Subject:
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Re: Tilt
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 1 Dec 1999 15:48:27 GMT
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Original-From:
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James Pritchard <PRITCHARD.JAMES@VIRGINnospam.NET>
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Viewed:
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432 times
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You could always program the bot to only respond to a sustained contact.
What kind of bot will it be used in, some kind of car that will stop if it
tries to climb a hill, or maybe a crane that stops when reaching a
particular angle?
James
----- Original Message -----
From: The WordMeister <dwilcox@wordsmithdigital.com>
To: Steve Hassenplug <SteveH@mailcode.com>; <lego-robotics@crynwr.com>
Sent: Wednesday, December 01, 1999 2:54 PM
Subject: Re: Tilt
> Old pinball machines do indeed use a pendulum and ring arrangement to • detect
> tilt. (They also have a ball on a track that rolls toward the back if the
> front of the machine is lifted up.)
>
> The only trick with constructing such with MindStorms (this is similar to
> the omnidirection bump sensor someone has built) would be that when a • mobile
> robot stops and starts, the inertia of the pendulum would cause it to • swing
> somewhat, and could cause accidental triggering. This could be overcome by
> making the pendulum (Is it a pendulum or a plumb bob if it has free • movement
> in two directions within the same plane?) far enough away from the ring to
> avoid such (but that would require a larger "tilt" to make it activate, or
> by adding code to the 'bot's program that turns off tilt detection during
> starts and stops.
>
> --Doug Wilcox
>
> WordSmith Digital Document Services
> 403 VFW Drive
> Rockland, MA 02370
>
> 781-871-6162
> fax 781-871-6264
> http://www.wordsmithdigital.com
> ICQ# 24868783
>
> - Web design (including e-commerce)
> - Searchable Digital Documents on CD
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> - Officially Registered in Dogbert's New Ruling Class
> -----Original Message-----
> From: Steve Hassenplug <SteveH@mailcode.com>
> To: lego-robotics@crynwr.com <lego-robotics@crynwr.com>
> Date: Wednesday, December 01, 1999 9:08 AM
> Subject: RE: Tilt
>
>
> > Another solution for detecting tilt would be the kind of tilt device used • in
> > old pinball machines (I don't know if it's still used). I'm not sure how • to
> > explain it, but I can give you a similar example:
> >
> > Hold a pencil at the end between your index finger and thumb, so the • pencil
> > hangs down (and can swing a bit). Now take your other hand and make a
> > circle with your index finger and thumb. Hold this around the pencil • near
> > the bottom. If your hands were connected together, you could detect when
> > they 'tilted' by detecting when the pencil touches your bottom hand.
> >
> > If you turn the pencil into a metal rod, and your bottom hand into a • metal
> > ring, and attach wires to both, you have a simple switch to detect tilt
> > (with some other hardware connecting the two).
> >
> > This would eliminate the need to use some pesky toxic chemical, and • should
> > be fairly easy to implement using mostly lego parts.
> >
> > If you want, the pendulum could be replaced with one that moves on a • single
> > plane and pushes a touch switch when it tilts (one switch for each • direction
> > you want to detect)
> >
> > I hope this makes sense.
> >
> > </steve>
> >
> >
>
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Message is in Reply To:
 | | Re: Tilt
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| Old pinball machines do indeed use a pendulum and ring arrangement to detect tilt. (They also have a ball on a track that rolls toward the back if the front of the machine is lifted up.) The only trick with constructing such with MindStorms (this is (...) (25 years ago, 1-Dec-99, to lugnet.robotics)
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