On Fri, Sep 29, 2017 at 10:32 AM Robert Nelson <[email protected]> wrote:
> On Fri, Sep 29, 2017 at 7:05 AM, Giulio Moro <[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, these > > https://www.mouser.co.uk/ProductDetail/Gravitech/20Mx2-254mm or sockets > like > > these sockets > 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. * Add-on daughterboards should tend to use male headers on the bottom, exposing the silkscreen on PocketBeagle's bottom for easy probing. 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. * 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. 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/ > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/CAOCHtYg6-P4%3Dq-Db%3DT4nOhKVCGqt0FwJ5yPQVWTvazZNmn13oA%40mail.gmail.com > . > For more options, visit https://groups.google.com/d/optout. > -- https://beagleboard.org/about -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CA%2BT6QPkXLk4Q05h9amGyA_sz2vH6Zec%2BTv3d8k5g4QP1Axj7JA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
