[arm-allstar] HamVoIP I/O support - What is Best Current Practice for implementing I/O?

[Phil Visalli]

We did something similar using the GPIO pins on the DMK URI to steer thru 8
channels.

We first set the initial state of the GPIO pins in
/etc/asterisk/simpleusb.conf

gpio5=out0
gpio6=out0
gpio7=out0

Then just as Doug mentioned used DTMF tones to call a set of scripts, one
for each channel.  For example *801 might call a script called 'ch1.sh'
which would look something like this:

##########################################################
#!/bin/bash

/bin/asterisk -rvx "rpt cmd XXXXX cop 61 GPIO5=1,GPIO6=0,GPIO7=0"

/bin/asterisk -rvx "rpt localplay XXXXX /root/sounds/ch1"

exit 0
##########################################################

Where XXXXX is your node number.  I made sound files (using amazon
polly....good quality text to speech engine) that play and announce what
channel you just selected just so the user has confirmation of changing
channels.  Doug may have a more elegant or fancier version, but im pretty
sure that would work for you.

On Fri, Jan 12, 2018 at 3:10 AM, "Doug Crompton via arm-allstar" <
arm-allstar at hamvoip.org> wrote:

> Randy,
>
>   I have written a script to do exactly what you want to do using the Pi
> I/O. I will dig it up tomorrow and pass it on.
>
> Caveats - the pi is strictly 3V logic.  If the lines are TTL 5V logic then
> the best thing to do would be to use Schottky diodes on each line similar
> to how COS is done on the FOB. The Pi would pull the appropriate lines low
> but would not see the 5V from the radio. Really a rather simple hardware
> interface.
>
> The channel is passed to the script via calls from rpt.conf functions so
> DTMF would change the channel like -
>
> 1 - *801, 2 - *802, 3 - *803, etc.
>
>
> *73 Doug*
>
> *WA3DSP*
>
> *http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*
>
>
>
> On Fri, Jan 12, 2018 at 2:53 AM, "Randy Neals via arm-allstar" <
> arm-allstar at hamvoip.org> wrote:
>
> > Hi,
> >
> > What is the best current practice for implementing I/O on a Raspberry Pi
> to
> > control external things.
> > In this case, remote channel selection on a VHF remote base, a radio
> with 8
> > channels and having external control lines.
> >
> > From looking through the list archives, I see references to using an
> > Arduino Nano, and at an earlier time, using a USB I/O board from
> SparkFun,
> > and of course using the lines on the RPi itself.
> >
> > Anticipated questions...
> >
> > Q. What Am I trying To Do?
> > A. Control channel select lines on a VHF remote base station.
> >
> > Q. What format/How many lines?
> > A. 3 logic control lines. The lines are normally pulled up to +5V by the
> > radio.
> >      BCD format with the lines having binary weighting of 4, 2, and 1
> > respectively.
> >      High = weighted value / Low = zero value.
> >
> > Q. What audio interface will I use?
> > A. Simple USB, likely DMK URI. (But I could use a USB FOB, or other
> > interface if there is one with I/O)
> >
> > Thanks,
> > Randy
> > W3RWN
> > _______________________________________________
> >
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> > arm-allstar at hamvoip.org
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> >
> > Visit the BBB and RPi2/3 web page - http://hamvoip.org
> >
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