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PICList Thread
'Capturing IR Remote Codes'
1997\11\24@091758 by Tom Handley

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  I'd like to capture codes from an IR remote, modify them, and transmit
them to a satellite receiver, VCR, and TV. I've seen various capture
circuits that connect to a PC and/or a PIC but I've been unable to find the
articles. I've searched Circuit Cellar Ink and Electronics Now. Any
references would be appreciated.

  My particular application would capture codes from an RCA DSS DRD505
(3rd generation) receiver IR/UHF remote. It would display the current remote
mode (DSS/VCR/TV) on a LED dot-matrix display. (ie: D/V/T). When in the VCR
or TV mode, it would map a few remote buttons to device-specific functions
(ie: "MENU/SELECT" would bring up the VCR "PROGRAM" mode).

  I'm using the standard Sharp/Radio Shack 40Khz IR front-end. It's one
thing to look at the output on the scope and to implement a simple logic
analyzer on a PIC or PC... I'd prefer to analyze the codes on the PC.
I have a good idea how to do this but I know this has been done before.
Again, any help would be appreciated. Thanks,

  - Tom

1997\11\24@134237 by Mike Keitz

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On Mon, 24 Nov 1997 06:15:51 -0800 Tom Handley <spam_OUTthandleyTakeThisOuTspamTELEPORT.COM>
writes:

>   I'm using the standard Sharp/Radio Shack 40Khz IR front-end. It's
>one
>thing to look at the output on the scope and to implement a simple
>logic
>analyzer on a PIC or PC... I'd prefer to analyze the codes on the PC.
>I have a good idea how to do this but I know this has been done
>before.

I haven't tried it, but I've heard of connecting the IR receiver output
(maybe through an attenuator) to LINE IN on a sound card.  This seems
like it would work, there may be some artifacts from AC coupling but the
edges in the signal would still show up.  Most software for recording and
editing with a sound card has an oscilloscope-like display.  Some of it
has accurate time references displayed.  I think GoldWave allows you to
zoom down to a single sample, and displays the exact time.

1997\11\24@163952 by Martin Darwin

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face
Yup, this is how I did it last night :). I was trying to decode my samsung
remote. Since I don't have the actual specs of the protocol used I just
figured it out manually. It is

<PREAMBLE><8-bit byte><Complement of 8 -bit byte><1>

I just used the standard all in one receiver and demodulator and fed
the signal directly into the sound card. The sound card seems to be able
to accept a 5 volt signal (though it is probably not recommended). The
resulting waveforem was quite visible and the edges of the samples were
nice and sharp (recorded at 44Khz). Now in order to actually decode this
signal on the fly will require using an i/o port and a timer.


For the samsung format a high is .8ms of 1 followed by 1.5ms of 0 and a
low is .8ms of 1 followed by .5ms low. So to decode:

       - set interrupt to trigger on falling edge
       - when int occurs start timer & set int to trigger on rising edge
       - on rise stop the timer and get the amount of time.
       - if it is 1.5ms then it is a 1 else a 0
       - start again to get next bit

I am not sure if i explained this very well, but anyway.
Now i have to code the pic software when i get some spare time :)

MD



On Mon, 24 Nov 1997, Mike Keitz wrote:

{Quote hidden}

1997\11\25@045712 by Paul BRITTON

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face
>
>On Mon, 24 Nov 1997 06:15:51 -0800 Tom Handley <thandleyspamKILLspamTELEPORT.COM>
>writes:
>
.
.
.
.
.
>       Most software for recording and
>editing with a sound card has an oscilloscope-like display.  Some of it
>has accurate time references displayed.  I think GoldWave allows you to
>zoom down to a single sample, and displays the exact time.

Yes, it does!

1997\11\25@123715 by Jorge Pi

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face
Do you recomend an attenuator circuit to limit the input in the sound card?


-----Original Message-----
De: Paul BRITTON <.....paul.brittonKILLspamspam.....MMSUK.CO.UK>
Para: EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU <PICLISTspamspam_OUTMITVMA.MIT.EDU>
Fecha: Martes 25 de Noviembre de 1997 3:55 AM
Asunto: Re: Capturing IR Remote Codes


|>
|>On Mon, 24 Nov 1997 06:15:51 -0800 Tom Handley <@spam@thandleyKILLspamspamTELEPORT.COM>
|>writes:
|>
|.
|.
|.
|.
|.
|>       Most software for recording and
|>editing with a sound card has an oscilloscope-like display.  Some of it
|>has accurate time references displayed.  I think GoldWave allows you to
|>zoom down to a single sample, and displays the exact time.
|
|Yes, it does!
|

1997\11\27@043243 by Alan King

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Do an Altavista search on LIRC.  (linux infra red controller or
similar)  Info on how to hook the sharp/RS module up to the serial port
and read it manually on the control signal bits.  I have a simple
Quickbasic program that scrolls 1s and 0s up the screen so you can see
what's hitting it in realtime..  If you'd like I can put it up on the
net..


{Quote hidden}

1997\11\27@135917 by Tim Kerby

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Put it up, please.  I would find this useful too.  How about a save to file
of this dump that can then be imported into a spreadsheet and graphed in
real time.

Tim


At 04:26 27/11/97 -0500, you wrote:
{Quote hidden}

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1997\11\30@032046 by Tom Handley

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re: Using a Sound Card

  Mike, that's a good idea! I have a Sound Blaster AWE32 card and part of
the software can be used as a low frequency scope. The card's sample rate
can be adjusted from 5 to 45Khz. The pulse train from the remote appears
to be in 50ms bursts.

  I was also thinking about using an IR photo transistor to capture the
40Khz carrier and use that to clock data from the module's output to the
parallel port.

  - Tom

At 01:21 PM 11/24/97 -0500, you wrote:
{Quote hidden}


'Capturing IR Remote Codes'
1997\12\01@040720 by Tom Handley
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  Alan, I'll search for "LIRC" and I'd be interested in seeing your
QBasic program. Thanks!

  - Tom

At 04:26 AM 11/27/97 -0500, you wrote:
{Quote hidden}

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