varible knob for input

Nick · Guest

i need to get input from a knob, this knob needs to keep its position even when turned off and back on.

maybe a pot attached to a analog line?

Nick

dyeatman · Joined: 06 Sep 2003 Posts: 1938 Location: Norman, OK

Sounds like the teacher assigned this project again this year....

This has been covered in this forum before. Search on the word "pot"

Guest · Posted: Sun Mar 06, 2005 6:53 pm

i did to a search and i found my old post from a few months ago, but didnt seem like i got a straight answer.

btw i'm not in school.

Nick

dyeatman · Joined: 06 Sep 2003 Posts: 1938 Location: Norman, OK

OK then, when you post something like this you need to give sufficient info to work with. Can you give some more information about the following:

1. what version of compiler are you using?
2. What PIC are you using?
3. can you describe the application and how the pot is intended to work?

Mark · Joined: 07 Sep 2003 Posts: 2838 Location: Atlanta, GA

How about asking a question? You made a couple of statements and a viable solution. What else are you looking for? Alternatives? What you have posted is probably the easiest. I don't think you want to go the route with an encoder.

Nick · Guest

sounds good, I just wanted to know if it was a viable solution.

Nick

SherpaDoug · Joined: 07 Sep 2003 Posts: 1640 Location: Cape Cod Mass USA

There are "absolute" position encoders that give you a 3 or 4 bit indication of their current position. For very large $$$ you might be able to buy an 8 bit absolute encoder, but I have never seen one.
For almost all applications the pot and A/D is the way to go.
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sseidman · Joined: 14 Mar 2005 Posts: 159