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 00:03:55 GMT
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Original-From:
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MAR ERICSON <MAR@COOPER.avoidspamEDU>
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Viewed:
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1411 times
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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 these two outputs to drive the Polaroid Sonar.
If I remeber correctly, Adam Cox has done just this to get 4 sonars
working with the HB!
About the damage thing...the damage is done when you connect NO sonar to
the ranger. Also, the ranger can be damaged only when it tries to FIRE a
transducer when there is none connected to it. Thus, the brief moment
you're talking about will expire prior to your attempt to fire the
transducer anyway.
In addition, I don't beleive anyone has yet reported that they damaged
their ranger this way. If anyone has believed they damaged their ranger by
not connecting a transducer to it, please correct me.
-----------
ericson mar
Master of Engineering Candidate
Project: Mobile Robotics
mar@cooper.edu
(212)353-4356
Department of Mechanical Engineering
The Cooper Union for the Advancement of Science and Art
-------------------------------------------------------
On Mon, 2 Mar 1998, Stephen Michael 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.
>
> 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 is in Reply To:
 | | Sonar Multiplexor Question
|
| 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 (...) (27 years ago, 2-Mar-98, to lugnet.robotics.handyboard)
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