[arm-allstar] A simplified USB FOB modification
Peter Kendall
g7rpg at hotmail.com
Thu Jun 25 11:16:02 EST 2015
Here is the code example to switch the pin to ground.
I've attached the two pi binaries, its wiringpi pin 0 btw.
you'll need to add the event in rpt.conf and then watch the pin and
you'll see it goes to ground on PTT.
you could always have that pin go high +3.3v by modifying the code.
#include <wiringPi.h>
#include <stdlib.h>
int main (void)
{
wiringPiSetup () ;
pinMode (0, OUTPUT) ;
{
digitalWrite (0, LOW) ;
}
exit (0) ;
}
On 25/06/2015 16:24, Sam Nabkey wrote:
>
> I would love to see your examples.
>
> Thanks very much
>
> S
>
> On Jun 25, 2015 10:39 AM, "Peter Kendall" <g7rpg at hotmail.com
> <mailto:g7rpg at hotmail.com>> wrote:
>
> I've made a quite a few micro nodes for friends, been using £1
> sound cards from eBay/China
>
> There is no soldering required to tiny surface mount parts.
>
> I use a gpio pin from the Pi to drive PTT directly on the BF888,
> this works ok for the low voltage sets, for 12v radios I use an
> opto coupler or mosfet (2n7000) to keep the pi gpio safe.
>
> COS (pull to ground) to the volume down button.
>
> PTT works using the events subsystem and a little program I wrote
> to pull the gpio pin (wiringPi 0) to ground.
>
> ;
> ; rpt.conf for Pi PTT
> [events]
> /usr/local/sbin/gp0on = s|t|RPT_TXKEYED
> /usr/local/sbin/gp0off = s|f|RPT_TXKEYED
> ;
> ;
>
> Have a look at my (cluttered) flickr site, some pics of the
> various builds.
>
> Blob fob with PTT (yellow) going to gpio pin of pi
>
> https://www.flickr.com/photos/127794264@N08/18126465794/in/datetaken-public/
>
> COS example
> https://www.flickr.com/photos/127794264@N08/17197162979/in/datetaken-public/
>
> Example node with 'blob fob' and pi PTT
> https://www.flickr.com/photos/127794264@N08/18458513778/in/datetaken-public/
>
> Hope this maybe of some use?
>
> If anyone is interested I can email the two little programs gp0on
> and gp0off.
>
> Peter
> G7RPG
> Node 41689
>
>
> On 25/06/2015 15:04, Doug Crompton wrote:
>> Jim,
>>
>> I understand the desire to try to put all the parts on the board
>> put that is often a recipe for disaster and so much harder for
>> most people. Absolutely minimizing what you do to the board is
>> the best approach. I have done it both ways and cutting things or
>> de-soldering things often leads to problems so when I realized
>> how easy it was to do it this way I wanted to share it.
>>
>> *73 Doug
>> WA3DSP
>> http://www.crompton.com/hamradio*
>>
>>
>> ------------------------------------------------------------------------
>> Date: Wed, 24 Jun 2015 23:39:30 -0700
>> From: jim.pilgram at gmail.com <mailto:jim.pilgram at gmail.com>
>> To: arm-allstar at hamvoip.org <mailto:arm-allstar at hamvoip.org>
>> Subject: Re: [arm-allstar] A simplified USB FOB modification
>>
>> I've had better luck on the switches using a nipper and just
>> simply cutting the 4 corners at the board. The less you have to
>> put the soldering iron on the board, the less chance of lifting a
>> trace. I also use the nippers to cut off all the jacks. All parts
>> go on the board and a 5 conductor cable is fed out one of the
>> jack holes in the case. I use super glue to weld the buttons on
>> the cover in place and reuse them. I've made about 25 of these
>> to date for myself and our group. We are using primarily CDM
>> series Motorola simplex nodes and I put them together including
>> the motorola 20 pin connector for about $16.50 total price. I
>> have them on 3 motorola MTR2000's and they work great.
>>
>> I don't think I'd personally want to make a career out of
>> building these but it was fun for a while and I only messed up 3
>> of them and that was the pin 13 wire connect. Once I started
>> putting hot melt glue on them, I quit breaking off the lead.Jim
>>
>>
>> Sent from my BlackBerry 10 smartphone on the Verizon Wireless 4G
>> LTE network.
>> *From: *Larry
>> *Sent: *Wednesday, June 24, 2015 20:32
>> *To: *ARM Allstar
>> *Reply To: *ARM Allstar
>> *Subject: *Re: [arm-allstar] A simplified USB FOB modification
>>
>>
>> Pictured in Doug's previous FOB article:
>>
>> If you are squeamish about connecting to the CM-108 chip there
>> really only needs to be a single wire added directly to the
>> CM-108 chip. That is PTT (pin 13). COS (pin 48) is accessible on
>> the left side (top or bottom solder joint) of SW1 (Vol DN). If
>> you want/need more room to solder a wire take a needle and press
>> it under each of the 4 corners of SW1 as you touch each corner
>> with a soldering iron. The switch will lift right off and you
>> will have the trace exposed under the left side of the button to
>> make your connection to pin 48.
>>
>> CTCSS detect (pin 39) is available on the right side of SW2 (Vol
>> UP). The same proceedure will work there if you want that signal.
>>
>> Larry - N7FM
>>
>>
>> On 06/24/2015 12:28 PM, Doug Crompton wrote:
>>
>> Well to answer your two points. The link on the site for the
>> FOB is not potted. It is the one shown in the photos. As far
>> as soldering is concerned there are only two potentially
>> tricky connections to the pins of the CM108 but as I pointed
>> out if you use the right size wire and tack it on it is not a
>> big deal. You might be surprised how easy it is. At $3 each
>> sacrifice one to experiment and maybe it won't even be a
>> sacrifice! The rest of the components you can mount or build
>> anyway you desire. It is shown in a DB25 shell but that is
>> certainly not a requirement. At first I was going to put a
>> little perf board in there but then realized that most of the
>> components could be mounted right of the connector.
>>
>> *73 Doug
>> WA3DSP
>> http://www.crompton.com/hamradio*
>>
>>
>> ------------------------------------------------------------------------
>> Date: Wed, 24 Jun 2015 11:44:16 -0600
>> From: mike at mtweb.net <mailto:mike at mtweb.net>
>> To: arm-allstar at hamvoip.org <mailto:arm-allstar at hamvoip.org>
>> Subject: Re: [arm-allstar] A simplified USB FOB modification
>>
>> On 6/24/2015 3:42 AM, Corey Dean wrote:
>>
>> One of the Main reasons I was looking for this in acid
>> and now the pi2 is due to the blob. Some of us ordered a
>> bunch just to find you could't get to the chip to modify it.
>>
>> Corey N3FE
>>
>> On Jun 24, 2015, at 2:11 AM, Doug Crompton
>> <doug at crompton.com <mailto:doug at crompton.com>> wrote:
>>
>> I often get requests for GPIO control of COS and PTT
>> on the BBB and RPi2. While we are going to have that
>> capability in the next release at least for the RPi2
>> I often wonder why the great desire to do this and
>> what the problem is with just modifying the FOB. No
>> matter where the I/O control comes from you still
>> have to build a minimal interface for the signals.
>> Having it all come from one place, the FOB, has
>> several advantages. One is you can use the code as it
>> is now, the other is is you are not tying up I/O on
>> the main board and running wires from two different
>> places.
>>
>> In our testing I have built and tested it both ways
>> GPIO from the RPi2 or the FOB and I honestly think
>> it is easier to just modify the FOB. I have written
>> an article showing an easy way to modify the FOB that
>> I think most hams who have soldering and small
>> construction experience could handle. It saves you
>> about $70/node to do this and a couple of hours of
>> your time. The article is in the how-to section at
>> hamvoip.org <http://hamvoip.org>
>>
>> Here is a direct link to it -
>>
>> http://crompton.com/hamradio/usb_fob_simple_modification/
>>
>> So give it a try. You certainly don't have much to
>> lose at about $3.50 in single quantities!
>>
>> I would be glad to answer any questions you may have
>> about this project.
>>
>> *73 Doug
>> WA3DSP
>> http://www.crompton.com/hamradio*
>>
>> _______________________________________________
>>
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>> arm-allstar at hamvoip.org <mailto:arm-allstar at hamvoip.org>
>> http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
>>
>> Visit the BBB web page -
>> http://www.crompton.com/hamradio/BeagleBoneBlackAllstar/
>>
>>
>>
>> _______________________________________________
>>
>> arm-allstar mailing list
>> arm-allstar at hamvoip.org <mailto:arm-allstar at hamvoip.org>
>> http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
>>
>> Visit the BBB web page -http://www.crompton.com/hamradio/BeagleBoneBlackAllstar/
>>
>> For me, it is my eye site, isn't as good as it use to be and
>> everything has gotten way to small.
>> Just finished up building a controller and had to use a 5x
>> magnifier. At least when you bread board stuff you can space
>> things 2 microns further apart than half an atom:)
>> I think most hams are older now. I don't see the younger
>> crowd getting in to the hobby, sad to say. So size of stuff
>> is more important to me now. As I wont tackle a project that
>> requires a lot of smt components.
>> Mike
>>
>> _______________________________________________ arm-allstar
>> mailing list arm-allstar at hamvoip.org
>> <mailto:arm-allstar at hamvoip.org>
>> http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
>> Visit the BBB web page -
>> http://www.crompton.com/hamradio/BeagleBoneBlackAllstar/
>>
>>
>> _______________________________________________
>>
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>> arm-allstar at hamvoip.org <mailto:arm-allstar at hamvoip.org>
>> http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
>>
>> Visit the BBB web page -http://www.crompton.com/hamradio/BeagleBoneBlackAllstar/
>>
>>
>>
>>
>> _______________________________________________ arm-allstar
>> mailing list arm-allstar at hamvoip.org
>> <mailto:arm-allstar at hamvoip.org>
>> http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
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>>
>>
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>>
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>> arm-allstar at hamvoip.org <mailto:arm-allstar at hamvoip.org>
>> http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
>>
>> Visit the BBB and RPi2 web page -http://hamvoip.org
>
>
> _______________________________________________
>
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> http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
>
> Visit the BBB and RPi2 web page - http://hamvoip.org
>
>
>
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>
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