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Old 05-31-2007, 11:40 PM
Bolt Bolt is offline
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Join Date: Oct 2004
Location: Texas
Posts: 1,267
Default Linear Position Potentiometer Wiring

I have a gate that moves in a straight line along 200 foot of track.

I need to have some means of electronicaly knowing where the gate is, and running different controls off of it. I don't need anything accurate, just 10 foot increments or so.

For example:

If the gate is at the back (<70 feet), Relays 1-6 need to be energized.

If the gate is between 70 and 60 feet, 1-5 need to be hot.

If it's between 60 and 50 feet, 1-4 need to be on.

50 to 40 feet equals 1-3.

40 to 30 feet away, relays 1-2 are on.

30 feet or closer, just relay 1 is on. (I guess this wouldn't require a control then, as it would always be hot).

These are just some generalized descriptions, but I hope someone out there understands what I mean and what I'm trying to do.

I've found this site, and many others.

http://www.unimeasure.com/

But the part I am unsure about is getting the potentiometer's signal and processing it to run the relays. What do I need for such a task?

If it would help, I could probably get some drawings for you folks tommorow.

Or am I barking up the wrong tree here, is the cable pot the way to go, or maybe laser, or something else?
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