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Topic:
SIRC with Philips Remote
This thread has 2 replies. Displaying all posts.
Post 1 made on Saturday January 23, 2010 at 11:48
cele_82
Lurking Member
Joined:
Posts:
January 2010
2
Hi,
I've built this simple circuit



to use my TV remote(philips) with my PC.


The problem is that with this software

[Link: pcremotecontrol.com]

when I watch the data coming in when I press 1 button on my remote, it is always different.

for instance

the first time is

5C444 1010 F17 F88 1005 F00 1011
15F6B FAB FFA F85 FA1 FB7 F82

the second

B84D2 FE9 FA4 F78 F98 F9D FCA 15BCB FBC F7F
1165 D68 1040 F78

Ideas?
Post 2 made on Saturday January 23, 2010 at 16:03
johnsfine
IR Expert
Joined:
Posts:
September 2002
5,159
Since you built an IR receiver compatible with WinLIRC, you might try using WinLIRC instead of the software you are using now.
http://winlirc.sourceforge.net/

It takes a significant amount of analysis to convert the raw signal you get from an IR receiver into something that would be consistent enough to make a meaningful comparison between two samples of the same command.

I don't know what analysis the software you are using is supposed to do. I didn't see any link to technical info from the page whose URL you posted.

The hex data you posted does not look to me like a raw capture of an IR signal (before analysis) and it looks even less like the output of any useful analysis of a raw capture. I don't know what it is.

Also, if anyone else wants to help here, they probably would want to look at a better explanation of the diagram you posted. That is at
[Link: lnx.manoweb.com]

Also, what do you mean by "SIRC"? The meaning I know about doesn't fit your usage.

Edit: After dropping an incorrect assumption, I now do see how the information you posted is a raw capture of an IR signal. It doesn't look like a correct raw capture, especially not of any signal I would expect from a Philips TV remote. But I do understand it as a raw capture and I see that the two samples you provided are actually the same raw capture.

Before I try to explain why those are the same raw capture, I'd like to get some idea of how incorrect the capture is and what kind of signal this is that you are getting from a Philips TV remote. The best way to get that info is to look at the signals for a few other digits.

I (or other experts here) can learn a lot by looking at how the digits differ from each other.

The raw data you have is a sequence of durations, which is the most typical kind of raw data. Initially I didn't think of that possibility, because there are so few durations per frame and all the durations within each frame are equal within the tolerance of capture error. So there is barely any information content per signal.

There are a few obsolete IR protocols with so little information content per signal. But I'm still leaning toward the theory that the raw capture is wrong.

Last edited by johnsfine on January 23, 2010 16:34.
OP | Post 3 made on Sunday January 24, 2010 at 07:01
cele_82
Lurking Member
Joined:
Posts:
January 2010
2
Hi,
thanks for the answer the software was OK, I was using a USB Serial converter and this was the problem

Now with a real serial port there is no problem


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