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How can I make led bars that go up the corners of my walls that go up with the bass of whatever song I am playing? Answered

I want to know if their is a kit or something I can buy and what lights would be capitalize of going up and down the corners of my walls with the bass. I have stereo speakers that hook up to a receiver but I also have a carver TFM-35x.  

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Best Answer 4 years ago

Sure! Just whip up a low pass filter to pass bass frequencies and add a circuit which can get the envelope of the signal (peak detector with a bleeder resistor) and pass that into the a transistor in series with the LEDs. That might be the easiest way other than buying existing parts designed to do this, of which I know none.

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turbiny
turbiny

Answer 4 years ago

is there a way to do this with addressable led strips and arduino?

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theninja884
theninja884

Answer 4 years ago

You can wire it directly to you subwoofer or you sub output, if you are not wored about your speakers. That is an easy way to do it but it is not as safe so I am trying to find an alternative.

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theninja884
theninja884

Answer 4 years ago

That sounds very complicated and expensive.

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Answer 4 years ago

What you are after is of course some signal to control the brightness of the LED in response to bass. More bass, more light. right?

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First we want to reject high frequencies and get just the base. A resistor in series with a capacitor forms a very basic low pass filter. The capacitor (connected between ground and the output) resists rapid changes in voltage. The value of the resistor and capacitor set the cutoff frequency. You can do a few things to improve it, but I think it's good enough. These 2 parts can be obtained for pennies and in large quantities.

http://www.electronics-tutorials.ws/filter/filter_...

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Now we have just the base frequencies and have attenuated the higher frequencies, now we need a way to get this raw signal and figure out "how much" base there really is. We need a way to get the peak amplitude of this base-enhanced signal. In other words, we need to detect the envelope. The common way to do this is shown in the link below. It also gives helpful advice for making it.

https://www.st-andrews.ac.uk/~www_pa/Scots_Guide/R...

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Finally, you just need to use this to modify the current driving the LEDs. This is also trivial.

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theninja884
theninja884

Answer 4 years ago

Ya i want it to be able to go up and down the wall like an equlizer but only for the low sub frequencys.

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SA-DIY
SA-DIY

Answer 4 years ago

Complicated, maybe but expensive, certainly not.

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steveastrouk
steveastrouk

4 years ago

There are a bunch of ideas on the right here >>>>>>>>>>>>>>