Subject:
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Re: 100 sensors
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Thu, 16 Jan 1997 09:34:22 GMT
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Original-From:
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Richard Whitehead <Richard.Whitehead@ukos.^spamcake^varian.com>
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Viewed:
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1525 times
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Joe,
A very handy way to connect lots of digital switches is to arrange
them in a resistor ladder and connect them into an analog input.
You could get up to 8 switches into one input, giving you 256
different voltage levels, in theory, but in practice 6 or 7 is more
realistic without a lot of precision resistors.
This means you need 16 analog inputs. You could use a couple of 1:8
analog multiplexers to connect them all into 2 analog inputs on the
HB.
Maybe put a slow counter circuit on the multiplexer address lines, and
input this to the digital inputs so you know which switches you are
looking at at any one time.
Hope this helps.
Richard
______________________________ Reply Separator
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Subject: 100 sensors
Author: Joe Martin <Joema@mpx.com.au> at Internet-Mail
Date: 16/01/97 04:04
I am interested in sensing with about 100 water activated switches and am
wondering if this is at all possible with the Handy Board.I had thought
that it might be possible to by making them all return different levels of
current at the sensor input I could make them register as different values
to the handy board.Is this so or are there any other suggestions.
Thank you,
Joe Martin
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Message has 1 Reply:
 | | Re: 100 sensors
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| What's a resitor ladder? Is there a textbook or something where I can get a schematic? Is is same as a D-A converter? ---...--- ericson mar Master of Engineering Candidate Project: Mobile Robotics mar@cooper.edu (212)353-4356 Department of (...) (28 years ago, 12-Mar-97, to lugnet.robotics.handyboard)
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