Subject:
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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 15:58:05 GMT
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Original-From:
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Stephen Michael <STEPHEN.MICHAEL@nomorespamMCI.COM>
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Reply-To:
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STEPHEN.MICHAEL@MCInomorespam.COM
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Viewed:
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1660 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.
Has anyone implemented this or some other sonar multiplexor
on the HandyBoard? Any feedback?
Also, in Adam Cox's solution, there is a note to the effect
that, to avoid damage to the Ranging Unit, a single transducer
must always be switched into the circuit. Does this mean that,
while transitioning between transducers, that two transducers
will be switched into the circuit (if only for a brief moment)?
Also, if I read this correctly, Adam Cox's solution will take
four additional digital outputs (in addition to two already
needed to interface the HandyBoard to the Polaroid ranging
unit). It looks like a prerequisite for implementing this
solution will be to expand the # of HandyBoard digital outputs.
Does anyone have a sonar-multiplexor solution that doesn't
take up so many additional digital outputs?
Any suggestions or feedback will be greatly appreciated.
The URL for the multiplexor is:
http://lcs.www.media.mit.edu/groups/el/Projects/handy-board/software/contrib/adam/mxducr1.gif
Thank you!
Stephen Michael
-----------------------
Stephen.Michael@mci.com
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Message has 1 Reply:
 | | Re: Sonar Multiplexor Question
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| You get 4 SPI output digital ports in the HB. Read the section in the FAQ about the HB's digital outputs. These 4 can be used to select your transducer. You can pull one motor driver chip and get 2 more digital outputs. Kent has routines that uses (...) (27 years ago, 3-Mar-98, to lugnet.robotics.handyboard)
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