[arm-allstar] A simplified USB FOB modification
Peter Kendall
g7rpg at hotmail.com
Thu Jun 25 14:00:47 EST 2015
I've learnt something new today, didn't know you could do that so easily.
On 25/06/2015 19:06, Doug Crompton wrote:
> Am I missing something here? Why not just use the wiringpi command
> line gpio commands?
>
> gpio mode <pin> in
> gpio mode <pin> up
>
> for input or for output
>
> gpio mode <pin> out
> gpio mode <pin> 1|0
>
> These could be put in a script and called from Asterisk.
>
>
> *73 Doug
> WA3DSP
> http://www.crompton.com/hamradio*
>
>
> ------------------------------------------------------------------------
> Date: Thu, 25 Jun 2015 17:16:02 +0100
> From: g7rpg at hotmail.com
> To: arm-allstar at hamvoip.org
> Subject: Re: [arm-allstar] A simplified USB FOB modification
>
> 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/
> <https://www.flickr.com/photos/127794264%40N08/18126465794/in/datetaken-public/>
>
> COS example
> https://www.flickr.com/photos/127794264@N08/17197162979/in/datetaken-public/
> <https://www.flickr.com/photos/127794264%40N08/17197162979/in/datetaken-public/>
>
> Example node with 'blob fob' and pi PTT
> https://www.flickr.com/photos/127794264@N08/18458513778/in/datetaken-public/
> <https://www.flickr.com/photos/127794264%40N08/18458513778/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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>
>
>
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>
> 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
>
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> http://www.crompton.com/hamradio/BeagleBoneBlackAllstar/
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>
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