ramping up speed - ev3 lessonsev3lessons.com/en/programminglessons/advanced/rampup.pdfwhy ramp up...

ADVANCEDEV3PROGRAMMINGLESSON

RampingUpSpeedBySanjayandArvindSeshan

ì Learnwhatrampupmeans

ì Learnhowandwhentouserampup

ì LearnhowtousetheTimerBlock

ì Prerequisites:DataWires,MyBlockswithInputs&Outputs

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LessonObjectives

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WhyRampUp

• Rampingupspeedisveryhelpfulwhenrunningfast-pacedprograms

• Usually,iftherobotstartsupwithhighspeed,thentherewouldbeasmalljoltinthebeginning.Thejoltmaychangethepositionoftherobot.

• Withtherampup,itwouldstartupslowlyandincreasespeedovertime (seevideoontheright)

ì Thetimerblockisusedtocounttime

ì ItisfoundintheYellow(sensortab)intheEV3Software.

ì Multipletimersareavailable(upto8timers)

ì Youcanusetheblocktoresetaspecifictimerbackto0seconds

ì Youcanusetheblocktooutputthetimesincereset…

ì IfyouareanFLLteam,youcanusetimerstotracktimeorfortherampupcodeinthislesson

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NewTool:TimerBlock

Timer#

Elapsedtimeforthattimer

1.Resettimer

2.Inaloop,readthenumberofsecondspassedandmultiplythepowerby20.

3.Stillintheloop,taketheresultofthemultiplicationandconnectittothemoveblock.

4.RepeattheLoopfor5seconds

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RampUpin4EasySteps

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BaseRampUp

CodebyMesaRoblesRobotworks.ModifiedbyDroidsRobotics

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RampUpChallenge

Step1:Canyounowmakearampupprogramthattakes2inputs(totaldurationoframpupandhowmuchyouwantthemotortorampuppersecond)?CreateaMyBlock.

Step2:Rampupyourrobot,thenmoveuntilablackline.

A. Highlightalltheblocks(withoutstopblock)thengotoMyBlockBuilder

B. Add2inputs:oneforhowquicklyyouwanttorampupandoneforandseconds

RefertotheMyBlockswithInputs&OutputslessonifyouneedhelpsettinguptheMyBlock

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MakingtheMyBlock

B

A

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WiretheMyBlock

CodebyMesaRoblesRobotworks.ModifiedbyDroidsRobotics

howquicklyyouwanttorampup

Secondstorampup

Wirethe “Howquicklyyouwanttorampup” input totheMathBlockandtheSecondsinput totheMoveSteeringblock

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ChallengeSolution

CodebyMesaRoblesRobotworks.ModifiedbyDroidsRobotics

1. Whatisrampingup?Ans.Rampingupisstartingslowandgettinggraduallyfaster.

2. Whyshouldyoubother?Ans.Rampingupcanreducesuddenjerkinrobotmovement.

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DiscussionGuide

ì Thinkaboutwhatelseyoumightbeabletouseatimerblockfor.

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NextSteps

ì ThiscodeforthistutorialwascreatedbyMesaRoblesRobotworks (mesarobotworks@gmail.com)

ì SanjayandArvindSeshan addedcontenttocomplementtheoriginallesson(team@droidsrobotics.org)

ì Morelessonsatwww.ev3lessons.com

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Credits

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.