A cheap pressure sensor can be made from conductive foam. Sandwich the
conductive foam between two sheets of copper foil. Solder a wire to each
sheet of copper. It works just like a variable resistor:  when pressure is
applied the resistance between the two plates decreases. You will probably
need to experiment with it to find the amount of pressure associated with
the resistance change.

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Michael A. Powers
Sent: Wednesday, August 14, 2002 10:25 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: [EE]: Mechanical Force Transducers


Hello,

I have an application that requires the use of a mechanical force
transducer.  Basically, I want to know the force that one flat surface
imparts upon another.  Does anyone know of a cheap sensor that can be bought
(or easily made) that is appropriate?  I saw some pressure sensors in
Jameco's catalog, but they appeared to be gas pressure sensors and wouldn't
be applicable here, or would they?

Thanks,
-Mike

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