Subject:
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Nevermind Squared...
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 6 Oct 1998 14:35:14 GMT
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Original-From:
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GDFRITZ@stopspamAOL.COM
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Viewed:
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948 times
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Ok, after reading it for the nth time, I think I understand this statement
now:
<<The normally open case means that the sensor line is pulled high by the 47K
resistor on the Handy Board. The standard software for reading the state of a
switch interprets this logic high value as ``not pressed'' or false. When the
switch is closed, the sensor line is connected to ground, and the software
reads a logic low value, which is interpreted as ``pressed'' or true. >>
I've heard the term Pull-up resistor before and didn't understand it. I've
only had 1 electronics course (yrs ago) and am just a little confused as to
which direction current is pulled, or how you pull current. (+ to -?)
I'll stop talking now...and hit the books some more. Sorry for the wasted
bandwidth!
Gerald.
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