> Am 29.09.2017 um 17:19 schrieb Jason Kridner <[email protected]>:
>
>
>
> On Fri, Sep 29, 2017 at 10:32 AM Robert Nelson <[email protected]
> <mailto:[email protected]>> wrote:
> On Fri, Sep 29, 2017 at 7:05 AM, Giulio Moro <[email protected]
> <mailto:[email protected]>> wrote:
> > I got myself a PocketBeagle and I realized that I cannot fit headers on the
> > CPU components side because there is not enough clearance between the pads
> > and the Octavo chip for the plastic of the header to fit in. I am using
> > headers like these https://www.adafruit.com/product/2076
> > <https://www.adafruit.com/product/2076>, these
> > https://www.mouser.co.uk/ProductDetail/Gravitech/20Mx2-254mm
> > <https://www.mouser.co.uk/ProductDetail/Gravitech/20Mx2-254mm> or sockets
> > like
> > these sockets https://www.mouser.co.uk/ProductDetail/Gravitech/4Fx2-254mm/
> > <https://www.mouser.co.uk/ProductDetail/Gravitech/4Fx2-254mm/>
> > None of these would fit.
> >
> > The alternative would be to place the sockets on the bottom side and put the
> > solder on the components side, but it does not seem a great option. Are
> > there any sockets/headers that you use that fit on the components side?
>
> I've gotten both dual row and single row female headers to fit..
>
> The secret, use a "CLICK" board to help keep it aligned..
>
> Single row push hard enough and it'll fit around the Octavo
>
> Dual Row, they'll be a gap, but enough room to solder:
>
> See the pictures as an example:
>
> BTW, we are looking at creating an add-on specification. Feedback from the
> community is critical.
>
> Yes, indeed, we know the fit around the Octavo SIP is tight for shrouded
> connectors. This was to enable use of mikroBUS Click boards (two of them).
> Robert has shown how it is indeed possible.
>
> Some conventions it seems we should encourage such that people making add-on
> daughterboards do them consistently. Feedback requested here.
>
> * Always put female headers on top and male headers on bottom.
> * Pass-through headers are fine.
> * If populating for a breadboard, try to use the outer rows and use only
> one-side per board (don't try to span or you won't have a place to put your
> wires where you can see them.
That is the reason why we thinned out the number of pins to a single row on our
Letux Cortex 8 OSD3358 board.
> * Add-on daughterboards should tend to use male headers on the bottom,
> exposing the silkscreen on PocketBeagle's bottom for easy probing.
Sounds very reasonable.
The only downside I see is that you can't press the reset button or see the
LEDs.
>
> These are just some thoughts from someone who has been prototyping with the
> boards for a couple of weeks. The point is to provide feedback. Please chime
> in on each point feel free to "pile-on" in the feedback. It can be annoying
> for some people not interested, but should be OK if we keep it to ONE THREAD.
>
> Some concerns about my thoughts, right off the bat.
> * Using the silkscreen is difficult if you keep the board upright, so putting
> male headers on bottom makes prototyping on a breadboard difficult.
> * Having male headers on bottom could easily result in shorts when setting
> the board down.
well, female on top still have metal pins standing out of the bottom side, but
it might be easier to protect.
> * Ribbon cables and the Pi-style breakouts to breadboards could work if male
> headers were put on top.
> * Any headers on the bottom will make fitting in the Altoids Smalls mint tin
> more difficult.
> * Breadboarding often is useful for SPI/I2C/UART devices or 5V/3.3V output
> not available on the outer rows by default.
>
> Some alternate thoughts that support my initial position.
> * The headers are positioned to work with Click boards on *top*. This is
> something I might have changed if we did it over, but my sensibilities tell
> me the components should be top-side on all boards.
> * If breadboarding, you can always use female headers on top, as suggested,
> and use male-pins to act as an interposer, flipping the board and selectively
> placing those male pins on either the inner or outer row. To that end, I
> might suggest never soldering male headers on the bottom at all, but I can
> imagine many cases where that is desirable.
Female headers on top is also the default of the BeagleBone. So it has become
sort of "Beagle"-standard...
So it seems to be quite "natural" to me.
I have thinned out the EAGLE files so that only the board dimensions and the
contact pads and the silk screen (so that a daughterboard can have the same
bottom print - but uses male headers):
https://www.goldelico.com/downloads/PocketBeagleCape.sch
https://www.goldelico.com/downloads/PocketBeagleCape.brd
Maybe you could publish an "official" blueprint like this somewhere and
recommend headers for PocketBeagle and a Cape.
BR,
Nikolaus Schaller
>
> OK, I had a lot more on my mind, but time for me to say
> less-about-me-and-more-about-you. Pile on! (Please use in-line comments to
> make the thread readable, rather than just throwing your comments on top.
>
>
> Regards,
>
> --
> Robert Nelson
> https://rcn-ee.com/ <https://rcn-ee.com/>
>
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