[arm-allstar] USB FOB Mods

[Pierre Martel]

And at the same time it makes it compatible normal pc that dont have a gpio
strip.

Le mardi 2 août 2016, Doug Crompton via arm-allstar <arm-allstar at hamvoip.org>
a écrit :

> Simon,
>
>  No question is silly, well almost none, I do get a few.
>
> The way the external control will be done it will be possible to use the
> on board GPIO by writing a module to do it.  But there are a few reasons
> why that might not be a good idea. The Pi is 3V logic and you would have to
> make sure you did not exceed that. Also bringing leads from a far away
> external source to the Pi board could bring transients to the board. It
> could also lead to noise from the board getting into radio circuits.
> Another issue would be what GPIO pins do you use and how would that
> interfere with other devices possibly using them in a particular
> installation. There would be no standard that could be set for defined pins
> that would not have incompatibility in some situations.
>
> It would be up to the user to decide if these are issues for them but I
> personally feel a cleaner approach is to use a very inexpensive USB board
> such as the nano to supply gobs of I/O and not have to worry about any of
> the above issues.
>
>
>
> *73 DougWA3DSPhttp://www.crompton.com/hamradio
> <http://www.crompton.com/hamradio>*
>
>
> ------------------------------
> Date: Wed, 3 Aug 2016 13:24:52 +1200
> To: arm-allstar at hamvoip.org
> <javascript:_e(%7B%7D,'cvml','arm-allstar at hamvoip.org');>
> Subject: Re: [arm-allstar] USB FOB Mods
> From: arm-allstar at hamvoip.org
> <javascript:_e(%7B%7D,'cvml','arm-allstar at hamvoip.org');>
> CC: zl1oe.nz at gmail.com
> <javascript:_e(%7B%7D,'cvml','zl1oe.nz at gmail.com');>
>
> Hi Doug
> This is probably a silly question, but why can't we use GPIO for ptt/cos?
> Regards
> Simon ZL1OE
>
> On 2/08/2016 2:13 pm, "Doug Crompton via arm-allstar" <
> arm-allstar at hamvoip.org
> <javascript:_e(%7B%7D,'cvml','arm-allstar at hamvoip.org');>> wrote:
>
> I have changed the link for the sound FOB on the FOB Mod howto's. The old
> link was no longer valid. The new link shown should yield a good non potted
> FOB. While there are probably other links out there that are cheaper there
> is never any guarantee on any model that they are not potted but at least
> for now the one mentioned looks good. It uses a CM119A.
>
> We have been talking about this for awhile but Dave is hard at work on the
> code for using other means to read and write PTT, COS and other bits
> independent of the sound FOBS. This will allow unmodified FOBS to be used
> along with another source for I/O. This will make it out in beta code in
> the near future. Maybe not the next beta but if not soon after. One of the
> current methods being tested is the Arduino Nano which is a <=$3 board
> available from numerous sources. It plugs into a USB port and supplies many
> I/O bits. A two node (two sound FOBS and Nano) system could be built for
> less than $10 for the sound and control interfacing. This would also allow
> many additional bits for other uses. Compare that to over $150 if you were
> using DMK-URI's. It has long been a source of contention that a user can
> buy a complete processor for $30 and then have to spend twice or more for a
> rather simple radio interface. For many this should solve that problem.
>
>
>
> *73 DougWA3DSPhttp://www.crompton.com/hamradio
> <http://www.crompton.com/hamradio>*
>
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