> I am looking for a sensor that can be used with a pic that will measure
> tension. I thought about a spring and a pot but that leads to a lot of
uncertainty
> when it comes to accuracy.  Has anyone used such devices or know of a
> reasonable source for such a sensor?

If there isn't much travel you might consider gluing a small rare earth
magnet on a leaf spring.  You can measure the deflection of the spring with
a Hall effect transistor.  It's awkward to calibrate but quite reproducible
once you've done it.

Win Wiencke

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