[PD] Piezo, trigger, Arduino

Pierre Massat pimassat at gmail.com
Fri Jun 17 15:15:41 CEST 2011

Hi Roman, thanks for your reply. I'm afraid i can't use a soundcard to
capture the input from the piezo (I don't want to buy one just for three
little triggers). If what you're saying is true i guess i will just use
three switches and forget about the sensitivity.


2011/6/17 Roman Haefeli <reduzent at gmail.com>

> Hi Pierre
> Actually, I wouldn't connect the piezos to an arduino, but to a sound
> card, because the piezos will likely give very very short spikes and the
> sampling rate of the analogIns of the arduino is quite low (don't know
> the exact value) compared to the sampling rate of a common sound card.
> Also, you have more control in Pd to build a trigger detection filter
> then on the arduino. Also you would likely get much lower latency with a
> good audio setup than with the atmega->ftdi->usb->comport path. Also
> when using the soundcard, the latency is constant, while you would have
> glitches with the arduino.
> I'd be glad to hear other opinions, though, since my thoughts are purely
> theoretical. I haven't implemented a piezo-based trigger, neither with
> sound card nor arduino.
> Roman
> On Fri, 2011-06-17 at 14:27 +0200, Pierre Massat wrote:
> > Dear List,
> >
> > This is yet another question about Arduino. Sorry about that.
> > I want to use piezos to trigger samples using my arduino board. I want
> > the trigger to be sensitive, and a quick google search seems to show
> > that piezo is the way to go.
> > Does anybody have any experience with piezo triggers (what type of
> > piezo, isolating each piezo, etc.)? I will hit the piezos with my bare
> > fingers (no drumsticks or anything like that), but i guess it doesn't
> > really matter since i can control the threshold within Pd.
> >
> > This last sentence is just to make sure that everyone knows i'm
> > talking about piezos in case there wasn't enough occurences of the
> > word in my message.
> >
> > Cheers!
> >
> > Pierre
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