Subject:
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Re: Robotic Wheelchair
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Thu, 1 Jul 1999 18:52:37 GMT
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Original-From:
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Sean Verret <verret@ee(IHateSpam).ualberta.ca>
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Viewed:
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940 times
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Is anyone familiar with Fuzzy Logic - 'cause that's how they do it........
Gary Livick wrote:
> I did see that! Very impressive, as long as you don't run into an object
> below the CG while up on two wheels :-). They have probably thought of that
> already.
>
> This is the kind of good work that people in robotics can do. There are
> other "robots" in use already that help improve, and even preserve lives.
> There are implants for the inner ear that allow people who are stone deaf
> "hear." Devices are being developed that help people who are completely
> blind "see." Implants in the chest regulate heartbeats, and some even
> monitor for ventricular fibrilation, delivering a shock to get the heart
> beating properly if it happens. There are artificial limbs that users can
> consciously control, similar to a biological limb. Dr. Tonkens probably
> knows of other things either in use or in development that most of us have
> never heard of. If we put 1/10 the time and money into this kind of
> research that we put into cruise missiles, the world would be a better
> place.
>
> A couple of months ago, I was down at my local electronics supply house and
> I saw one of the clerks playing with a robotic device a friend of his had
> built. I haven't described it before now, because of the difficulty in
> doing so, but I'll take a shot at it.
>
> The robot was built around a basic stamp. It had an arm that it could spin
> in a horizontal plane around a vertical axis (picture a ball swung around in
> a circle from a string, but the string is rigid). At the distal end of this
> arm was mounted a rigid pendulum which could rotate about the axis of the
> arm. The pendulum arm had a weight on the end of it that kept the pendulum
> pointed down in when the robot was off. Both degrees of freedom of the
> device had rotary encoder feedback to the basic stamp.
>
> So picture yourself holding this thing in your hand. You hold the arm out
> straight, knowing if you wiggle it just right the penculum will start
> spinning around on the end like a single bladed propeller. There, I guess
> that is clear enough.
>
> The robot, when you turned it on, wiggled the arm and set the pendulum to
> swinging. After tfive or ten seconds, the robot would stop with the
> pendulum pointed straight up, perfectly balanced on the end of the arm.
> Everything was on needle bearings, so this was no easy task.
>
> Gary Livick
>
> rmtmd wrote:
>
> > Anybody catch the segment last night on the robotic wheelchair. I think
> > it was on Dateline.
> >
> > Watching it climb stairs was impressive, but seeing the chair stand
> > upright on two of its four wheels while the occupant caught a 25lb sack
> > of lead, all without the robotic chair even appearing to correct its
> > balance was amazing. The inventor must have one fast controller, lots of
> > accelerometers, and some very fancy code to do that!
> >
> > Ross M. Tonkens, M.D.
> > Medical Director
> > Primary Care of Nevada
> > 100 North Green Valley Parkway
> > Suite 240
> > Henderson, NV 89014
> >
> > 702 914-7120 VOICE
> > 702 914-7129 FAX
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Message is in Reply To:
 | | Re: Robotic Wheelchair
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| I did see that! Very impressive, as long as you don't run into an object below the CG while up on two wheels :-). They have probably thought of that already. This is the kind of good work that people in robotics can do. There are other "robots" in (...) (25 years ago, 1-Jul-99, to lugnet.robotics.handyboard)
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