[PD-ot] piezo-electric sensors
B. Bogart
ben at ekran.org
Tue Jan 8 20:09:21 CET 2008
Hi Patrice,
Why not just use a microswitch if your just measuring the moment of
contact for all the balls? Should be easy enough to find one with a
spring strong enough for your application.
.b.
Patrice Colet wrote:
> Hello, I'm trying to build a system for getting impulses from bouncing
> balls on a medium board, for driving sounds or a step sequencer.
>
> The cheapest solution was about using a piezo-electric disc, that
> transform the mecanic impulsion into electrical energy. So I use the
> analog input of the Arduino interface for receiving this energy amount,
> and then I just have to choose a threshold level of the released energy,
> for triggering into PureData.
>
> But the problem I'm encountering is that the electrical circuit made
> by the piezo probe and the arduino, with no other additionnal component
> has a too high capacitance, so the energy level is lowering too slowly
> after each mecanical impulsion, then my system doesn't trig anymore
> until the circuit capacitance goes below the threshold level set in
> PureData.
>
> There certainly is an electronical trick for discharging the energy
> just after each impulse, maybe someone that read this message has
> sufficient skills in electronics to help?
>
> Thanks,
>
> pk.
>
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