On Thu, 2003-03-13 at 19:28, carlosmarcano78@cantv.net wrote:
>    Thanks for all your suggestions. I have given a look to all of them and
> I think I have got with something. Optical solutions aren4t suitable
> because of all the dirt and dust from the mineral in the ambience where the
> belt is. I think that Jhon4s idea, using a couple of linear pot with some
> kind of mechanical contact with the belt is the best way to go. Does
> anybody know of a manufacturer of this kind of pots or accesories for them?
> I think they must be of a very robust type so they could work through the
> effort.

Instead of a linear potentiometer, you might want to consider using an
LVDT (linear variable differential transformer). They're not cheap but
they're pretty robust. Some of them have the signal conditioning
circuitry built in, so you just supply it with power and it produces a
linear DC voltage indicating the shaft position.

--
------------ Alex Holden - http://www.linuxhacker.org ------------
If it doesn't work, you're not hitting it with a big enough hammer

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