Subject:
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Re: Any experience with measuring rotations?
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Newsgroups:
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lugnet.robotics.nxt
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Date:
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Sat, 20 Jan 2007 22:55:45 GMT
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Viewed:
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11328 times
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In lugnet.robotics.nxt, Rafe Donahue wrote:
> > > So, I guess I need a force sensor, ie, an NXT scale
Well... there's two things here, and Steve solution actually addresses them
both. Do you actually need a continual series of states, and the "weight" of the
thing on the end of the beam, or just know if something *is* on the end of the
beam? I'm either case Steve's solution will work, and it works very well. I used
a copy of Steve's sensor for a wall-follower and loved the application so much
I've found it popping up all over (I used it as a "forceless" feeler in my 3T
machine, and it will actually function just fine to count single soccer balls as
they roll past on a very modest slope - it can be made that low a force level).
> I'm thinking I'm going to have to work out a
> sequence of more than just two shades
I've done this using black, two greys, and white, and using the two rows of
white 1x1 dots edge-on to get a "calibrated non-linear" scale... but for most
things, Steve's (again) correct, just use the very slight motion between one
white and one black object, and scale the motion of the transition to the motion
you want to detect.
> Can you say Posterior Bayes Estimate?
No. And even after some quick Wiki-ing, I still have no idea. However, I'm
trying to push the bi-stable flip-flops to new heights of sillyness. Counters,
clockers, triggerable delay gates.... but for the life of my I can't figure out
a (practical!) series of async logic gates (well, that *do* anything specific
anyway).
--
Brian Davis
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Message has 1 Reply:
 | | Re: Any experience with measuring rotations?
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| (...) What I need to do compute the average position of a number of items across the length of the teeter-totter (!). If, on average, they are in the middle, then there is no rotation and I should get zero. If there are more on the left than the (...) (18 years ago, 21-Jan-07, to lugnet.robotics.nxt)
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Message is in Reply To:
| | Re: Any experience with measuring rotations?
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| (...) "It's foolproof!" (...) This sounds like a good idea. I'm thinking I'm going to have to work out a sequence of more than just two shades, but that's what weekends are for, right? So, if I could make of sequence of colors that have increasing (...) (18 years ago, 20-Jan-07, to lugnet.robotics.nxt)
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Active threads in NXT programmable brick
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