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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Tue, 3 Mar 1998 14:31:30 GMT
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Original-From:
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ED Spike, E&CE Dept. <spike@eestaff.watstar%AvoidSpam%.uwaterloo.ca>
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Viewed:
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1451 times
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My $0.02
Transducers poled in sequence can us a count to four (or more) circuit/chip.
One digital output can be used to advance the count.
On Mon, 2 Mar 1998, Skye Legon wrote:
> > 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 | __/ __/ __/ __/ __/ |
> | 143 Columbia St. West, Unit E-4 | __/ __/ __/ ____/ __/ |
> | Waterloo Ontario CANADA N2L 3L2 | __/__/__/ __/__/\__/__/ |
> | +1(519)888-9249 | ______/ ___/ \___/ |
> | slegon@uwaterloo.ca | DC 2620, 888-4567 x5192 |
> +-----------------------------------------+----------------------------+
---------------------------------------------------------------------
Ed Spike
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Message has 1 Reply:
Message is in Reply To:
 | | Re: Sonar Multiplexor Question
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| (...) 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 (...) (27 years ago, 2-Mar-98, to lugnet.robotics.handyboard)
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