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PICList Thread
'[EE] Beat Flasher'
2005\08\02@010021 by Phil Keller

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I am thinking about building a PIC based flasher that flashes to the
beat of the music.  I am sure that it has been done before, I just can
not seem to find it via Google or on the PIC_List archives.

One way is to have a low pass Op-Amp filter that connects to the PIC A/D
input or Comparator input and either turns the LED on or off when ever a
signal edge is detected.  I keep thinking that there has to be an easier
way.  How do the cheep designs do this?  A passive low pass filter seems
like it would load the driving circuit, so I am assuming that it
requires an Op-Amp.

Any pointers would be greatly appreciated.

Phil



2005\08\02@014421 by Jinx

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> I am thinking about building a PIC based flasher that flashes to
> the beat of the music.  I am sure that it has been done before, I
> just can not seem to find it via Google or on the PIC_List archives.

Google for color organ circuit

eg top result

http://www3.telus.net/chemelec/Projects/Color-Organ/Color-Organ.htm

or sound-to-light circuit

http://www.faszl.com/soundlight.htm

2005\08\02@014440 by Justin Richards

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I have always wanted to stick a little mirror to a speaker cone and
fire a laser at it while it is pumping out tunes.  It would have to
look impressive I think.

One day ....

Justin

On 8/2/05, Phil Keller <spam_OUTPhilTakeThisOuTspampkeller.net> wrote:
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> -

2005\08\02@094237 by Mario Mendes Jr.

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While you can do this with an ordinary pic, I think this would be a great
first experiment with a dsPIC.

Good luck.


Mario

{Quote hidden}

> -

2005\08\02@113049 by Martin Klingensmith
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Justin Richards wrote:

>I have always wanted to stick a little mirror to a speaker cone and
>fire a laser at it while it is pumping out tunes.  It would have to
>look impressive I think.
>
>  
>
It does look interesting. Just take a cheap laser pointer and attach
something reflective to a speaker and try it out.
Doesn't do much good for the music quality though.

--
Martin Klingensmith
http://wwia.org/
http://nnytech.net/

2005\08\02@151106 by Peter

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On Tue, 2 Aug 2005, Justin Richards wrote:

> I have always wanted to stick a little mirror to a speaker cone and
> fire a laser at it while it is pumping out tunes.  It would have to
> look impressive I think.

I did that a long time ago. There are problems. You have to use proper
optics to project the tiny movements and the laser starts looking dim
real quick by the time the image is larger than 2".

Peter

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