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'[PIC]: IR learning Part Two'
2001\07\17@134632 by Barnaby Thieme

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Hello.

Thanks for the replies that I did get, but I have not quite found what I'm
looking for.  I am hopeful that there might be further information out
there.

I am designing a device that can learn remote controls in the field,
optimally without a PC.  I am interested in an IR learner that would analyze
and encode IR signals, and make those results available to a microcontroller
so that we could reproduce the code.  Has anyone seen such a component or
device, or worked towards that end?

Reproducing the signal is no problem once we have the carrier frequency and
the code structure.  We have a working device which does just that, but we
have to specify the IR information for the device on a remote-by-remote
basis.

The last time this topic came up several months ago, several people
expressed interest in such a device but nothing seemed to come out of it.
Anyone out there still interested?

Barnaby Thieme
Product Engineer, SP Controls, Inc.
spam_OUTbthiemeTakeThisOuTspamspcontrols.com

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2001\07\17@163342 by steve

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> I am designing a device that can learn remote controls in the field,
> optimally without a PC.  I am interested in an IR learner that would
> analyze and encode IR signals, and make those results available to a
> microcontroller so that we could reproduce the code.  Has anyone seen
> such a component or device, or worked towards that end?

I designed something like this for a client a few years back. Can't
help with code or too much information but I don't recall it being too
difficult. I used a 16F84 and used the fact that the remote sent the
data several times. First determine the carrier frequency (there
were only a couple of values) and save that information. Then
determine the minimum useful bit time and then sample at that rate
to create a bitstream which is stored. No effort was made to
decode it as the remote just had to regurgitate the bitstream.
IIRC, there was one system that toggled a bit with each send and
one (Sky TV) that used a baseband method. I think all the
consumer ones we tried worked.

It's not an 'off the shelf' solution but knowing that it is possible and
the general method is a big step forward.

Steve.

======================================================
Steve Baldwin                Electronic Product Design
TLA Microsystems Ltd         Microcontroller Specialists
PO Box 15-680, New Lynn      http://www.tla.co.nz
Auckland, New Zealand        ph  +64 9 820-2221
email: .....stevebKILLspamspam@spam@tla.co.nz      fax +64 9 820-1929
======================================================

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2001\07\17@204602 by Mark Newland

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I have a program for my Palm Pilot that will turn it into a remote control for
my TV, VCR, etc.  Would something like that work for you?

Barnaby Thieme wrote:

{Quote hidden}

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2001\07\18@011202 by Roman Black

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Barnaby Thieme wrote:
>
> Hello.
>
> Thanks for the replies that I did get, but I have not quite found what I'm
> looking for.  I am hopeful that there might be further information out
> there.
>
> I am designing a device that can learn remote controls in the field,
> optimally without a PC.  I am interested in an IR learner that would analyze
> and encode IR signals, and make those results available to a microcontroller
> so that we could reproduce the code.  Has anyone seen such a component or
> device, or worked towards that end?


Hi Barnaby, yes we have been selling them for years.
Most of the appliance shops sell "learning remotes"
although the pre-programmed ones seem to be getting
more common.

Our catalogue shows Dai-1chi and Remotec still make
them, from about $23 to $38 US trade price.
-Roman

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2001\07\19@030213 by Anand Dhuru

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part 1 152 bytes content-type:text/plain; (decoded 7bit)

If you need to capture / reproduce just one signal, here's a pretty neat
design found on the net that does the job.


part 2 10297 bytes content-type:application/x-zip-compressed; (decode)

part 3 136 bytes
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