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We have had similar issues.  The only thing I have noticed is that it is more pronounced when the battery is 100% charged and tends to even out after a few runs.  It's still very frustrating.

-Frank


On Fri, Nov 14, 2014 at 10:40 AM, Neelam Kadam <[log in to unmask]> wrote:
Our team's robot is well balanced for the most part but has a couple more pieces on the left side. It has two large motors driving the two wheels. When testing it to see how straight it goes, it was veering slightly to the right consistently. We just switched the ports to which the two motors are connected and now it is going straight. Can anyone explain what might be the reason?

Thanks
Neelam



On Tue, Nov 11, 2014 at 7:55 AM, Neelam Kadam <[log in to unmask]> wrote:
Thanks! That is a great idea! We were thinking of doing it indirectly by moving into the "zone" past the other lines using rotations and then start the sensing but your way is much simpler.

On Tue, Nov 11, 2014 at 7:52 AM, Anant Narayanan <[log in to unmask]> wrote:
You can use the motor rotation sensor to restrict comparison analysis to "in zone"

If B Motor Rotations are between x and y AND color is GREEN  or YELLOW, etc.

Good luck.

Anant Narayanan

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Anant S Narayanan
Founder & Executive Director

McLean Robotics Institute
McLean VA 22102
202-421-3826 (cell)
[log in to unmask]

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On Tue, Nov 11, 2014 at 7:49 AM, Neelam Kadam <[log in to unmask]> wrote:
That is what we do to get around the problem. But does not always work because of other color lines in the way.

On Tue, Nov 11, 2014 at 7:46 AM, Anant Narayanan <[log in to unmask]> wrote:
One of our teams faced this problem at the competition, but didn't take an extra color sensor.  One of the kids remarked that a green mat line looked a tad yellow.  I think the mat colors were matched to the sensors, but  there may be production variations between mats ... one more issue to worry about, besides imperfect tables :-)

Our senior team fixed a similar problem with red, which the color sensor was sometimes reading as brown (using the port view on the brick), by making the comparison test "red" or "brown" -- I hope you know that you can test for multiple colors by making multiple checkbox selections on the EV3 color sensor block.  This may be another option.  In Mindstorms NXT, we had "inside range" and "outside range" sliders.

Best,
Nari

----------------------------------------------------------
Anant S Narayanan
Founder & Executive Director

McLean Robotics Institute
McLean VA 22102
202-421-3826 (cell)
[log in to unmask]

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---------- Forwarded message ----------
From: Amy Nichols <[log in to unmask]>
Date: Mon, Nov 10, 2014 at 6:30 PM
Subject: Re: [VADCFLL-L] Thank you!
To: [log in to unmask]


Jill...

That was exactly our the trouble we had.  The color sensor read the black, white, and red, but would not read the green.  The kids thought calibrating the sensor would help, but nothing they tried worked, until they replaced the sensor with another. As soon as they did that it worked fine.  I don't know if each sensor has it's own sensitivity or if the one they had been using all season was just worn out.  My son said he's going to take the replaced one and try it again at home, just to see what happens. It's interesting that your team also experienced the same thing!

Amy


On Monday, November 10, 2014 6:24 PM, Jill Hamilton <[log in to unmask]> wrote:


Amy, thanks for sharing.  We found this too.  Our EV3 color sensor wouldn’t read green.  We realized it was too close to the table.  I am curious what you learned during the competition that helped.
 
Thanks
Jill Hamilton
Coach of Cyborg Piñata 3335
Coach of the Mechanical Manatees
Coach of the Electric Pineapples
 
From: First Lego League in Virginia and DC [mailto:[log in to unmask]] On Behalf Of Amy Nichols
Sent: Sunday, November 09, 2014 10:15 AM
To: [log in to unmask]
Subject: [VADCFLL-L] Thank you!
 
I want to offer a huge thank you from The Ruling Robot Falcons to Karen Berger and all the organizers, judges, referees, and volunteers that helped put on the regional tournament in Newport News yesterday.  Our kids had such a fun time and I appreciate all the work that was put into it!  I think the referees were cheering for all the kids as much as the coaches were!  Thank you all!
 
I also want to add a note about real Gracious Professionalism that happened for our team yesterday.  When we arrived at the school yesterday and our kids ran their robot on the practice boards, they discovered that nothing on their robot worked.  All their missions were dependent on the color sensor, which had was only randomly seeing certain colors.  They tried everything they could think of to fix it, but then got the idea to see if the other teams that had EV3's could help.  So they went around the room asking other teams if they had any ideas or knew how to calibrate a color sensor (one of the things they thought perhaps was wrong).   The other teams all stopped what they were doing to help our kids try to problem solve and help think of what could be wrong.  It was very apparent that these kids were not just there to win a tournament...but they really loved being there and wanted to help.  This just made me love FIRST/FLL even more than I already did, and realize just how great this organization is!
 
Thank you all!

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