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 23:10:18 GMT
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Viewed:
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596 times
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In lugnet.robotics, "The WordMeister" <dwilcox@wordsmithdigital.com> writes:
> 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.
The problem you mentioned is not unique to the pendulum and ring arrangement,
but also happens with any tilt detection mechanisms, right? After all,
according to Einstein's theory of gravity, you cannot differentiate gravity
from acceleration...
> 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.
For the second approach, note that even after the robot starts/stops the
pendulum may continue swinging back and forth for a while.
Cheers,
Hao-yang Wang
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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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