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LED's pulsing to music?

post #1 of 8
Thread Starter 

This is what I want to achieve: I want my case lighting to pulse in time with the audio output from my PC.


Here's how they did this one: http://hacknmod.com/hack/led-light-b...to-your-music/ I need that analog effect -- the LED's fade in and out appropriately, rather than just abruptly turning off and on.

The problem I have with this is that it requires a 1/8'' plug going into the PC's audio out. Well, obviously I want my speakers to be hooked up to that, and I'm not really comfortable using a splitter or something that may degrade audio quality (even a miniscule amount). Besides, I want this all to be internal with no extra wires running outside the box.

How can I make this happen? I thought about maybe trying the S/PDIF out from my sound card, but I'm not sure if that would work in the same way or not.

I know people have used software to do it, hooking an LED controller up to an internal serial header... but I'm not sure that new motherboards (P67) are going to have that? I'm not versed in this interface at all.

Is there maybe a non-DIY solution? Something that can go right to a USB header with a light piece of software to pull appropriate data from the soundcard?

Or are there any other ideas? I really appreciate it, I know this can be done and done right, the way that I have envisioned.
Edited by koda - 1/24/11 at 11:52pm
    
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post #2 of 8
I know they sell CCLF inverters that will go to music.

look for sound activated inverters on frozencpu
post #3 of 8
    
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post #4 of 8
Quote:
Originally Posted by thrasherht View Post
I know they sell CCLF inverters that will go to music.

look for sound activated inverters on frozencpu
^^this look for a sound activated CCFL
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post #5 of 8
Or for a DIY solution, use a Optocoupler, connected in parallel with your soundcard's output, and then use the other 2 pins from coupler in series with the led's you want to make them glow, add one parallel capacitor depending on your desired fade time to the led strip and you get the same effect..

edit: If you are not comfortable with using splitters and want it all to be internal, then solder the optocoupler from inside to your soundcard..
Edited by dragonxwas - 1/25/11 at 12:07am
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post #6 of 8
Thread Starter 
Thanks! That was quick. +Rep for you guys.

The sound activated cold cathodes are pretty rad, I hadn't seen those before. What I'm worried about is that they're controlled via microphone... which means positioning, acoustics, ambient noise, etc. are all going to play a role. I pretty much need to be able to drop this box into any situation and have it work flawlessly. It needs to be "gig-ready" you could say.

Besides, I sort of like the effect of that box in the original post reacting to just one channel... if noise in general is going to activate the lights, I don't think it would look nearly as clean or synchronous.

Optocoupler, eh? I'm completely new when it comes to circuitry. I don't mind buying a soldering iron, doing some research, and getting my hands dirty (relatively speaking - you guys are in another league) to get this done, but I don't think I would trust myself to solder onto my expensive soundcard... I imagine there's some risk involved there for a first-timer.

Edit: If it turns out that soldering to the card is the best solution I'll either make the attempt or find someone else that can do it for me. Is there any chance you could elaborate on the process? Maybe a quick little diagram I could work off of?

Can I not do anything with the S/PDIF header on the soundcard? It is basically just another audio out, yeah?
Edited by koda - 1/25/11 at 12:45am
    
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post #7 of 8
koda cant wait to see a vid of your case flashing to some music. i would love to do this but have no cloud how or where to start. could you lend me a hand?
    
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post #8 of 8
Quote:
Originally Posted by koda View Post
Thanks! That was quick. +Rep for you guys.

The sound activated cold cathodes are pretty rad, I hadn't seen those before. What I'm worried about is that they're controlled via microphone... which means positioning, acoustics, ambient noise, etc. are all going to play a role. I pretty much need to be able to drop this box into any situation and have it work flawlessly. It needs to be "gig-ready" you could say.

Besides, I sort of like the effect of that box in the original post reacting to just one channel... if noise in general is going to activate the lights, I don't think it would look nearly as clean or synchronous.

Optocoupler, eh? I'm completely new when it comes to circuitry. I don't mind buying a soldering iron, doing some research, and getting my hands dirty (relatively speaking - you guys are in another league) to get this done, but I don't think I would trust myself to solder onto my expensive soundcard... I imagine there's some risk involved there for a first-timer.

Edit: If it turns out that soldering to the card is the best solution I'll either make the attempt or find someone else that can do it for me. Is there any chance you could elaborate on the process? Maybe a quick little diagram I could work off of?

Can I not do anything with the S/PDIF header on the soundcard? It is basically just another audio out, yeah?
The boxes are really only ment to pick up the bass notes, so they flash to the beat. So you might not really get what you are looking for if you want more then the beat.
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