Piezo sensor amplification

Jan 04, 2008 2 Replies

Hi,



Happy new stuff to you all...



After examining my car during the week I've found a few new paint chips in the doors, and strange tyre marks on the back bumper.



I'd really like to forgive the people who did this - obviously there was a mad rush to return faulty Xmas gifts and some people felt the need to kick open their doors to expedite a quicker run to the claims department... To quote from someone 'God forgives...'.. Well just now I'd like to find these fine people and nail their out-of-control limbs to something appropriate :-)



Anyway, this led me to thinking of a bump sensor, and although there was a circuit published in SC

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I was thinking of a circuit that would use a purpose-built IC to amplify a piezoelectric sensor and interface the output to a microcontroller which would take the appropriate action ie. trigger an alarm, camera, fire a harpoon etc...



Anyone seen anything like this around or know where I should start looking?



Cheers, Phil.


Any idea what piezo sensor was used in that article?

I'm interested in building one up.

JERD

Well, I'm not sure what the sensor is Jerd, but I'm thinking it something like this (hacked)

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or
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or maybe a gift card piezo speaker (not that I've found one yet).

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