldreceiveanddisplaythemessageonitsscreenfor5seconds

ì Tips:ì Youwillneedtopairthetwo

robotsaheadoftimeì NameonerobotSenderandthe

otherReceiverforthischallengeì Forthischallenge,youwilluse

theMessagingblockà SendàText

ì YouwillusetheWaitForblockintheMessagingModeà Changeà Text

Challenge1

Video

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Challenge1Solution

CodeontheSenderRobot

CodeontheReceiverRobot

Sendsthemessage“HelloWorld”totheReceiverrobot.Themessagetitle“Greeting”mustmatchinthereceiver’sprogram.

Waitforamessagefromthefirstrobotanddisplaythetextfor5seconds

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ì Movethefirstrobotbyhandandsendthemotors’powertotheotherrobot

ì Havethesecondbrickreceivethedataandcopythemovement

Challenge2:SynchronizedSwimmers

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Challenge2Solution

CodeontheSenderRobot

CodeontheReceiverRobot

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Readeachofthemotors’powerandsendthemusing twodifferentmessagetitlestotheReceiverrobot

Readthetwodifferentmessagetitlesandapplythereceivedpowervalues

ì OnceyouknowhowtouseBluetoothontheEV3,youcancreatecomplexrobotswheremovement iscoordinatedandsynchronized

ì MasterLeeMagpili’s EagleisanexampleofsuchaprojectwhereBluetoothmessagesareusedtocoordinatehead,legandwingmovement.(Photosandcodepostedwithpermission.) AnotherbrickusesBluetooth toremotelycontroltheEagle.

ì Thisprojectrequires thefollowing partsforthebirdandaremote:ì 5EV3sì 17Motorsì 2TouchSensors

PuttingitallTogether

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TheEagle

ThisissmallpartoftheEagle’scode.HereyouseethattheEaglehasfivemodes.Inthisview,youseethatmessagesarebeingsentto“Legs1”and“Wings”EV3bricks.

ThankyoutoMasterLeeMagpili forsharinghiscodewithEV3Lessons.