[simpits-tech] Using Pots for position sensing (part 2)

[Rick Davis]

Roy,

Assuming you are only using two of the pots connectors (one being the 
wiper), you will only have an increase if you turn it down past the 100k 
position on the track. (partial rotation).

I don't know what you application is, but I can't imagine it being a problem 
current-wise in any case. We are talking small (5 volt) pressure here aren't 
we?

Rick

----- Original Message ----- 
From: "Roy Coates" <roy at flightlab.liv.ac.uk>
To: <simpits-tech at simpits.org>
Sent: Thursday, December 04, 2008 10:24 AM
Subject: [simpits-tech] Using Pots for position sensing (part 2)


>
>
> Using regular pots for poisition sensing is cheap and easy to do but there
> is a problem in obtaining the full rotation (270 deg ?) of the pot unless
> you build something like a gearbox or rack and pinion type affair.
>
> I had a cunning plan... because I'm using the circuit boards from some
> Logitech sticks, I wanted to get a 0 -> 100k reading from my pots without
> having to jump through hoops to get the full rotation. My cunning plan was
> to use 470k pots so that I only needed a partial rotation to get the
> desired resitance.
>
> But... wouldn't this draw additional current from the interface?
>
> I'm having trouble getting my head around this today so wanted some other
> (better) heads to consider it!!
>
> Thanks,
>
> Roy.
>
>
> --
>
> Roy Coates.
> Dept of Engineering.
> Liverpool University.
> E-Mail: r.coates at liv.ac.uk
> Tel: 0151 794 4862
> -------------------------------------------------------------------------------
> Lord, If I must have an instrument failure, please let it be the Hobbs 
> meter.
> -------------------------------------------------------------------------------
>
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