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By Sanjay and Arvind Seshan INTERMEDIATE PROGRAMMING LESSON MOVE DISTANCE MY BLOCK (MOVE_CM)

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Page 1: INTERMEDIATE PROGRAMMING LESSONINTERMEDIATE PROGRAMMING LESSON MOVE DISTANCE MY BLOCK (MOVE_CM) Lesson Objectives 1. Create a useful My Block 2. Learn why creating a My Block that

BySanjayandArvindSeshan

INTERMEDIATEPROGRAMMINGLESSON

MOVEDISTANCEMYBLOCK(MOVE_CM)

Page 2: INTERMEDIATE PROGRAMMING LESSONINTERMEDIATE PROGRAMMING LESSON MOVE DISTANCE MY BLOCK (MOVE_CM) Lesson Objectives 1. Create a useful My Block 2. Learn why creating a My Block that

LessonObjectives1. CreateausefulMyBlock

2. LearnwhycreatingaMyBlockthattakesmeasurementsmadewitharulercanbeuseful

3. MakeaMove_CMMyBlock

Prerequisites:MovingStraight,PortView,MyBlockswithInputsandOutputs,MathBlocks,DataWires

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Page 3: INTERMEDIATE PROGRAMMING LESSONINTERMEDIATE PROGRAMMING LESSON MOVE DISTANCE MY BLOCK (MOVE_CM) Lesson Objectives 1. Create a useful My Block 2. Learn why creating a My Block that

WhyaMoveDistanceMyBlock?Built-inmoveblockswillnottakeinputs(values)incentimetersorinches.

Itismucheasiertomeasuredistancewitharulerthandegreesorrotations.

Ifyouchangeyourrobotdesigntohavebiggerorsmallerwheelslateron,youdon’thavetore-measureeverymovementofyourrobot◦ Insteadofchangingdistancesineverysingleprogramyouwrote,justgointoyournewMoveDistanceBlockandchangethevalueforhowmanyinches/cmonemotor rotationwouldtake.

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MOVE_CMINTHREEEASYSTEPSSTEP1:Determinehowmanymotordegreesyourrobotmovesin1cm

STEP1A:WheelMeasurement

STEP1B:Programtherobottomove1cm

STEP2:AddaMathBlocktoconvertcentimeterstodegrees

STEP3:CreateaMove_CMMyBlockwith2inputs(poweranddegrees)

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Step1A:HowManyDegreesDoesTheRobotMovein1CM?

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Method1:1. Lookupthewheelsizeinmmprintedonyourtireanddivideby10toconvertto

cm(because1cm=10mm)2. Multiplytheanswerinstep1byπ (3.1415…)tocomputecircumference3. Divide360degreesbyvaluefromstep2.Thiscomputesdegreesin1cmsinceyou

travelonecircumferencein1rotationand1rotationis360degrees

ExamplecalculationusingthestandardEV3Edu45544setwheels:

1. EV3EDU(45544)wheelsare56mm=5.6cmindiameter

2. 5.6cm× π =17.6cmperrotation3. 360degrees÷ 17.6cm=20.5motordegreespercm

Helpful chartwithcommonLEGOwheelsandtheir

diameters.

http://wheels.sariel.pl/

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Step1A:AlternativeMethod

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AlternateMethod:UsePortViewtofindtheMotorDegreesvalue.Usethismethodifyoucannotfindthediametervalueprintedonyourwheel.

1. Putyourrulernexttoyourwheel/robot at0centimeters(whateverpartoftherobotyouusetoalignwith0,youshouldusetousetomeasuredistanceinstep2)

2. Rollyourrobotforwardanyamountofcentimeters,makingsureyourrobotdoesnotslip.

3. Takethedegreereadingyouseeonthescreenforthemotorsensoranddividebytheamountofcentimetersyoumoved.

4. Theanswerwillbethenumberofdegreesyourrobot'swheelsturn in1centimeter.

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Step1B:ProgramMove1CM

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UsetheMotorDegreesvalueyouobtained foryourrobot inslides5or6

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Step2:DegreetoCMConversion

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CreatetheCalculatorthatcovertsdegreestocentimeters

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Step3A:SetuptheMyBlock• A.HighlightthetwoblocksinStep2

andgotoMyBlockBuilder

• B.Addtwoinputs:PowerandCentimetersandcompletethesetupprocess.

• IfyouneedhelpintheMyBlockBuilder,refertotheMyBlockwithInputsandOutputsLessoninIntermediate

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B

A

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Step3B:WiretheMyBLOCK

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C.Wiretheinputs inthegreyblock.ThecentimetersinputconnectstotheMathBlock.ThepowergoesintotheMoveSteeringBlock’spowerinput.TheresultoftheMathBlockiswiredintothedegreesinput intheMoveSteeringBlock.

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Step3C:CompletedMove_CM

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DiscussionWhyisaMove_CMMyBlockuseful?◦ Youcanmeasuredistancesincentimetersandinput thisnumber intoyourblockinsteadofprogramming indegreesorrotations

WillchangingtheinputsinonecopyofMove_CM impactanothercopyofit?◦ No.ThatisexactlywhyaMyBlockisuseful.Youcanusethesameblockmultiple times,eachtimeusingadifferentnumber forpowerandcentimeters(oranyotherparameteryousetup).

CanyoualteraMyBlockafteritismade?◦ Youcanchangeanyofthecontents,butnotthegreyblocks(input andoutputparameters).Ifyouneedtomakechangestotheparameters,youmustremakeyourMyBlock.

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Page 13: INTERMEDIATE PROGRAMMING LESSONINTERMEDIATE PROGRAMMING LESSON MOVE DISTANCE MY BLOCK (MOVE_CM) Lesson Objectives 1. Create a useful My Block 2. Learn why creating a My Block that

CREDITSThistutorialwascreatedbySanjaySeshanandArvindSeshan

Morelessonsareavailableatwww.ev3lessons.com

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


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