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 14:47:05 GMT
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Original-From:
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Jim West <jim@jameswest.^IHateSpam^com>
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Viewed:
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1797 times
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Ok, here's another idea.
I just ordered my first rotation sensor...and note that I do not know the
details of this sensor yet.
Would it be possible to attach a pendulum to the rotation sensor and use it
to measure the amount of angle?
If so, you wouldn't need a switch.
Ok...just thinking out loud again... :)
At 07:24 AM 12/01/1999 -0700, Jim West wrote:
> At 09:08 AM 12/01/1999 -0500, Steve Hassenplug wrote:
> > 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:
>
>
> As one who collects pinball machines (I have 10 now), you are refering
> to a plumb-bob tilt mechanism that is in use on the newer pins.
>
>
> > 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).
>
> Right. There is a metal rod to which the plumb-bob is attached (a
> solid metal cone shaped item) and a metal ring. You can adjust the
> height of the plumb-bob with relation to the ring to change the
> sensitivity of the "tilt". BTW, the plumb-bob is inverted, i.e. the
> point sticks down. The lower the plumb-bob the less gap between the ring
> and the plumb-bob and thus more sensitive to tilt.
>
>
> > 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.
>
> On the pins from the 80's the tilt device was a pinball on a track
> mounted to the side of the cabinet. This track was mounted at an angle
> so that the steel ball would sit at one end. At the other end of this
> track is a "roll over" switch. If the pin was either shoved too hard or
> lifted up from the front the ball would roll to the other end of this
> track, roll over the switch and BAM!, you'd get a tilt.
>
> I would think that this approach would actually work a bit better. Use
> a marble that is heavy enough to engage a touch sensor and build a track
> that the marble/steel ball can ride in/on with the touch sensor at the
> other end.
>
> The real problem with the plumb-bob tilt (from my experience with my
> pins) is that too much jostling (sp) would cause the plumb-bob to hit the ring.
>
> If the pendulum one moved in a single plane, you'd want to make sure
> that the movement of the bot wouldn't cause an "erroneous" tilt.
>
>
>
> > </steve>
>
>
> Jim West
> NIC Team Lead
> NIC Oracle Developer and DBA in Training
> NIC Chief Cook and Bottle Washer
> MCI Worldcom
Jim West
LEGO@jameswest.com
LUGNET Member 63
LEGO Rulez!
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Message has 1 Reply:
 | | Re: Tilt
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| I was considering the same thing; there are a few advantages of using rotation sensors: - They would measure all degrees of tilt, but any circuit interrupted type (touch sensor, rod & ring, etc.) will only sense a single angle. - They could sense (...) (27 years ago, 1-Dec-99, to lugnet.robotics)
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