[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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