OK, thanks for the references, I'll (try to) re-design it including a local Xtal. I'll keep solder jumpers, as it may be interesting to use internal clock with low speed (low consumption).
Cheers, Seb 2010/8/6 vasile surducan <[email protected]> > 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. > 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]. For more options, visit this group at http://groups.google.com/group/jallib?hl=en.
