Subject:
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Re: Sonar and RF Modem questions
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 17 Feb 1999 14:26:45 GMT
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Original-From:
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Tom Brusehaver <tgb@cozy.wamnet.SAYNOTOSPAMcom>
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Reply-To:
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tgb@wamnet.*NoMoreSpam*com
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Viewed:
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865 times
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> 1) Is everybody adding the 100uf 16 volt capacitor to prevent
> power dips (per http://www.robotics.com/arobot/sonar.html)?
> I have to wonder why wirz doesn't ship the boards with
> this peice or even recommend it on their web site or in
> their documentation. Any opinions would be appreciated.
I am using the expander board, and no, I don't have any extra caps.
>
> 2) I like the "cap" around the transducer as illustrated in
> this picture of the "RadStamp"
>
> http://www.milinst.demon.co.uk/radar.htm
>
> Does anyone know where I can get such a cap, or what
> other (plumbing?) materials you are using?
It looks like a PVC coupler, maybe cut in half. Could be an end cap,
but then there would have to be foam inside to prevent ringing. These
can be purchased at many hardware and most home care stores.
> 3) I also like how the RadStamp attaches the transducer to
> a stepper motor. Any recommendations on an appropriate
> motor for such an application, to be driven by the
> HB expansion servo control outputs? Would a standard
> R/C servo work for this, or do I need a special stepper
> motor (or is there a difference in these terms).
I have mine on a servo. If you look on this page (second picture
down), you can almost tell. Look for where the white ribbon cable
goes.
<http://www.webconn.com/tcrobots/oct1997/oct1997.html>
On my robot, The sonar cannot turn 360degrees, so having it scan 90 in
front works well.
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Message is in Reply To:
 | | Sonar and RF Modem questions
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| HB fans, A few questions for ya ... I just received my polaroid 6500 sonar module from wirz. Cool little gadget. I have the HB expansion board from gleason. Installation looks pretty straightforward with the expansion board, since the pins on the (...) (25 years ago, 17-Feb-99, to lugnet.robotics.handyboard)
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