Bristol Digest, Vol 560, Issue 5

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Today's Topics:

1. R/C Waveforms for Status Power Plugs (Peter Hemmings)
2. Re: R/C Waveforms for Status Power Plugs (David Smith)
3. Re: R/C Waveforms for Status Power Plugs (Peter Hemmings)
4. Re: R/C Waveforms for Status Power Plugs (David Smith)


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Message: 1
Date: Fri, 25 Jul 2014 16:07:34 +0100
From: Peter Hemmings <peter@hemmings.eclipse.co.uk>
To: Bristol and Bath Linux User Group <bristol@mailman.lug.org.uk>
Subject: [bristol] R/C Waveforms for Status Power Plugs
Message-ID: <53D272B6.9070203@hemmings.eclipse.co.uk>
Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"

Hi,

I have been playing at getting a pi to (eventually) mimic a "R/C" from
"Status" power sockets.

I have been following the method below and will have to learn to do a
bit of programming using sample scripts!!

http://www.hoagieshouse.com/RaspberryPi/RCSockets/RCPlug.html

I now have a waveform from my R/C (socket 4 -on) and need confirmation
of interpretation of the code.

Attached is a copy of the waveform (Audacity) which seems to me to have
25 pulses which I assume is wrong!

The pulse lenghts seem to be of the same proportion as those in the article:

short pulse 2.9usec
longer pulse 8.95usec
reset pulse 9.5 milliseconds

I know there are several protocols used for R/C's so need to establish
timings/code before going further.

Assuming the small negative pulse is a zero, I think the code is:
0100110100000011001111100

but I assume thats not quite correct, any comments/observations?

If anyone is interested I can bring some H/W tomorrow.

BTW it is a very l o n g time since I dabbled with waveforms!


Regards

--
Peter H
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Message: 2
Date: Fri, 25 Jul 2014 15:14:37 +0000
From: David Smith <David.Smith@imgtec.com>
To: Bristol and Bath Linux User Group <bristol@mailman.lug.org.uk>
Subject: Re: [bristol] R/C Waveforms for Status Power Plugs
Message-ID:
<15A9D35B5490FC49AC0524AE3A085F086A1475@BRMAIL01.br.imgtec.org>
Content-Type: text/plain; charset="us-ascii"

> -----Original Message-----
> From: bristol-bounces@mailman.lug.org.uk [mailto:bristol-
> bounces@mailman.lug.org.uk] On Behalf Of Peter Hemmings
> Attached is a copy of the waveform (Audacity) which seems to me to have
> 25 pulses which I assume is wrong!

No, the file you've attached seems to be a setup file which tells audacity how to interpret the *actual* waveform files, which are called "e0000ad3.au" and "e0000623.au".



------------------------------

Message: 3
Date: Fri, 25 Jul 2014 17:45:52 +0100
From: Peter Hemmings <peter@hemmings.eclipse.co.uk>
To: Bristol and Bath Linux User Group <bristol@mailman.lug.org.uk>
Subject: Re: [bristol] R/C Waveforms for Status Power Plugs
Message-ID: <53D289C0.40606@hemmings.eclipse.co.uk>
Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"

On 25/07/14 16:14, David Smith wrote:
>> -----Original Message----- From: bristol-bounces@mailman.lug.org.uk
>> [mailto:bristol- bounces@mailman.lug.org.uk] On Behalf Of Peter
>> Hemmings Attached is a copy of the waveform (Audacity) which seems
>> to me to have 25 pulses which I assume is wrong!
>
> No, the file you've attached seems to be a setup file which tells
> audacity how to interpret the *actual* waveform files, which are
> called "e0000ad3.au" and "e0000623.au".

Oops!

Attached is an MS (spit) wav file that most should be able to see - if
they wish!

>
> _______________________________________________ Bristol mailing list
> Bristol@mailman.lug.org.uk
> https://mailman.lug.org.uk/mailman/listinfo/bristol
>

Regards
--
Peter H
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Message: 4
Date: Fri, 25 Jul 2014 16:57:27 +0000
From: David Smith <David.Smith@imgtec.com>
To: Bristol and Bath Linux User Group <bristol@mailman.lug.org.uk>
Subject: Re: [bristol] R/C Waveforms for Status Power Plugs
Message-ID:
<15A9D35B5490FC49AC0524AE3A085F086A14B1@BRMAIL01.br.imgtec.org>
Content-Type: text/plain; charset="us-ascii"

> From: bristol-bounces@mailman.lug.org.uk [mailto:bristol-
> bounces@mailman.lug.org.uk] On Behalf Of Peter Hemmings
> Attached is an MS (spit) wav file that most should be able to see - if they
> wish!

I'll have to look at it at home - my office PC helpfully tries to open the file and play it through my headphones...Doh!



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End of Bristol Digest, Vol 560, Issue 5
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