I think, if you don't need problems, use a local crystal + two capacitors and forgot the Atmel oscillator and other jumpers, solderless or not. See for references some Microchip application notes: AN826 AN849 AN943 AN949
On Fri, Aug 6, 2010 at 12:30 AM, Sebastien Lelong < [email protected]> wrote: > Hi Vasi(&le), > > Thanks, I forgot this ! Attached are top/bottom screenshots with GND pane. > You'll notice there's no more "orphan island" anymore, and autorouting while > 100% routed doesn't produce the weird traces I was talking about. > > PS: I did notice about long traces on OSC pins, I first removed them > (internal oscillator only) then re-added as I had some remaining space. > Maybe I could add on board Xtal + caps instead (but that's a lot of space), > with solder jumpers ? > > PPS: it wasn't that late after all :) > > Cheers, > Seb > > 2010/8/6 funlw65 <[email protected]> > > I'm tired now, but I think the entire copper pour is not GND. >> Sebastien, you need to click-right on the edge of your rectangle and >> choose "Name" from the menu and then rename it to GND.... >> If you did, then sorry, skip over - it is very late now... >> >> Vasi(funlw65) >> >> On Aug 6, 3:19 am, vasile surducan <[email protected]> wrote: >> > Because, Arduino like many others is a poor design. You have noticed >> well, >> > an orphan is asking for trouble. As the long routes (where any cm of >> route >> > means 0.5 to 0.7 pF parasitical capacitor) on the OSC pins with >> > discontinuities like jumpers. >> > Vasile >> > >> > On Thu, Aug 5, 2010 at 11:48 AM, funlw65 <[email protected]> wrote: >> > > No, it's ok, I saw also original Arduino design have orphans... >> > >> > > Vasi(funlw65) >> > >> > > On Aug 5, 6:03 pm, Sebastien Lelong <[email protected]> >> > > wrote: >> > > > Hi Vasi, >> > >> > > > 2010/8/5 funlw65 <[email protected]> >> > >> > > > > Hi Sebastien, >> > >> > > > > Good job, I like it very much. Is a nice addition to an Arduino >> board. >> > > > > You tried to see how it looks if you remove those orphan islands >> from >> > > > > the copper pour? >> > >> > > > What do you mean with these orphan islands ? Some copper is >> automatically >> > > > added by Eagle with Ratsness feature, this can explain those little >> piece >> > > of >> > > > copper. I may need to adjust ratsness parameters to remove them if >> this >> > > is a >> > > > problem. >> > >> > > > Cheers, >> > > > Seb >> > >> > > > > Vasi(funlw65) >> > >> > > > > On Aug 5, 3:56 pm, Sebastien Lelong <[email protected]> >> > > > > wrote: >> > > > > > Hi guys, >> > >> > > > > > I tried to design Cuckoo PCB, attached are Eagle files and >> screenshot >> > > for >> > > > > > bottom and top layers. Most traces are 16mil width, sometime >> 14mil to >> > > > > pass >> > > > > > between holes, and 5V/GND traces are 20mil. >> > >> > > > > > This is a double-sided PCB, aimed to be plugged upside down: >> bottom >> > > side, >> > > > > > where Cuckoo drawing is visible, is the one that can be viewed >> when >> > > > > plugged >> > > > > > on Arduino. PIC, and most components will be hidden by the >> board. In >> > > my >> > > > > > "reckoning" is correct, components should fit appropriately >> between >> > > > > Atmega >> > > > > > chipset, Xtal, push button and shield connectors. Maybe... >> > >> > > > > > Subsidiary question: in Eagle, I manually route traces, and >> added >> > > > > ratsness >> > > > > > rectangle. I wanted to check if no unrouted traces were >> remaining (I >> > > know >> > > > > > there weren't but...), and Eagle started to create new signals, >> with >> > > very >> > > > > > little traces and vias. There weren't connected to any existing >> > > signals, >> > > > > > it's as though it was to "cut" ratsness rectangle. I've removed >> them. >> > > > > Does >> > > > > > anyone know what's the purpose of such added traces/signals ? >> > >> > > > > > As reply to you, Sir Vasile Surducan: >> > >> > > > > > 2010/7/24 vasile surducan <[email protected]> >> > >> > > > > > > We had a looong discussion about ICSP some time ago, so this >> is the >> > > > > last >> > > > > > > time I'm opening again my mouth (by writting) about this >> subject. >> > > > > > > Put a 47nF... 100nF capacitor in parallel with your reset >> switch, >> > > in >> > > > > that >> > > > > > > way when turn ON the power supply, reset will be >> automatically, >> > > change >> > > > > R1 >> > > > > > > from 1k2 to 10k...33k and take out that diode. >> > > > > > > See for reference (only if consider those above) this one: >> > >> > >http://4.bp.blogspot.com/_0iJadzFlwNo/S_OgtycPtxI/AAAAAAAAAAc/vNesIW3. >> > > > > .. >> > >> > > > > > Due to lack of space, I've removed reset switch. About reset >> > > resistor, >> > > > > > Arduino already has one, 10K, connected from RESET /MCLR to +5V. >> If I >> > > had >> > > > > > added another resistor on Cuckoo board, both resistors would >> have >> > > been in >> > > > > > parallel, resulting in a "not so good value I guess". So, I've >> made >> > > > > cuckoo >> > > > > > reset resistor optional (for standalone usage, not connected to >> > > Arduino), >> > > > > > and let MCLR connected to Arduino reset circuitry (that is 10K). >> > >> > > > > > Diode was removed. >> > >> > > > > > > < >> > > > > >> http://4.bp.blogspot.com/_0iJadzFlwNo/S_OgtycPtxI/AAAAAAAAAAc/vNesIW3.. >> > > > > .>Switching >> > > > > > > the clock through a switch is a very bad idea. Very long >> routes of >> > > > > clock >> > > > > > > (incuding connectors in their path) is also a bad idea. >> > >> > > > > > Connecting to Arduino Xtal is now optional. By default, internal >> > > clock >> > > > > will >> > > > > > be recommanded (16MHz, same MIPS in the end). >> > >> > > > > > > If you want to start a merchantable new arduino, imagine the >> puzzle >> > > > > game >> > > > > > > (on a surface and not a startrek spatial puzzle) and imagine a >> > > complete >> > > > > > > jalluino-picolino (including "shields" ) in that way. Picolino >> = >> > > very >> > > > > small >> > >> > > > > > Sure, how do we proceed ? >> > >> > > > > > I think I'll try to build it with some cardboard, to check if >> all >> > > > > components >> > > > > > fit well. Then I plan to order PCBs from Seeedstudio prototyping >> > > > > service... >> > >> > > > > > Cheers, >> > > > > > Seb >> > >> > > > > > cuckoo_pcb_top.png >> > > > > > 360KViewDownload >> > >> > > > > > cuckoo_pcb_bottom.png >> > > > > > 367KViewDownload >> > >> > > > > > cuckoo.sch >> > > > > > 228KViewDownload >> > >> > > > > > cuckoo.brd >> > > > > > 66KViewDownload >> > >> > > > > > cuckoo_sch.png >> > > > > > 28KViewDownload >> > >> > > > > -- >> > > > > You received this message because you are subscribed to the Google >> > > Groups >> > > > > "jallib" group. >> > > > > To post to this group, send email to [email protected]. >> > > > > To unsubscribe from this group, send email to >> > > > > [email protected]<jallib%[email protected]> >> <jallib%[email protected]<jallib%[email protected]> >> > >> > > <jallib%[email protected]<jallib%[email protected]> >> <jallib%[email protected]<jallib%[email protected]> >> > >> > >> > > > > . >> > > > > For more options, visit this group at >> > > > >http://groups.google.com/group/jallib?hl=en. >> > >> > > > -- >> > > > Sébastien Lelonghttp://www.sirloon.nethttp://sirbot.org >> > >> > > -- >> > > You received this message because you are subscribed to the Google >> Groups >> > > "jallib" group. >> > > To post to this group, send email to [email protected]. >> > > To unsubscribe from this group, send email to >> > > [email protected]<jallib%[email protected]> >> <jallib%[email protected]<jallib%[email protected]> >> > >> > > . >> > > For more options, visit this group at >> > >http://groups.google.com/group/jallib?hl=en. >> >> -- >> You received this message because you are subscribed to the Google Groups >> "jallib" group. >> To post to this group, send email to [email protected]. >> To unsubscribe from this group, send email to >> [email protected]<jallib%[email protected]> >> . >> For more options, visit this group at >> http://groups.google.com/group/jallib?hl=en. >> >> > > > -- > Sébastien Lelong > http://www.sirloon.net > http://sirbot.org > > -- > You received this message because you are subscribed to the Google Groups > "jallib" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]<jallib%[email protected]> > . > > For more options, visit this group at > http://groups.google.com/group/jallib?hl=en. > -- You received this message because you are subscribed to the Google Groups "jallib" group. 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