Subject:
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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 09:53:47 GMT
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Original-From:
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doug@knowpeace.ANTISPAMcom
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Viewed:
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909 times
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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 cable connector only fit one
way onto the board, and the contact side of the ribbon cable
is obvious. But ...
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.
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?
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).
4) I want to hook up RF transcievers to the handy board
and my laptop for wireless RS232 comms. I have been
researching this and am quite confused. There seems
to be quite a few options.
- I have had recommendations for SIMA from pontech
(http://www.pontech.com/PRODUCTS/sima/index.htm)
but it looks so big, it's unclear how big the
remote module is or what it looks like.
- I have also looked at the Linx Technologies site
(http://www.linxtechnologies.com/f_modules.html)
but I'm not sure which module would be the best
choice for the HB or how difficult it would be
to interface the module.
Does anyone have wireless comms setup, and if so
what parts/configuration did you use? I would
greatly appreciate recommendations for a pair of
RF transcievers. Parimary goal is to control the
board from host PC via serial link, but I would
also like to be able to communicate between two
handy boards via wireless serial link. Any ideas?
Thanks,
Doug
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Message has 3 Replies:
 | | Re: Sonar and RF Modem questions
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| (...) I am using the expander board, and no, I don't have any extra caps. (...) 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 (...) (25 years ago, 17-Feb-99, to lugnet.robotics.handyboard)
| | | Re: Sonar and RF Modem questions
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| (...) <snip> (...) standard battery source ... but since I was soldering on the Polaroid board anyway, I decided that it wouldn't hurt to add it. Do be *sure* to add the 0.1 uF cap at C7 as per: (URL) (...) Since most of my constructions are LEGO (...) (25 years ago, 17-Feb-99, to lugnet.robotics.handyboard)
| | | Re: Sonar and RF Modem questions
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| (...) <snip> (...) I just took a look at the Linx site, and while perusing the fine print at the end of the price list came across this: "Linx requires the purchase of an evaluation kit prior to the sale of individual modules to any customer. This (...) (25 years ago, 17-Feb-99, to lugnet.robotics.handyboard)
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