I like this one! Vasi
On Sep 10, 9:39 pm, Sebastien Lelong <[email protected]> wrote: > This one might be better, there's no bridge except two for connecting large > areas of GND signals (I don't know if this is much useful...) > > Seb > -- > Sébastien Lelonghttp://www.sirloon.nethttp://sirbot.org > > 2009/9/10 vasile surducan <[email protected]> > > > Hi Seb, > > > I am appreciating your enthusiasm, however the shield you've designed it > > hasn't too much ability of shielding. > > > If your need carrying PWM signals from one board to other, where both or > > only one board has also analogic areas, you must be very carefull. You need > > two layers and ground planes on both layers connected through a number of > > vias. > > > If your application is pure digital, both boards without any analogic area, > > then shielding is not important. > > > If the PWM is used for generating a clean analogic signal after a > > filter, could be a serious problem (clean PWM filtering with first order > > filters is impossible, no matter what you have seen on the enthusiastics > > websites; clean means lower than 5mV ripple). > > > Learn to avoid in your design 90 degree direction changes in your routes as > > a general rule. If you have two layers, use traces equaly on both > > layers. Avoid multiple layer changes on clocks, PWMs and other agressing > > signals. Designing a PCB it's like programming. You can't do it well if you > > don't do it continously...Biggest problems start on 8-12 layers, but two > > layers an a PIC it's a good start. > > > On 9/10/09, Sebastien Lelong <[email protected]> wrote: > > >> Hi guys, > > >> I've committed Jaluino PCB & schematic template for Eagle (see > >>http://code.google.com/p/jallib/source/browse/trunk/project/jaluino/s...). > >> From this, I tried to create a shield that could act as a layer, an > >> intermediate, between Jaluino shields and Arduino shields. The idea is to > >> plug this intermediate shield onto Jaluino board, then plug an original > >> Arduino shield on top of this. > > >> Attached are pictures of: > > >> - schematic: with mapping between Jaluino & Arduino pins. For PWM > >> channels, one is taken from RC2/CCP1, another is taken either from RC1/CCP2 > >> or RB3/CCP2. RC1 and RB3 are multiplexed, so you can choose which of these > >> two pins will carry PWM. Using this approach, it may increase compatibility > >> (still only 2 PWM channels will be available, but for one, you can choose > >> where). As for analog pins, RA3/AN3 is mapped with AREF. Other mappings are > >> quite explicit. I'm open to suggestions ! > > >> - PCB: the resulting PCB. Green aeras are considered as blue tracks (but > >> couldn't make them blue...). Quite a lot of vias, not that beautiful, > >> sorry... > > >> Finally, I had a hard brainstorming (not just with myself this time), to > >> find a name for this shield: "Styx". So this is Jaluino "Styx" shield. Why > >> ? > >> Well... Well in Greek Mythology, Styx is the river between Earth and > >> Underworld, a clear frontier between two worlds. I hope this illustrates as > >> good as possible the main purpose of this shield. Defining which part is > >> Earth, which part is Underworld in our case is left to readers' objectivity > >> :) > > >>http://en.wikipedia.org/wiki/Styxfor more... > > >> [image: Dor%C3%A9_-_Styx.jpg] > > >> Cheers, > >> Seb > >> -- > >> Sébastien Lelong > >>http://www.sirloon.net > >>http://sirbot.org > > > > jaluino_shield_styx_pcb.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] For more options, visit this group at http://groups.google.com/group/jallib?hl=en -~----------~----~----~----~------~----~------~--~---
