ADVANCEDEV3
PROGRAMMINGLESSON
DataLogging(Part2)
BySanjayandArvind Seshan
LessonObjectives
ì Learnwhatdataloggingis
ì LearnthedifferentwaysofdoingdataloggingontheEV3
ì LearnhowtousetheDataLoggingBlock
ì Prerequisites:MustownEduversionofEV3Software
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WhatisDataLogging?
ì TheEV3softwareprovidesasimplewaytocontinuouslyrecord
sensorreadingstoafileandtoplotthevalueslater.Thisis
calledDataLogging.
ì WhyuseDataLogging:
ì Greatforscienceexperiments.InPart1,wewillshowhowyou
canrecordvaluesliketemperatureforascienceproject.
ì Greatforunderstandingrobotprogrammingblocks.InPart2,we
willshowhowtousedataloggingtomeasurethedifference
betweenturns.
ì Greatforunderstandingsensorbehavior.InPart3,wewillshow
howtousedataloggingtounderstandthedetailsofsensorssuch
asthegyrosensor.
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HowdoyouDataLogonanEV3?
Thereare4waystodatalog usingtheEV3MINDSTORMS:
LiveDataLogging:Realtimedatacollecteddirectly
intheEV3software
2. RemoteDataLogging:Usethethebricktocollect
data,andtransferthedatatothecomputerfor
analysis
3. BrickDataLogging:Runtheexperimentdirectly
fromthebrick
1.
Lesson1:
Temperature
Sensor
Experiment
Lesson2:
Differences
BetweenTurns
4.
Autonomous.CollectdatawiththeDataLogging
block.Thedataisstoredonthebrick.
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AutonomousDataLogging
Filename
Autonomous Data
Logging requiresthe
DataLogging Block
Port
Add moresensors
Pickthesensorand
whatyouwantto
measure
DataLoggingblockis
inthebluetab
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HowdoyouusetheDataLoggingBlock?
ì Tousethisblock,simplydragaDataLoggingBlockinfrontofthecode
youwanttologandturnit“on”.Tostoplogging,addanotherData
LoggingBlocksetto“off”.
ì Pickalltheotherparameters– theports,thesensorsyouwanttolog,
whatyouwanttorecord(rotations/degrees,etc.)
ì Downloadandrunprogram
On
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Off
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HowtoViewyourData
Ifyouwanttogetthefile 1
fromyourbricktothe
computer:
1) ClickontheBrick
InformationIcon
2) PresstheOpenBrowser
MemoryIcon.
3) Findthecorrect.rdf
file.
3
2
Ifyouwanttoviewthe
datafilefrom eitherthe
brickorthecomputer:
Toolsà Datalog File
Managerà SelectBRICK
orCOMPUTERandpick
thecorrectfile
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Challenge1:ComparingTurns
ì Makefourdifferentprogramsthatdoapivotturnandcompare
thedatafromtherotationsensor
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StepstoRemember
STEP1:IntheDataLoggingMyBlock,
selectthesensoryouarereading,the
portstheyarein.
STEP2:Selectthedurationandrate
STEP3:Remembertostopdatalogging
attheendofyourcode
STEP4:Remembertochangethename
ofthefileeachtimeotherwisetheywill
allbecalledMyData.
STEP5:Importyourdatafileand
comparethegraphs.Whichtypeof
pivotturnisthemostreliable?
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Challenge1Solution
Below,weranall4together, butyouwillfinditeasiertorun eachmethod separately
(becauseyoucanavoidadding motor resets)
InMethod 4,Motor
Cisdragged along.
Motor Bline
Method 4
Method 3
Motor Cline
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Method 1
Method 2
Methods 1and2are
verysimilar.
Method 3appearsto
bethemostreliable.
Youmaynot notice
muchdifferencein
reallife,butthedata
logshowsusthe
truereading.
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Credits
ì ThistutorialwaswrittenbySanjaySeshan andArvindSeshan
ì Morelessonsatwww.ev3lessons.com
This work is licensed under a Creative Commons AttributionNonCommercial-ShareAlike 4.0 International License.
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