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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Sat, 2 Jan 1999 00:53:29 GMT
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Original-From:
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Ron Beck <rtb@richmond.infiAVOIDSPAM.net>
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Viewed:
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1262 times
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> 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
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