Subject:
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Re: YAWAI - Yet another Wild -*** idea. (Another sensor type)
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 4 Jan 1999 21:06:09 GMT
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Original-From:
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Peter Hesketh <pbh@phesk.demon.SPAMLESSco.uk>
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Viewed:
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1350 times
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In article <368D6E09.48D@richmond.infi.net>, Ron Beck
<rtb@richmond.infi.net> writes
> > Robert Kenyon wrote:
> > >
> > > Does anyone have any of those ultrasonic range sensors? (like out of an old
> > > Polaroid camera?). I'd expect it to be reasonably easy to use this to
> > > detect distance to an object. These have become pretty accurate recently
> > > and could be used to evaluate relative movement.
>
> Zachary Bourk wrote:
> >
> > I'm in San Diego, CALIFORNIA. We have a Brookstone that has "ultrasonic
> > tape measures" that output a digital signal to a panel on the front of
> > them. They are about the size of a CellPhone battery
>
>
> Those sensors are available at most hardware stores these days. They
> can be hard to hack, since they are tightly coupled with an ASIC that
> does the trigger/timing and drives the display. Poloroid released a
> developers kit that might still be available. I was seeing adverts in
> Circuit Cellar Ink a few years ago.
>
> The leader of our robot group put one of the kits together on an Apple
> ][ platform. It had decent resolution ... 0.1' in the 1.5' to 12.0'
> range. Closer than 1.5' and the echo gets swamped by the triggering
> pulse. BEWARE if you hack a hardware store sensor. The pulse to fire
> the transducer is about 90VDC from a killer cap. If you discharge this
> to your body you could wind up on the other side of the room. Maybe
> awake, maybe not.
> --
> Did you check the web site first?: http://www.crynwr.com/lego-robotics
There was a good description of a hack of the Radioshack Electronic
Ruler in comp.robotics.misc in Sept 98, message-ID <360EF3EE.B57F193C@be
llsouth.net>, and may be available from Deja View.
I would repost it here but I don't know whether netiquette-wise one
should repost other people's posts into different groups.
--
Regards - Peter Hesketh, Mynyddbach, Mon.
Forty reasons why a dog is better than a woman: number 16
"Dogs like it when you leave lots of things on the floor."
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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