[arm-allstar] USB FOB Mods

Simon Keys zl1oe.nz at gmail.com
Tue Aug 2 20:24:52 EST 2016

Hi Doug
This is probably a silly question, but why can't we use GPIO for ptt/cos?
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 link was no longer valid.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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