Subject:
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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 15:18:09 GMT
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Viewed:
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11759 times
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Hi all,
I am working on a "project" where I want to measure some reasonably small
rotations, things on the order of +/- 10 degrees or less. Just to make it hard,
the force acting on the thing being rotated is small, like, completely
hypothetically, the mass of, say, a Lego soccer ball on the end of a 16-stud
beam. So, imagine I have, say, a 32-stud length teeter-totter (You know, I
don't think I've ever typed that word before!) and at the fulcrum I have an axle
and I place a ball at the end so that the teeter-totter (there it is again)
tilts. I want to measure the rotation.
I tried using one of the NXT motors but it takes too much force to move the
axle. If I increase the force (torque?) through gearing it up (down?) then
there is too much slippage, the gears are too loose, and it doesn't register.
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.
Any thoughts?
Thank you,
Rafe
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Message has 3 Replies:
 | | 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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