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mirko_3 l33t
Joined: 02 Nov 2003 Posts: 605 Location: Birreria
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Posted: Sun Mar 21, 2004 7:25 pm Post subject: infrared... is this possible? |
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Ok, here's the deal:
I wanted to steal the remote control from my tv and use it for my computer... this shouldn't be a problem, I understand that's lirc's main use.
Thing is, an infrared port costs quite a bit (about 40 euros ) so I asked my friends a bit, and found that one of them had these wireless headphones which use an infrared connection to receive data; problem (at least I think it's a problem): the base (I don't know what to call it, anyway, the thing that sends data to the headphones) has a jack like the ones that you plug into your sound card...
so, is it hopeless? or can I somehow use my remote control anyway? _________________ Non fa male! Non fa male! |
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tredman2 Apprentice
Joined: 06 Dec 2002 Posts: 169 Location: Holiday, FL
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Posted: Sun Mar 21, 2004 7:32 pm Post subject: InfraRed |
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mirko_3,
Checkout LIRC. They have alot of home grown infrared projects for Linux. Some of the software is even in the portage tree (app-misc/lirc, dev-python/pylirc and media-plugins/xmms-lirc), but the hardware pointers are on the web site.
Tim _________________ Tim
"I drank what?" - Socrates, 399 BCE |
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mirko_3 l33t
Joined: 02 Nov 2003 Posts: 605 Location: Birreria
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Posted: Mon Mar 22, 2004 1:26 pm Post subject: |
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yeah, I know about lirc, but the question was - is it possible to send/receive signals through my sound card, as that's where I would have to connect the infrared device... _________________ Non fa male! Non fa male! |
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nevynxxx Veteran
Joined: 12 Nov 2003 Posts: 1123 Location: Manchester - UK
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Posted: Mon Mar 22, 2004 1:33 pm Post subject: |
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mirko_3 wrote: | as that's where I would have to connect the infrared device... |
Wrong.....you just need a soldering iron and some patience.....google a bit with the make of the base station and see what you get _________________ My Public Key
Wanted: Instructor in the art of Bowyery |
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genneth Apprentice
Joined: 24 Mar 2003 Posts: 152 Location: UK
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Posted: Mon Mar 22, 2004 2:01 pm Post subject: |
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mirko_3 wrote: | yeah, I know about lirc, but the question was - is it possible to send/receive signals through my sound card, as that's where I would have to connect the infrared device... |
I presume that the earphone would send the data over as sound data... so you could write a userland program which watches the mic channel, and does a modem-like function and transform the data. So watch the mic channel and mash your remote a little, and see whether anything gets picked up. |
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nevynxxx Veteran
Joined: 12 Nov 2003 Posts: 1123 Location: Manchester - UK
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Posted: Mon Mar 22, 2004 2:13 pm Post subject: |
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Logically the reciever should just send out what it recieves as is, so there shouldn't even be modulation, just an exact[1] copy of the original output from the headphones/tv remote. Hooking the wires upto a serial port and watching that rather than the sound card would be a better bet I would think. Try it and see, a multimeter/scope on the led terminals on the remote, and on the output from the reciever (or better the signal you get fom the serial port, or both) should tell you if I'm right. Your looking for a matching signal. _________________ My Public Key
Wanted: Instructor in the art of Bowyery |
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mirko_3 l33t
Joined: 02 Nov 2003 Posts: 605 Location: Birreria
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Posted: Mon Mar 22, 2004 2:22 pm Post subject: |
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philips sbc hc042 is the brand and model of the base, and google turned up two useless pages of results; as for hooking it up to the serial port, I'll look into it later, I have to study now... I hope a soldering iron doesn't cost too much
as for programming, I only know what I read a couple years ago in my 'Sams Teach Yourself: C++ in 24 hours' - good book, but nothing practical, I don't know what libraries have what I need, ecc.
So I guess that's somewhat ruled out... (not totally, If I find a good tutorial somewhere... also postponed until I've finished studying)
thanks[/quote] _________________ Non fa male! Non fa male! |
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Useful Idiot Guru
Joined: 30 Aug 2002 Posts: 329 Location: Finland
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Posted: Mon Mar 22, 2004 2:25 pm Post subject: |
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Are you perhaps looking for something like this? At the end there are some instructions on how to setup your software. Both lirc and portaudio are in portage but if you emerge them you might have to do some hacking. _________________ [size=9]We are all in the gutter, but some of us are looking at the stars. |
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mirko_3 l33t
Joined: 02 Nov 2003 Posts: 605 Location: Birreria
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Posted: Mon Mar 22, 2004 3:41 pm Post subject: |
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hey, that seems to be exactly it...
now I patched the kernel, have a /dev/lirc/lirc0 file, can start the lirc daemon, and fount a config file. Only I can seem to get no i/o
I compiled lirc with the --with-driver=audio option.
I tried using irrecord --force and pushing buttons on my remote, but I get nothing.. the receiver is plugged into my sound card; must I define which jack? there seemed to be no reference to it on the link...
also, no hacking to be done for emerging them except defining --with-driver=audio in lirc's ebuild... _________________ Non fa male! Non fa male! |
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mirko_3 l33t
Joined: 02 Nov 2003 Posts: 605 Location: Birreria
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Posted: Mon Mar 22, 2004 4:12 pm Post subject: |
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update:
could it be that the device I'm trying to use as receiver is only capable of sending infrared signals?
I've plugged it into the line in slot, tried unmuting the relevant controls in alsamixer, and pressing some buttons on the remote. nothing
I've plugged it into the mic slot, unmuted the relevant controls, pressed the buttons, nothing. Only thing is, after unmuting the mic, if I move the jack in the sound card slot, I hear some noise in the speakers (like when you move the speaker's jack). this doesn't happen with the line in, so I'm sticking with this one.
I'm not even using lirc yet - I figured that I first had to get some noise on my speakers with the remote control, then start lirc to decode signals...
...help? _________________ Non fa male! Non fa male! |
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nevynxxx Veteran
Joined: 12 Nov 2003 Posts: 1123 Location: Manchester - UK
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Posted: Mon Mar 22, 2004 4:23 pm Post subject: |
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Ohhhh thats a transmitter isn't it........emmm....audio being a one way thing, I'd say your right and there isn't a reciever in there. There would be 1 on the headphones though. It seems a little strange to use ir for headphones though, are you sure it doesn't use radio? having wireless headphones that need line of sight to the reciever seems a lot strange to me. _________________ My Public Key
Wanted: Instructor in the art of Bowyery |
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mirko_3 l33t
Joined: 02 Nov 2003 Posts: 605 Location: Birreria
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