Subject:
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Re: All-around-the-robot bump detection
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Newsgroups:
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lugnet.robotics
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Date:
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Sun, 20 Dec 1998 03:16:06 GMT
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Original-From:
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bertalan <bertalan@^StopSpam^ix.netcom.com>
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Viewed:
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1215 times
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to Dennis Parker's point
OK so you get this tube wired up to act as a switch. What's the energy drain on
your batteries? What are the voltages required to exceed the limit value of the
actuator? It sounds more accurate than an air filled tube described below by
Michael. Also, with a simple air filled tube, deformation of the tube may
negate the desired effect of the impact unless the tube is backed up by a rigid
substrate to allow the only action to be the compression of the tube.
Thoughts?
JB
Kerry Garrison wrote:
> There is an example on the net somewhere of building it just like this using
> the bend sensors ripped out of a Mattel PowerGlove.
> -Kerry
>
> -----Original Message-----
> From: Dennis Parker [mailto:dparker@onr.com]
> Sent: Friday, December 18, 1998 6:55 AM
> To: lego-robotics@crynwr.com
> Subject: Re: All-around-the-robot bump detection
>
> How 'bout this as an alternative. A flexable containment, possibly the
> moderate diameter rubber tube, inside which are two circuits. One is a
> continuous metal strip which runs along the inside edge of the outside
> wall of the tube. The second is a similar strip, but this one is broken
> into a series of sections, each seperated by a resistor. Voltage is
> applied to one end of one or the other of these circuits (doesn't matter
> which) and voltage is read from the opposite end of the other one. When
> a bump happens, voltage will be present at the output at a level which
> is indicative of the location of the bump.
>
> Comments?
>
> "Fredrik Glöckner" wrote:
> >
> > "Michael Gasperi" <gasperi@alynk.com> writes:
> >
> > > Wrap soft rubber tubing around the robot, seal one end of the tube,
> > > and connect the other to a pneumatic cylinder. Have the cylinder
> > > push on a touch switch just short of turning it on. When the robot
> > > bumps something the pressure in the tube goes up enough to push the
> > > switch.
> >
> > I haven't actually tried this, but I can hardly imagine that the
> > pressure generated from just squeezing one small part of the tube is
> > sufficient to extend a cylinder and press a touch sensor. The pressure
> > generated will probably just "vanish" in the rest of the tube.
> >
> > In normal pneumatic operation, several pushes on a pump is normally
> > needed to extend a large pneumatic sylinder.
> >
> > Fredrik
> > --
> > If you reply to this article, please do not Cc: it to me in the mail.
> > It suffices to send it to the mailinglist or the newsgroup.
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Message is in Reply To:
 | | RE: All-around-the-robot bump detection
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| There is an example on the net somewhere of building it just like this using the bend sensors ripped out of a Mattel PowerGlove. -Kerry -----Original Message----- From: Dennis Parker [mailto:dparker@onr.com] Sent: Friday, December 18, 1998 6:55 AM (...) (26 years ago, 19-Dec-98, to lugnet.robotics)
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