[PD] Piezo, trigger, Arduino

olsen sesselastronaut at googlemail.com
Fri Jun 17 15:45:26 CEST 2011

ej pierre regarding sensitivity a FSR = force sensitive resistor might be interesting as well?!

On 06/17/2011 03:15 PM, Pierre Massat wrote:
> 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.
> Pierre
> 2011/6/17 Roman Haefeli <reduzent at gmail.com <mailto: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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