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Building a Home Security System with BeagleBone by Bill Pretty

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A geophone sensor

A geophone is a device that detects low frequency vibrations, like footsteps or a vehicle passing.

A geophone sensor

Geophone element (images are CC BY-NC-SA 3.0)

If you live in an area with heavy vehicle traffic, this project may not be for you.

A geophone sensor

Geophone detector block diagram

The previous figure shows the block diagram of a geophone sensor. What we do is we take the analog signal that comes from the geophone and amplify it so that we can detect footsteps. Then we pass it through a low-pass filter, which removes any high frequencies that might have gotten ...

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