...increasing enough sampling rate? ;-)
Consider you will not achieve a great linearity with piezos: I happened to
see on a drumset they use single chip accelerometers (made by AD, but I'm
not sure...)

Ale

On Tue, 30 Mar 2004, Joe Jansen/TECH/HQ/KEMET/US wrote:

> Hey everyone!
>
> I have been unsuccessful googling, and was hoping someone here would
> either have an answer, a web link, or even recommended reading for me.  I
> am trying to build an electronic drum set similar to the overpriced models
> I see at the music store.  My thought is to use a piezo element embedded
> in a rubber pad, through an op-amp, and feed the signal to an A/D
> converter to do the velocity detection.  This would then go to a PIC,
> which would convert the velocity info into a MIDI signal and feed it to
> the keyboard for wave generation and playback.  Not too terribly fancy,
> but should be functional.
>
> My question is:  How do I insure that I am running my A/D conversion on
> the highest point of the piezo elements output?  the spike that is
> generated will be proportional to the strength of the impact, but I want
> to make sure that I run my conversion on the highest point of the output.
> Is there a way to capture the peak output and then run the A/D conversion
> on that?  Any other suggestions?  I definitely want the velocity info to
> control the volume of the playback, or the whole thing becomes a gimmick.
>
> Thanks for any suggestions!!!!!
>
> --Joe Jansen
>
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