Just a thought, which I am yanking out of the muck of my memory...  I seem to
recall that ceramic disc capacitors can make a super cheap vibration sensor.  I
think it was for bearing monitors or something.  Also, you might craft a
 resonant
sound chamber in the molding of the housing of the product for the piezo souning
disc.  And if you don't use the PIC to oscillate the disc I'll be disapointed.
In other words, don't pay for the module with the oscillator that runs off of
DC.  Why would you add cost when the PIC can take up the job?

Chris Eddy
Pioneer Microsystems, Inc
www.nb.net/~ceddy

Peter Baines wrote:

> Hi all,
>         I know this is Way off topic but can anybody give me some pointers to
> cheap accelerometers. I have an idea for a personal alarm using say 16c84
> or sommit and a loud pizo sounder the accelerometer and a few push buttons.
>
> Oh BTW if anybody knows of any LOUD pizo sounders can you point me at them
> too
>
> Cheers Peter .........