> I need to sense the position of a steel wire in a cable (similar to the c=
ables of
> bicicles' brakes). It can be moved forth and back by 36mm.

What accuracy / resolution / repeatability, temperature range do you need.
What power is available if needed.
What manufacturing volume?

LVDT?

Linear single track (or multiple track) gray code encoder?.

Look at digital calipers.
In what way do these not meet your need?
(That will tell us a lot about what will and won't work).


        Russell


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