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 19:11:56 GMT
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Viewed:
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11276 times
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In lugnet.robotics.nxt, Steve Hassenplug wrote:
> > So, I guess I need a force sensor, ie, an NXT scale, but something more
> > than
> > just the binary on/off of a (not sensitive enough) touch sensor.
>
> Easy. A light sensor.
"It's foolproof!"
> Point the sensor at a disk that's shaded from white to black. I've used
> that to detect the distance a robot is from a wall (wall following), using
> just a black & a white dot (1x1) which are moved in front of the sensor. It
> shows black, white, & gray.
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 "darkness", I
could use that level to determine the force!
> It uses very little force, and doesn't lose counts (like a rotation sensor
> could).
>
> Is this for something we could see at BrickWorld? I hope so. :)
Yes, that would be the plan! Can you say Posterior Bayes Estimate?
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Message has 3 Replies:
 | | Re: Any experience with measuring rotations?
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| (...) Don't mess with colors. Just use a gradient. You'll have a mostly linear set of values. With my black & white studs, there are also several shades of gray in between (like a little black & mostly white...) (...) no. :) Steve (18 years ago, 20-Jan-07, to lugnet.robotics.nxt)
| | | Re: Any experience with measuring rotations?
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| (...) 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? (...) (18 years ago, 20-Jan-07, to lugnet.robotics.nxt)
| | | Re: Any experience with measuring rotations?
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| (...) Well put quite simply... The probability of some event A occurring given that event B has occurred is equal to the probability of event B occurring given that event A has occurred, multiplied by the probability of event A occurring and divided (...) (18 years ago, 21-Jan-07, to lugnet.robotics.nxt, FTX)
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Message is in Reply To:
| | Re: Any experience with measuring rotations?
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| (...) Easy. A light sensor. Point the sensor at a disk that's shaded from white to black. I've used that to detect the distance a robot is from a wall (wall following), using just a black & a white dot (1x1) which are moved in front of the sensor. (...) (18 years ago, 20-Jan-07, to lugnet.robotics.nxt)
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