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 <[email protected]> > 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 <[email protected]> > *À :* [email protected] > *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 ¡¡ > > > _______________________________________________ > [email protected] mailing list > UNSUBSCRIBE and account-management -> > http://lists.puredata.info/listinfo/pd-list > > -- Fagote / Contrafagote Bassoon / Contra-bassoon http://myspace.com/ricardolameiro
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