[arm-allstar] A simplified USB FOB modification
Peter Kendall
g7rpg at hotmail.com
Thu Jun 25 12:03:22 EST 2015
MASSIVE CORRECTION!
I've posted the code, see below.
to compile you need to link the wiringpi library so the command would be...
cc -o gp0xx gp0xx.c -I/usr/local/include -L/usr/local/lib -lwiringPi
Pin mode is the mode of the gpio pin i.e wiringPi 0 in this example.
digitalWrite 0,LOW = 0v or grounded or logic low
digitalWrite 0,HIGH =3.3v or logic high
you could use 3.3v to turn on a mosfet and drive anything.
On 25/06/2015 17:41, Larry wrote:
> Thanks Peter,
>
> Any chance you would share the source code for the GPIO off and on?
>
> Larry - N7FM
>
>
>
> On 06/25/2015 09:16 AM, Peter Kendall wrote:
>> 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*
>>>>
>>>> _______________________________________________
>>>>
>>>> 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/
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>>
>>>> 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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>>>> 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
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>>>> http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
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>>>>
>>>>
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>>>>
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>>>>
>>>> Visit the BBB and RPi2 web page -http://hamvoip.org
>>>
>>>
>>> _______________________________________________
>>>
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>>>
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>>>
>>>
>>>
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>>>
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>>>
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>>
>>
>>
>> _______________________________________________
>>
>> arm-allstar mailing list
>> arm-allstar at hamvoip.org
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>>
>> Visit the BBB and RPi2 web page -http://hamvoip.org
>
>
>
> _______________________________________________
>
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> arm-allstar at hamvoip.org
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>
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