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Old 22nd November 2005, 07:58 AM   #1
sss is offline sss  Israel
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Default need help with IR remote controller

ok guys , i know nothing about IR so any help would be appriciated
thats what i'm trying to do ....

i got a remote controller of a cd player thati dont use (the remote).
now i want to make a box that will swith between some interconnects and stuff like that ..thts not important ...
what i want is to know how it works ..
for example : when i'm pressing the play button on the remote its generates some freq and sending it through that IR led?
if so then ...lets say when i press play i get 20khz square wave so when i press stop i'll get a different freq? lets say 21 khz? something like that? or is it like FM band when the base freq is the same ...

one more

what do i get at the IR reciever? some small voltage ? how small? ....
thanx to anyone that replies


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Old 22nd November 2005, 08:27 AM   #2
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The IR sends a specific code to the LED. In the receiver usually you find an IC that receives and demodulates the signal followed by an IC that decodes the code and provides the right output bits for you to use. Google will give you the type numbers etc. Try 'RC5", that's the Philips code, compatible with many others, and they have also the ICs. Its really simple to put together using the ICs.

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Old 22nd November 2005, 09:14 AM   #3
sss is offline sss  Israel
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heh , its more complicated then i thought
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Old 22nd November 2005, 09:26 AM   #4
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Not really. All the real work has been done by those design engineers. You just have to pull your wallet

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Old 22nd November 2005, 09:28 AM   #5
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i gotta use pic controllers ....
i hate all those digital chips
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Old 22nd November 2005, 09:33 AM   #6
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Hey, if you're good in pics, that's even easier. There is lots of source code floating around on the 'net to decode the address and action code from an RC data stream and do whatever you want. I've done it myself many years ago, works like a charm. First thing is to read up on RC5 how the device address and action code is set up. Then you feed the data into a pic serially, watch for the start bits, decode the stuff and you're done.

Like her http://www.rotgradpsi.de/mc/etc/rc5decoder.html
or here http://sami.ticalc.org/irlink/e_soft.htm

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Old 23rd November 2005, 05:01 PM   #7
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There was a learning remote receiver thingy in Nuts & Volts Feb 1998, "IR Remote Decoder," by Terry Weeder; that would be another good place to start.
Code here: http://nutsvolts.com/~downloads/irremote.zip

Or just go down to the mega mart and buy a remote-controlled A/V switch box for about $40. Maybe that'll do what you need?
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Old 24th November 2005, 12:00 AM   #8
sss is offline sss  Israel
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Quote:
Originally posted by dangus
There was a learning remote receiver thingy in Nuts & Volts Feb 1998, "IR Remote Decoder," by Terry Weeder; that would be another good place to start.
Code here: http://nutsvolts.com/~downloads/irremote.zip

Or just go down to the mega mart and buy a remote-controlled A/V switch box for about $40. Maybe that'll do what you need?
probably it will , the problem is i want to use my existing remote , i dont want another remote in the system

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