>> As you need it tiny, I suspect it may be practical to think
>> about making
>> your own LVDT sensor. If the travel is short enough then you
>> could probably
>> use a potcore winding former for the windings, and a ferrite
>> slug as the
>> moving element.


>That sounds interesting.  Can you describe a circuit and
>how to interface it to the PIC A/D?

I do not know a lot about the inner workings, but have a look at an
application note on this site.
http://www.anadigm.com/data-library.html and look for AN004, it explains the
theory quite well.

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