Subject:
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Re: Sonar Multiplexor Question
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Mon, 2 Mar 1998 22:12:30 GMT
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Original-From:
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Skye Legon <slegon@watfast.uwaterloo=NoMoreSpam=.ca>
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Viewed:
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1432 times
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> To anyone on the list:
>
> I would like to drive 3-4 transducers from a single Polaroid
> sonar ranging unit. Adam Cox posted a circuit for doing this
> on the HandyBoard page -- I have a few questions regarding
> this and possible alternative solutions.
I notice that Adam's circuit uses all 4 available SCI outputs to select
the transducer, but the sonar board itself requires two of them already.
Why not just get a 2-to-4 line demultiplexor, and use the remaining 2
SCI outputs to select the transducer? (i.e. 00,01,10,11) If you can't
find one ('139 I believe) a demultiplexor can be easily made out of
a couple of NOT gates and a quad NAND gate (or quad AND if you need
active high outputs).
I have a question: why does Adam use open-collector NOT gates with
pull-up resistors? Why not just use a totem-pole chip? Any advantage?
Cheers, Skye.
+-----------------------------------------+----------------------------+
| Skye Legon | University of Waterloo |
| Systems Design Engineering | __/ __/ __/ __/ |
| Pattern Analysis & Machine Intelligence | __/ __/ __/ __/ __/ |
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| +1(519)888-9249 | ______/ ___/ \___/ |
| slegon@uwaterloo.ca | DC 2620, 888-4567 x5192 |
+-----------------------------------------+----------------------------+
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Message has 1 Reply:
Message is in Reply To:
 | | Re: Sonar Multiplexor Question
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| (...) Ive never done this before, but couldnt you do this? Buy a multiplexer that will take 2 outputs and multiplex it to 4 outputs, since you will only be driving one at a time. To each individual output of the multiplex, wire the power to one (...) (27 years ago, 2-Mar-98, to lugnet.robotics.handyboard)
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