[arm-allstar] DIY Open Board FOB Project

[Doug Crompton]

Kent,

  I cannot remember the last time I had a USB lockup with the FOB and I run
a lot of FOBS. It was probably several years ago before we fixed the
problem of removing and reinstalling the USB. It has been rock solid and no
reported problems. Usually these issue are power or ground loop related. If
you are having a problem I can almost guarantee it is not the FOB or the Pi


*73 Doug*

*WA3DSP*

*http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*


On Fri, Jul 7, 2017 at 3:37 PM, "Kent Ochs via arm-allstar" <
arm-allstar at hamvoip.org> wrote:

> Doug,
> Thank you for the instructions and photos.  The open board FOB certainly
> makes what was a somewhat difficult mod, easier.
> It is not a matter of if, but when you will experience a USB interface
> lock up.  It would be nice if someone could take this DIY project just one
> step further by showing how to integrate a 555 timer to monitor the
> heartbeat led and disconnect the PTT line if a lock up does occur.
>
> I certainly don't want to take any business away from the vendors who have
> already included this feature into their designs, but I'm guessing the
> people going the DIY route, probably would not be customers anyway.
>
> Kent OchsW9KAO
>
> Doug wrote:
>
> Date: Fri, 7 Jul 2017 09:57:47 -0400From: Doug Crompton <wa3dsp at gmail.com>
> To: ARM Allstar <arm-allstar at hamvoip.org>
> Subject: [arm-allstar] FOB Photos
> Message-ID:
>     <CAMp6vsv85+Tn59DU=K1yWLcuBGf93AZ_OmiT55Jn+WD3PGN_cQ at mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> Attached are examples of how to package the open board FOB. This shows
> using a DB25 wired to emulate a DMK/URI. The USB connections are wired
> directly to the board from a cut USB cable. The board is mounted on a sub
> board where all of the connections are made. The two wires to the CM108 in
> the second photo are fed under the row of pins from the right and tacked at
> the last pin on the left.
>
> I encourage you to make this a DIY project but the FOB shown here is being
> made and is available for purchase. I hesitated to make this public as it
> is more a service than a business and I don't want the producer to become
> inundated!
>
>
> *73 Doug*
>
> *WA3DSP*
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