[PD] Re : piezo sensor to pduino object

[Ricardo Lameiro]

try to put some medium sized resistor in series with the piezo and see if it
gets more tangible data input. Piezzos can output very high voltages.

2010/9/20 david lemarechal <d_lemarechal at yahoo.fr>

> Hi
>
> I think the easier way to get info from the piezo is to plug it in a sound
> card preamp and then use [peakamp~ ]
> Otherwise you should do a bit of electronics to transform the tiny AC
> voltage of the piezo output into a DC amplified voltage to match the analog
> input of arduino.
> You'll have then to use [peakamp~] or something similar in arduino to be
> sure to take the highest value in a certain time, rather than take a
> "snapshot" of the analog input at the arduino clock frequency (like you
> would do for a knob)
> The electronic part is not so difficult to build, I think you can get the
> schematic on the web.
> Good luck
>
> David
>
>
> ------------------------------
> *De :* FernandoG <dataferx at gmail.com>
> *À :* pd-list at iem.at
> *Envoyé le :* Lun 20 septembre 2010, 17h 58min 29s
> *Objet :* [PD] piezo sensor to pduino object
>
> Hi
>
> I need to use a piezo to trigger a bang in a pd patch but i am having some
> problem of inestability. I use the piezo like an analog input to arduino
> board, then comunicate with pduino ( firmata 2.1.) Once in the patch i use
> an arduino object to detect the signal from piezo and a threshold object to
> trigger a bang when the value of the signal goes up the threshold. The
> problem is the acuraccy of the sistem, because is really unprecise,
> sometimes trigger doestn work and some times trigger more bangs than hits to
> the piezzo.
> Anybody knows a efficient way to do this? how can i improve the accuracy?
>
> Thanks ¡¡
>
>
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-- 
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