[arm-allstar] 4x4 Matrix Keypad Command Entry

[Travis French]

Thank you Doug!   I just ordered 3 to play with and I already have the keypads on order. I really like the idea of the hardware decoding taking the load off the Pi. 

As for the BCD channel steering, I am finding that this link is not working: https://hamvoip.org/hamradio/channel_steering/ . This is where I would find info on the script you wrote, correct?

Either way, you have put some strong wind in my sails today and look forward to making this work.

Thanks again!

Travis French - K2PCB




-----Original Message-----
From: ARM-allstar <arm-allstar-bounces at hamvoip.org> On Behalf Of "Doug Crompton via ARM-allstar"
Sent: Tuesday, September 18, 2018 4:26 PM
To: ARM Allstar <arm-allstar at hamvoip.org>
Cc: Doug Crompton <wa3dsp at gmail.com>
Subject: Re: [arm-allstar] 4x4 Matrix Keypad Command Entry

Travis,

 No, you are not off your rocker. In its simplest form this could work but a script would need to be written that would scan rows or columns and detect contact closure. A better approach would be a hardware decoder like this -

https://www.futurlec.com/Keypad_Decoder_Board.shtml

Which would put out BCD that could be decoded with 3 or 4 bits of Pi GPIO.
I already wrote a BCD channel steering script and it could be easily adapted.


*73 Doug*

*WA3DSP*

*http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*


On Tue, Sep 18, 2018 at 2:14 PM "Travis French via ARM-allstar" < arm-allstar at hamvoip.org> wrote:

> Good Afternoon,
>
> I seem to recall at one point where someone referenced the concept of 
> using a matrix keypad to enter commands into a node. This concept is 
> something that I am interested in but I could not find the original 
> email that spoke of it nor any how-to's that went into detail on this 
> unless I missed it.
>
> I have a radio-less node on my desk and a RF mobile node in my truck 
> that I was thinking this would be great for. Especially in the mobile. 
> It may seem trivial to some but a dash mounted keypad would require 
> only one hand to operate in lieu two for the mic DTMF entry let alone 
> using a smart phone to dial in through IAXRPT. I have been a ham since 
> 1999 and it still fells awkward to key DTMF commands into the mic 
> while driving. Not to mention, this could also help with folks that 
> are having DTMF decode issues with their radioless nodes. Just a thought. Maybe a win win.
>
> In my node enclosures, I have plenty of real estate to mount 4x4 
> matrix keypads. In fact, I have already ordered a couple to play with 
> in the event that this is possible. I have done some research on how 
> the Pi can interpret the key presses from a generic perspective. If I 
> recall it correctly, someone here mentioned that a script could be set 
> up to monitor for the * key as the start of the command string and the # for the execute.
> Of course with something like 3(node #) in the middle or a *76# to 
> disconnect all.
>
> Am I off my rocker here?
>
> Is this possible? Has anyone else done this?
>
> If so, I would love to learn how to do it. I guess it is "how to get 
> asterisk to respond to the interpreted key strokes" is where I get lost'
>
> Any help would be greatly appreciated.
>
> Travis E. French - K2PCB
>
>
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