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<div class="moz-cite-prefix">You are missing something.... On most
FOB's, regardless of the manufacturer, the RED LED is not wired to
pin 13. While the green LED usually works correctly because it's
tied to pin 12 on the C-Media chip, the red LED by default is
connected to pin 21.<br>
<br>
There are several reliable sources for non potted FOB's, but
generally they cost more. The SYBA UAUD71 and the StarTech
ICUSBAUDIO are two such units. They generally cost between $11
and $17 depending on supplier.<br>
<br>
I've recently dropped the price of the RA-35 to include the CM119A
and EEPROM to be presoldered.<br>
<a class="moz-txt-link-freetext" href="http://www.masterscommunications.com/products/radio-adapter/ra35.html">http://www.masterscommunications.com/products/radio-adapter/ra35.html</a><br>
<br>
Kevin<br>
<br>
<br>
<br>
On 11/24/2016 3:20 PM, <a class="moz-txt-link-abbreviated" href="mailto:no1pc@yahoo.com">no1pc@yahoo.com</a> wrote:<br>
</div>
<blockquote cite="mid:1366750168.50372.1480018830272@mail.yahoo.com"
type="cite">
<div style="color:#000; background-color:#fff;
font-family:Helvetica Neue, Helvetica, Arial, Lucida Grande,
sans-serif;font-size:16px">
<div id="yui_3_16_0_1_1479964511744_47940"><br
id="yui_3_16_0_1_1479964511744_47941">
</div>
<div id="yui_3_16_0_1_1479964511744_47942">I have a few USB fobs
resembling the one shown in the document titled "USB FOB to
DB25 Interface" </div>
<div id="yui_3_16_0_1_1479964511744_47943"><br
id="yui_3_16_0_1_1479964511744_47944">
</div>
<div id="yui_3_16_0_1_1479964511744_47945">Unfortunately the
chip itself is potted die-on-board so access to signalling
lines is limited to the additional components on board, which
should seem simple enough to get to Pin 13 that feeds the Red
LED to extract a PTT signal.</div>
<div id="yui_3_16_0_1_1479964511744_47946"><br
id="yui_3_16_0_1_1479964511744_47947">
</div>
<div id="yui_3_16_0_1_1479964511744_47948">(I am able to assert
COS- to Volume down and get received audio "to the net"
experienced with WebTransceiver.)</div>
<div id="yui_3_16_0_1_1479964511744_47949"><br
id="yui_3_16_0_1_1479964511744_47950">
</div>
<div id="yui_3_16_0_1_1479964511744_47951">Unfortunately
metering 'every' available connection and toggling
WebTransceiver's Key/Transmit, none of the signal lines on the
board react. I could imagine one line or the other might be
open-collector and I'd have to add a pull-up to see a
transition, but with the LED still in-circuit I'd think that
would react. (The Green LED works as heartbeat just fine.)</div>
<div id="yui_3_16_0_1_1479964511744_47952"><br
id="yui_3_16_0_1_1479964511744_47953">
</div>
<div id="yui_3_16_0_1_1479964511744_47954">Before I head to the
local Frys and buy 1-2 each every fob they have to gut to see
if I could get to the chip pins directly (or try to be patient
and wait for Amazon)...</div>
<div id="yui_3_16_0_1_1479964511744_47955"><br
id="yui_3_16_0_1_1479964511744_47956">
</div>
<div id="yui_3_16_0_1_1479964511744_47957">... I'm sitting here
looking at a fully functional micro with a LOT of GPIO pins
available... wondering why, aside from the IRLP s/w and
interface options available... doesn't an AllStar
implementation leverage the on-board signalling?</div>
<div id="yui_3_16_0_1_1479964511744_47958"><br
id="yui_3_16_0_1_1479964511744_47959">
</div>
<div id="yui_3_16_0_1_1479964511744_47960">I see there is Python
code around to work with the GPIO, but not quite yet sure how
or if I could create and call PTT and COR (and CTCSS) sense
scripts within the AllStar configuration - ???</div>
<div id="yui_3_16_0_1_1479964511744_47961"><br
id="yui_3_16_0_1_1479964511744_47962">
</div>
<div id="yui_3_16_0_1_1479964511744_47963">I know it would split
out the radio audio v PTT/COS wiring harness just a bit vs the
cute USB thing, but what the heck - buffer/interface parts on
a small perf board tied to the GPIO pins and done? No?</div>
<div id="yui_3_16_0_1_1479964511744_47964"><br
id="yui_3_16_0_1_1479964511744_47965">
</div>
<div id="yui_3_16_0_1_1479964511744_47966">Am I missing
something? Code- and instructions-to-be?</div>
<div id="yui_3_16_0_1_1479964511744_47967"><br
id="yui_3_16_0_1_1479964511744_47968">
</div>
<div id="yui_3_16_0_1_1479964511744_47969">Using Pi 3 Model B v
1.2</div>
<div id="yui_3_16_0_1_1479964511744_47970"><br
id="yui_3_16_0_1_1479964511744_47971">
</div>
<div dir="ltr" id="yui_3_16_0_1_1479964511744_47972">BTW, uname
-a yields: "Linux barf3 3.18.0-trunk-rpi2 #1 SMP PREEMPT
Debian 3.18.5-1~exp1.co1 (2015-02-02) armv7l GNU/Linux"</div>
</div>
<br>
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