[arm-allstar] USB FOB Mods

David Lang david at lang.hm
Tue Aug 2 21:18:10 EST 2016

Because the old code was written to assume that it was using a GPIO on the sound 

The new code that he's talking about separates this out so that we could use a 
normal GPIO.

David Lang

On Wed, 3 Aug 2016, Simon Keys via arm-allstar wrote:

> 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> 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 link was no longer valid.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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