>I'm building a device to count the frequency an object strikes on, or
rests
>on, a surface. I need a sensor that will sense the mechanical impact or
when
>an instantaneous or prolonged pressure is applied on it. However, I want
>this sensor to work on its own without requiring any electrical power
>supply. Moreover, I want the sensor to give a voltage or current when it
>senses the event, the signal could just be instantaneous but must be
strong
>enough to be used as an input to the i/o port of an ordinary
microprocessor.
>Is this kind of "sensor", or more precisely, "pressure to volatge
converter"
>available?

Yes, this kind of sensor exist. It's piezocrystal.
The same is used in the toys and watches instead speaker.
It deformate when electricity is applied and vice versa when pressure is
applied generate electricity.

Best regards
Tsvetan
---
PCB prototypes for $26 at http://run.to/pcb

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