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AnnouncementsDothefirstpageoftheworksheetwhileyouwait
PrepareyourcompleteddabblelabsafetytrainingtoshowtoDerrick
FirstReflectionduenextlecture
ProjectProposalandBOMduenextlecture
CircuitsWorksheetwillbeassignedthislabandduenextlecture
TurnineverythingbuttheCircuitsWorksheetinyourbinderENGR202:INTROTOENGINEERINGDESIGN 1
Binders1.Averagewas~15.5/202.MostCommonmistakeswere:
a. Forgettingtoincludetheparagraphdescribingthedecisionmatrix
b. Onlyonesentenceornotenoughdetailfortheprojectdescription.
c. Noonesigningteamcontracti. Creditwasonlytakenoffif1orlesspeoplehadsigned
3. CreditRedeeminga. Youcanreceiveupto50%ofthepointsyoumissfromadeliverableifyouturninacorrectbinderandwriteupdetailingwhatyoufixed
b. Wewillalsogiveextracreditforabinderthatgoesaboveandbeyonduptoourdiscretion.
4.Manyofyoumademistakeswedidn’tgradeoffforbutwillinthefutureiftheyarenotfixed,wewillgooverthemfromgrouptogroup
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CommonElectricalComponentsandCircuitsENGR202:INTRODUCTIONTOENGINEERINGDESIGNCOURSEUWCOLLEGEOFENGINEERING
ENGR202:INTROTOENGINEERINGDESIGN
Today’sAgenda1.Wearegoingtotalktoeachgroupabouttheirprojectandbindertogiveyoufeedback,ifwearen’ttalkingtoyoupleasestarttheworksheetthat’sbeenhandedout.
1.Wewillalternategoingthroughslidesandworkingontheworksheetuntil45- 60minutesbeforelectureends
1.WewillfinishlecturebygoingoverwhatgoesintotheBoMandprojectproposal,alongwithguidingyourgroupsthroughthosetwoassignments.
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LectureReview(1)Current:Therateofflowofelectronsbetweenpointsorthroughacircuit.CurrentisalwaysmeasuredinAmps.
Voltage:Theforcebackinganyelectricalcurrent,essentiallytheamountofforcebeingappliedtoelectrons.
Resistance:Howmuchacircuitorobjectwillresisttheflowofelectricalcurrent.MeasuredinOhm’s.
TheyareallrelatedbyOhm’slawV=IR.
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LectureReview(2)Everycircuitinserieshasthesamecurrentalongtheseries.Soweknowy=.5ANextwecanuseOhm’slawtosolveforxV=IRV=10I=.510=.5RR=20Inseriesthetotalresistanceisthesumofeachindividualresistor.R=(3+10+x) x=7Ω
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LectureReview(3)Thecircuitisinparallelwhichmeansthatthetotalresistanceisaninversesum:1/R(t)=1/R(1)+1/(R2)...etcAllwehavetodoispluginourresistancevaluesandwecanfindR1/R(t)=1/10+1/5+1/21/R(t)=8/10R(t)=10/8
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Breadboards1.Breadboardsallowyoutomakesimpleandcomplexcircuitsmuchmoreeasily
2.Metalbars(asseenontheright)connectthepinsbetweenthebreadboardwithminimalresistance.
3. Breadboardsareseparatedintotwosectionsoneachsidea. Farsidecolumnsconnectallthewayupanddownthebreadboard
b. Innerrowsconnectuptothecenterofthebreadboard
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Multi-meterAMulti-meterisanessentialtoolforelectricalengineers!
ThroughproperalignmentofthetwoprobesandcentraldialyoucanmeasureVoltage,Current,Resistance,andContinuityinbothDCandACcircuits.
ENGR202:INTROTOENGINEERINGDESIGN 9
VolmateDigitalLCDMulti-meter
ReadingVoltageorResistance1. Setthecentraldialtopointtowardsthecorrectvoltageorresistancesetting.
a. ForvoltageyouneedtoturntothesectiondistinguishedbytheDCsymbol
b. Nextselecttherightthreshold.Formostcasesinthisclassthatwillbe20Vandanywherefrom200-2000Ohms
2.Makesuretheprobesareconnectedtothecenterandleftholesonthemultimeter
3. Placeoneprobeonsideofthesectionofcircuitandoneprobeontheother
a. Donotbreakthecircuit 10
ReadingCurrent1. TurnthedialtowardsthecurrentsectionlabeledbyanAwiththeDCsymbolontherighta. 20- 200mAmostusedthreshold
2. Switchtheprobesintothelefttwosockets(orderwilldeterminethesignofyourvalue)
3. Alwaysroutethecircuitthroughthemultimetera. Calledbreakingthecircuit
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ReadingResistorsREADINGRESISTORCOLORBANDS EXAMPLERESISTOR:4BANDS
ENGR202:INTROTOENGINEERINGDESIGN 12
ResistorExample(1)Whatistheresistanceofthisresistor?
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1st Digit: Green represents the digit 5
2nd Digit: Blue represents the digit 6
Multiplier: Orange represents 10^3
Tolerance: Gold means +/- 5%
Resistance: 56000
LEDs1.Onedirectionalsemiconductors
2. Twopins:
a. Cathode(-)hasthelongestpin
b. Anode(+)
3. LEDsbreakiftheygetabove25mA,recommend
iscloserto18mA
4. Clearoneshave3pinsandcanchangecolor
a. usetheseifyouwantachallenge
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CombiningBatteriesINCREASINGTHEVOLTAGE:MOREPOWER INCREASINGCURRENTCAPACITY:LONGER
DURATION
Batteriescanbeplacedinparallel– positiveterminalsarejoinedtogether,asarenegativeterminal.
Thiswillincreasetheoperatingtime(mAh)
ENGR202:INTROTOENGINEERINGDESIGN 18
CircuitSwitchesMechanicalPushButtonSwitch- presstodivertcurrentbetweentwopinsorconnectthemSlideSwitch- slidesforcurrenttogotodifferentpinsToggleswitch- fliptoconnectordisconnectacircuitPressureswitch- connectsorredirectscurrentifpressureissensed
ElectricalRelays- essentiallyatoggleswitchactivatedifcurrentflowsthroughoneoftheirpinsTransistors- Wewon’tusetheseinthisclassbuttheybehavesimilarlytorelayswhenusedasaswitchSwitchSensors:sensorssuchasphoto,thermal,andpressurecanbesetuptoactasswitches
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DCMotors1.DC(directcurrent)motorsarethesimplestof
electricmotors.
a. EverymotorweuseinthisclasswillbeaDC
motor
2. Eachmotorhasapositiveleadandnegativelead.
3. Dependingwhichwaythecurrentisgoing
throughthemotorwillspindifferentdirection
4. Forgivenvoltage,amotorisdesignedtospinata
certainraterpm.ENGR202:INTROTOENGINEERINGDESIGN 21
3VDCMotor
KnowingyourdifferentDCmotors1.Brushed
a. Cheapestmotorb. bestforthisclass
2. Brushlessa. Moreefficientandlongerlastingthanbrushed
i. Alsooftenspinsatafasterrpmb. Canbeexpensive
3. Steppera. Brushlessmotorthatspinsinsections(steps)b. Highdegreeofcontrolandtorque.c. Mostexpensive
4. Servoa. Precisecontroloverangularpositionallowsforthebestcontrol
b. Cheapforhightorque,slowrpm
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MotorSpecs:Howtopickthebestmotor1.Youhavetobeverycarefulwhenchoosingyourmotors,theyverygreatlyfromtypetotype.
2. Considerthefollowingspecificationsforyourmotors
a. Type
b. RPM
c. Torque
d. Size
e. Nominalvoltage
f. Stallcurrent
g. Tolerance
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Arduino1.Eachteamgets1arduinouno
a. Donotbreakyours2. AnArduinoisamicrocontroller,don’tconfuseitwithastandardcomputer
3. YourArduinohasacombinedmemoryof35kB,almostallofthatgoestoyourcodeandoperations
4.Usedtooperatecomponents,performcalculations,andreadvaluesfromsensors
5. RunsfromcodeinArduino,similartoClanguages.
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H-Bridge1.Amotorcontroller- nocomputingpower
2. Controlsthevoltageoutputandsignfromitstwooutputportsa. Let’syoucontrolspeedand
directionforyourmotors3. Alsocanactasapowersourcetoyourothercomponents
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IntroductiontosensorsWhenyouarelookingatsensorsforyourprojectsyoushouldconsiderthefollowingquestions:
Whatisactuallybeingsensed?(wheredoesitsvaluescomefrom)
HowdoIreadthosevalues?(signaltype,datatrends..etc)
Isitreliableenoughformysituation?(accuracy,precision,sensingtime...etc)
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DistancesensorsMainlyultrasonicorinfrareddistancesensorsareusedinthisclass1.UltrasonicSensors:sensorsthatsendsoutasoundpulseandmeasurethetimeittakestocomebacka. Longermeasuringtimeb. VeryCheapc. Measureinawideranged. Digital
2. InfraredSensors:Sendsoutawaveofinfraredlightandmeasuresthetimeittakestoreturna. Cheap,butnotascheapasultrasonicsb. Fastmeasuringtimec. Analogd. Verypreciserange
3.Honorablemention:LIDAR
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PositionandOrientation1.Accelerometer- measuresaccelerationandsometimesorientationandtilt
a. Usefulforderivingrelativepositionandvelocity2.GPS(GeographicalPositionSensor)
a. Usefulforknowinglocation,speed,andorientationb. Oftenexpensiveandatthemostaccuratetoafewmeters
3.Gyroscopea. Usefulforfiguringoutorientationandtilt
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Datastorage&transmissionArduino’sthemselvescan’treallystoredatasowhatdoyoudowithit?
Theanswerisyouhavetoeitherfindanothercomponenttostoreyourdata,oryouhavetosenditsomewhere.
1. Storingdata:SDcardshieldforarduinoa. Thebestwaytostoredatawithyourarduino’sistouseanSDcard.ForthatyouneedtogetsomethingcalledanSDcardshield.
2. Sendingdata:a. Bluetooth:usuallytheeasiestoptionhoweveritcanberangelimited.Alsodoesnotsendvideo
b. Wifiorethernet:reliesonhavingawifisourcec. RadioFrequency:Canbedifficulttoworkwithorslowtotransmit.Longrange
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ProjectProposalThelastassignmentwasmisleading- noneofyourprojectidea’sarefinalizedTogetfinalizedyouneedtogetapprovalfromtheTA’sTheproposalisyourwayofsellingyourprojectideatous,andalsoyourbestwaytoselltheimportanceofyourproject.Wecan,andwill,rejectyourproposalifyoudon’tdoagoodenoughjob.
(Wewon’ttakeoffcreditinthelongrunforrejectedproposals)Alloftheinformationyouneeddetailingtheproposalwillbeuploadedtothecoursewebsitetonight.
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BillofMaterials1.Nextlectureyouneedtosubmitalistofallofthematerialsyoupredictthatyouwillneedtouse.Includepricesa. ThisshouldincludePLA(1000gfor$20)b. Anywoodforlasercutting(seederrickforprices)c. Allelectricalcomponentsd. Anythingelsegoingintotheproject
2. Forpricingrunoffthecheapestdealyoucangetonline- evenforpartsweprovidea. Wholesaledealsfromforeigncountriesdonotcount
3. Formatthisinaspreadsheetwiththenameofthepart,quantity,totalcost,andlinkfromwhereitcanbeordered(orstoreyoubuyitfrom)
4. Thislistcanberoughandyouareallowedtochangeit,howeverforelectricalpartswewillorderoffofthislistsofocusonthosethemost
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FortherestofthelectureGoalbytheendofthelectureistomakesureeveryoneknowsforsuretheirprojectidea
Youcanchangeprojectideasaftertheproposalhoweveritwillcostyoualotoftime
Helpingyouallfigureoutwhatpartsyouneed,understandingwhatyouactuallyneedandwhatdifferentcomponentsofferisdifficult.
WewillbefocusingmostlyonhelpingyouallgetyourBoMgoingstrong
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