Subject:
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Re: NXT BrickSorter - Sorting bricks with a HiTechnic colour sensor.
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Newsgroups:
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lugnet.robotics.nxt
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Date:
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Sun, 8 Apr 2007 00:43:38 GMT
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Viewed:
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19489 times
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In lugnet.robotics.nxt, Chris Phillips wrote:
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In lugnet.robotics.nxt, Dave Astolfo wrote:
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What better idea to come up with to test the HiTechnic colour sensor then to
build a LEGO brick sorter. So, that’s what I did. After quickly learning
that the sensor does not read colour from a distance (in my excitement I
forgot to read the documentation), and creating a room navigating robot (see
CT1 on my site), I decided to test its brick sorting abilities… Ok, the
sensor only has to tell the NXT what colour it sees, the robot has to do the
rest. Anyway, for details a video and more pictures, have a look at my site
at: www.plastibots.com
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Cool stuff, and a very elegant design. I was wondering if there is a reason
you don’t have cups all the way around the sorter? Have you tried to put the
color sensor inside a housing to cut down on ambient light? And the real
question the people want to know: can it tell the difference between Grey and
Bley?
I started building a brick sorter (sort by size, but colorblind) awhile back based on the RCX. I
barely got the caliper gearing worked out to give sufficient encoder
resolution to reliably distinguish certain block types, so identifying the
blocks without moving them anywhere was as far as I got at the time. I’ve
been thinking that an NXT-based solution would have much better resolution.
Combined with your color sorter, it could be a real timesaver!
Spotlighted!!
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Thx for the comments. The design as it stands right now would not allow the
sorter unit to rotate all the way around - not a bad idea though. I wanted to
challenge myself with the angle idea on the sorter itself (2 rows of cups). With
larger cups, it would be pretty much flawless (video shows 2 goofs). As for
colours - dont think it can tell the difference between gray and bley... The
video shows the 2 pink variations sorting to the same cup. However, I was using
the HiTechnic preset values 0-17... I imagine that if I put the sensor in a
sealed housing and used raw RGB readings, that it could detect the colours with
higher resolution...
Dave
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