There is a mechanical method..... have a slider above the buttons with a
hole large enough to expose only one button.... then only one button can be
pressed at a time.

Sorry couldn't resist

Steve

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
Rick
Sent: 26 March 2009 23:02
To: 'Microcontroller discussion list - Public.'
Subject: [PIC] Input algorithm advise

Looking for advice on a way to insure that only one of four push buttons is
active at one time. (IE - prevent multiple button press's) I have 4
pushbuttons
on Port A (16F88) and have AND'ed these bits out. The only idea that I've
tossed
around so far is to rotate the bits and count them.. If count = 1 then only
one
push button is selected. Is there a better way to do this?

Regards,

Rick

 


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