>
> On Wed, 24 Sep 1997, Peter Baines wrote:
>
> > Firstly "Thanks to all who responded to this thread so far" Your Ideas have
> > been an insperation. In fact I have now concluded that I probab;y don't
> > actualy require an Accelerometer but a 3 DOF movment detector, I am trying
> > to build a small device that I can attach to my snowboard that will sound a
> > LOUD alarm if anybody tries to "Borrow" it without my permission. It will
> > have a small keypad to arm/dis-arm it and must be about the size if a
> > ciggarett packet. it will run of a 9V battery. I have most of the keypad
> > and I/P O/P code sorted so far it's based on a 16c84. So if anybody has any
> > ideas on motion dectection please let me know. It dosent have to be linear
> > just digital will do. IE motion /no motion but the sensivtivity must be
> > quite good.
> >

Pasi Mustalahti wrote:

> PTM: Make a small cage of wires that are insulated of each other. Three
> wires should be enough. Connect the to a sounder. Put a metal ball in the
> cage. When you move the cage, the ball rolls and makes new connections.
>
You can buy this type of tilt switch at many discount parts
distributors.  Check out: http://www.allcorp.com/sw008.html#TILT
This is the All Ecectronics web page.  They sell this switch
for 50 cents.  I think Marlin P. Jones also carries this switch
but it is only in their catalog not on their web page:
http://www.mpja.com/

Keith

Keith D. Kotay
Ph.D. Candidate
Dartmouth College
kotay@cs.dartmouth.edu
http://www.cs.dartmouth.edu/~kotay