Got it... that would tie all the switches together.  I'll look into an isolated resistor network. Thanks.

Chris

On 3/21/07, Al < a.a.l@gmx.net> wrote:
A single resistor is a two terminal device so it would seem that using a
single resistor requires tying all the switches together at the remaining
resistor terminal (other terminal connected to supply for pull up). This
does not work. However multiple resistors can be found in a single package
with a common pin to supply connection for pull up.   Al



----- Original Message -----
From: "Chris Dollar" <chris.dollar@gmail.com>
To: <gumstix-users@lists.sourceforge.net>
Sent: Wednesday, March 21, 2007 2:47 PM
Subject: [Gumstix-users] shared pullup resistors


>I have 4 pushbutton switches wired to gpios on my breakout-gs, each
> with their own 10K pullup resistor (and working fine).  Could I rework
> this so that all 4 switches share 1 10K pullup?
>
> Thanks,
> Chris
>
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