<G>

Sampling rate is going to be another issue for me to resolve, anyway.  I
did get a couple good suggestions for the Peak hold amp.

Also, I have a pair of ADXL150JQC accelerometer samples coming to try out,
per your suggestion.

Thanks all.  I know there are a few people here who play with MIDI, so I
may be back once I get to dabbling with that portion.  First task is
getting the ADXL's in and tied into Brian's Pk hold circuit.

--Joe Jansen




pic microcontroller discussion list <PICLIST@MITVMA.MIT.EDU> wrote on
03/30/2004 11:43:42 AM:

> ...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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> >
>
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