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16. Ifyouwouldliketoaddmoretrackwidthsgoto: DesignRulesDesignRulesGlobalDesignRules
tabandatthebottomrightofthiswindowaddanyotherwidthyouwouldliketohaveavailable. Youcanthen
choosethewidthsofthetrackfromthedrop-downmenuwhileyoulayoutyourboard. Seetheexamplebelow
(inches).
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17. Alternatively,youcanaddaNetClassinwhichyouspecifyasetofoptions. . GotoDesignRulesDesign
RulesNetClassesEditorandaddanewclasscalledpower.Changethetrackwidthfrom8mil(indicated
as0.0080)to24mil(indicatedas0.0240). Next,addeverythingbutgroundtothepowerclass(selectdefaultat
leftandpoweratrightandusethearrows).
18. Ifyouwant t tochangethegridsize,Rightclick→ GridSelect. Besuretoselecttheappropriategridsize
beforeorafterlayingdownthecomponentsandconnectingthemtogetherwithtracks.
19. Repeatthisprocessuntilallwires,exceptpin3ofJ1,areconnected. Yourboardshouldlookliketheexample
below.
20. Let’s s nowrunatrackontheothercoppersideofthePCB.SelectB.Cuinthedrop-downmenuonthetop
toolbar.ClickontheAddtracksandviasicon
. Drawatrackbetweenpin3ofJ1andpin8ofU1. This
isactuallynotnecessarysincewecoulddothiswiththegroundplane. Noticehowthecolourofthetrackhas
changed.
21. GofrompinAtopinBbychanginglayer.Itispossibletochangethecopperplanewhileyouarerunning
atrackbyplacingavia. Whileyouarerunningatrackontheuppercopperplane,rightclickandselectPlace
Viaorsimplypressthevkey.Thiswilltakeyoutothebottomlayerwhereyoucancompleteyourtrack.
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22. Whenyouwanttoinspect t aparticularconnectionyoucanclick ontheNethighlighticon
ontheright
toolbar.Clickonpin3ofJ1. Thetrackitselfandallpadsconnectedtoitshouldbecomehighlighted.
23. NowwewillmakeagroundplanethatwillbeconnectedtoallGNDpins. ClickontheAddZonesicon
ontherighttoolbar. Wearegoingtotracearectanglearoundtheboard,soclickwhereyouwantoneofthe
cornerstobe. Inthedialoguethatappears,setPadinZonetoThermalrelief andZone edgesorienttoH,V
andclickOK.
24. Tracearoundtheoutlineoftheboardbyclickingeachcornerinrotation. . Double-clicktofinishyourrectangle.
Rightclickinsidetheareayouhavejusttraced. ClickonFillorRefillAllZones. Theboardshouldfillinwith
greenandlooksomethinglikethis:
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25. Runthedesignrules s checker byclickingonthe Perform Design RulesCheck icon
onthe toptoolbar.
ClickonStartDRC.Thereshouldbenoerrors. ClickonListUnconnected. Thereshouldbenounconnected
track. ClickOKtoclosetheDRCControldialogue.
26. SaveyourfilebyclickingonFileSave. Toadmireyourboardin3D,clickonView3DViewer.
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27. YoucandragyourmousearoundtorotatethePCB.
28. Yourboardiscomplete. . TosenditofftoamanufactureryouwillneedtogenerateallGerberfiles.
4.2 GenerateGerberfiles
Once your PCB is s complete, , you u can generate e Gerber files s for eachlayer r and d send them to your favourite e PCB
manufacturer,whowillmaketheboardforyou.
1. FromKiCad,openthePcbnewsoftwaretoolandloadyourboardfilebyclickingontheicon
.
2. ClickonFilePlot. SelectGerber asthePlotFormatandselectthefolderinwhichtoputallGerberfiles.
ProceedbyclickingonthePlotbutton.
3. Thesearethelayersyouneedtoselectformakingatypical2-layerPCB:
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Layer
KiCadLayer
Name
OldKiCadLayer
Name
DefaultGerber
Extension
”UseProtel
filename
extensions”is
enabled
BottomLayer
B.Cu
Copper
.GBR
.GBL
TopLayer
F.Cu
Component
.GBR
.GTL
TopOverlay
F.SilkS
SilkS_Cmp
.GBR
.GTO
BottomSolder
Resist
B.Mask
Mask_Cop
.GBR
.GBS
TopSolderResist
F.Mask
Mask_Cmp
.GBR
.GTS
Edges
Edge.Cuts
Edges_Pcb
.GBR
.GM1
4.3 UsingGerbView
1. ToviewallyourGerberfilesgototheKiCadprojectmanagerandclickontheGerbViewicon.Onthedrop-down
menuselectLayer1.ClickonFileLoadGerberfileorclickontheicon
.LoadallgeneratedGerber
filesoneatatime.Notehowtheyallgetdisplayedoneontopoftheother.
2. Usethemenuontherighttoselect/deselectwhichlayertoshow. Carefullyinspecteachlayer r beforesending
themforproduction.
3. Togeneratethedrillfile,fromPcbnewgoagaintotheFilePlotoption.Defaultsettingsshouldbefine.
4.4 AutomaticallyroutewithFreeRouter
Routingaboardby handis quickand d fun, however, for r a a boardwithlots s of components you u might t want touse
anautorouter. Remember r thatyoushouldfirst routecriticaltracesbyhandandthenset theautorouter todothe
boringbits. Itsworkwillonlyaccountfortheunroutedtraces. TheautorouterwewillusehereisFreeRouterfrom
freerouting.net.
Note
Freerouterisanopensourcejavaapplication,anditisneededtobuildbyyourselftousewithKiCad. Sourcecodeof
Freeroutercanbefoundonthissite:https://github.com/nikropht/FreeRouting
1. From Pcbnew click on File → → Export → Specctra DSN or clickonTools → FreeRoute → Export a
SpecctraDesign(*.dsn) fileandsavethefilelocally. LaunchFreeRouterandclickontheOpenYourOwn
Designbutton,browseforthedsnfileandloadit.
Note
TheToolsFreeRoutedialoghasanicehelpbuttonthatopensafileviewerwithalittledocumentinsidenamed
FreerouterGuidelines. PleasefollowtheseguidelinestouseFreeRouteeffectively.
2. FreeRouterhassomefeaturesthatKiCaddoesnotcurrentlyhave,bothformanualroutingandforautomatic
routing.FreeRouteroperatesintwomainsteps:first,routingtheboardandthenoptimisingit.Fulloptimisation
cantakealongtime,howeveryoucanstopitatanytimeneedbe.
3. YoucanstarttheautomaticroutingbyclickingontheAutorouterbuttononthetopbar.Thebottombargives
youinformationabouttheon-goingroutingprocess. IfthePasscountgetsabove30,yourboardprobablycan
notbeautoroutedwiththisrouter.Spreadyourcomponentsoutmoreorrotatethembetterandtryagain.The
goalinrotationandpositionofpartsistolowerthenumberofcrossedairlinesintheratsnest.
4. Makingaleft-clickonthemousecanstoptheautomaticroutingandautomaticallystarttheoptimisationprocess.
Anotherleft-clickwillstoptheoptimisationprocess. Unlessyoureallyneedtostop,itisbettertoletFreeRouter
finishitsjob.
5. ClickontheFileExportSpecctraSessionFilemenuandsavetheboardfilewiththe.sesextension.You
donotreallyneedtosavetheFreeRouterrulesfile.
6. BacktoPcbnew. YoucanimportyourfreshlyroutedboardbyclickingonthelinkToolsFreeRouteand
thenontheiconBackImporttheSpectraSession(.ses)Fileandselectingyour.sesfile.
If thereisanyroutedtracethat youdonotlike,youcandeleteitandre-routeit again,usingthedelkeyandthe
routingtool,whichistheAddtracksicon
ontherighttoolbar.
Chapter5
ForwardannotationinKiCad
Once youhavecompletedyour electronicschematic, the footprintassignment, the boardlayout andgeneratedthe
Gerberfiles,youarereadytosendeverythingtoaPCBmanufacturersothatyourboardcanbecomereality.
Often,thislinearwork-flowturnsouttobenotsouni-directional. Forinstance,whenyouhavetomodify/extenda
boardforwhichyouorothershavealreadycompletedthiswork-flow,itispossiblethatyouneedtomovecomponents
around,replacethemwithothers,changefootprintsandmuchmore. Duringthismodificationprocess,whatyoudo
notwanttodoistore-routethewholeboardagainfromscratch.Instead,thisishowyoudoit:
1. Let’ssupposethatyouwanttoreplaceahypotheticalconnectorCON1withCON2.
2. YoualreadyhaveacompletedschematicandafullyroutedPCB.
3. FromKiCad,startEeschema,makeyourmodificationsbydeletingCON1andaddingCON2.Saveyourschematic
projectwiththeicon
andclickontheNetlistgenerationicon
onthetoptoolbar.
4. ClickonNetlistthenonsave. Savetothedefaultfilename. Youhavetorewritetheoldone.
5. NowassignafootprinttoCON2. ClickontheRunCvpcbicon
onthetoptoolbar. Assignthefootprint
tothenewdeviceCON2. Therestofthecomponentsstillhavethepreviousfootprintsassignedtothem. Close
Cvpcb.
6. Backintheschematiceditor,savetheprojectbyclickingonFileSaveWholeSchematicProject. Closethe
schematiceditor.
7. FromtheKiCadprojectmanager,clickonthePcbnewicon. . ThePcbnewwindowwillopen.
8. Theold,alreadyrouted,boardshouldautomaticallyopen.Let’simportthenewnetlistfile. . ClickontheRead
Netlisticon
onthetoptoolbar.
9. ClickontheBrowseNetlistFilesbutton,selectthenetlistfileinthefileselectiondialogue,andclickonRead
CurrentNetlist. ThenclicktheClosebutton.
10. Atthispointyoushouldbeabletoseealayoutwithallpreviouscomponents s alreadyrouted. . Onthetopleft
corneryoushouldseeallunroutedcomponents,inourcasetheCON2. SelectCON2withthemouse.Movethe
componenttothemiddleoftheboard.
11. PlaceCON2androuteit.Oncedone,saveandproceedwiththeGerberfilegenerationasusual.
The process s described here can easily y be repeated d as many y times s as you need. . Beside e the Forward Annotation
methoddescribedabove,thereisanothermethodknownasBackwardAnnotation. Thismethodallowsyoutomake
modificationstoyouralreadyroutedPCBfromPcbnewandupdatesthosemodificationsinyourschematicandnetlist
file.TheBackwardAnnotationmethod,however,isnotthatusefulandisthereforenotdescribedhere.
Chapter6
MakeschematiccomponentsinKiCad
SometimesacomponentthatyouwanttoplaceonyourschematicisnotinaKiCadlibrary. Thisisquitenormaland
thereisnoreasontoworry. Inthissectionwewillseehowanewschematiccomponentcanbequicklycreatedwith
KiCad. Nevertheless,rememberthatyoucanalwaysfindKiCadcomponentsontheInternet. Forinstancefromhere:
http://per.launay.free.fr/kicad/kicad_php/composant.php
InKiCad,acomponentisapieceoftextthatstartswithaDEFandendswithENDDEF.Oneormorecomponents
arenormallyplacedinalibraryfilewiththeextension.lib. Ifyouwanttoaddcomponentstoalibraryfileyoucan
justusethecutandpastecommands.
6.1 UsingComponentLibraryEditor
1. WecanusetheComponentLibraryEditor (partofEeschema)tomakenewcomponents. . Inourprojectfolder
tutorial1let’screateafoldernamedlibrary.InsidewewillputournewlibraryfilemyLib.libassoonaswehave
createdournewcomponent.
2. Nowwecanstartcreatingournewcomponent. . FromKiCad,startEeschema,clickontheLibraryEditoricon
andthenclickontheNewcomponenticon
.TheComponentPropertieswindowwillappear.Name
thenewcomponentMYCONN3,settheDefaultreferencedesignatorasJ,andtheNumberofpartsperpackage
as 1. ClickOK.Ifthewarningappearsjustclickyes. . Atthispointthecomponentisonlymadeofitslabels.
Let’saddsomepins.ClickontheAddPinsicon
ontherighttoolbar.Toplacethepin,leftclickinthe
centreoftheparteditorsheetjustbelowtheMYCONN3label.
3. InthePinPropertieswindowthatappears,setthepinnametoVCC,setthepinnumberto1,andtheElectrical
typetoPassivethenclickOK.
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