[LAD] [OT] DIY Trigger - Piezo to MIDI to PC

Nedko Arnaudov nedko at arnaudov.name
Fri Oct 17 15:09:22 UTC 2008

"Ray Rashif" <schivmeister at gmail.com> writes:

> And regarding MIDI, if I want to take into consideration dynamics, and let
> the piezo trigger MIDI messages with varying attack information, how would
> it be done? So depending on the voltage generated, it'd be a MIDI-ON but the
> final message to the computer (audio interface) would be a "MIDI-ON &&
> ATTACK == 75" sort of logic. Sorry for the noobish description, have just
> started to dabble into (audio/midi) electronics.

I know a way to implement this. I've read it somewhere in
Internet. piezo output is limited using zener diode (you want to do this
anyway because next electronic components may get burned out). Then you
can measure width of the impuse. Wider the impulse is, more "attack" you
have. In midi terms drum attack becomes midi note on velocity parameter.

> I understand the concept and design roughly and I can move on by reading the
> construction manual (refering to edrum's DIY guide), but at the moment I'm
> looking for a quick way to build a trigger as I need it asap (and no $$ for
> a real trigger kit/module).
> _______________________________________________
> Linux-audio-dev mailing list
> Linux-audio-dev at lists.linuxaudio.org
> http://lists.linuxaudio.org/mailman/listinfo/linux-audio-dev

Nedko Arnaudov <GnuPG KeyID: DE1716B0>
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