Jill, thank you. That helps. The kids do have a loop looking for green line so perhaps that may be contributing to the problem. I will ask them to test it without the loop. Regards Neelam Kadam On Mon, Nov 17, 2014 at 6:41 AM, Jill Hamilton <[log in to unmask]> wrote: > We found this problem too. We thought it was the motors but the kids > identified that it had to do with the loop cycle. I’m not sure what they > did to correct it. But you might want to test a simple straight line > program without loops to see if it is the motor, the balance or the > program. They are still using the loop cycle. This approach did resolve > their dilemma. > > Best wishes, > > Jill Hamilton > > Cyborg Piñatas > > > > *From:* First Lego League in Virginia and DC [mailto: > [log in to unmask]] *On Behalf Of *Neelam Kadam > *Sent:* Friday, November 14, 2014 10:40 AM > *To:* [log in to unmask] > *Subject:* [VADCFLL-L] Large Motor Question > > > > 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 > > > > > *---------------------------------------------------------- Anant S > Narayanan Founder & Executive Director* > > *McLean Robotics Institute* > > > > * McLean VA 22102 202-421-3826 <202-421-3826> (cell) > [log in to unmask] <[log in to unmask]> > -----------------------------------------------------------* > > > > 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 <202-421-3826> (cell) > [log in to unmask] <[log in to unmask]> > -----------------------------------------------------------* > > > > ---------- 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! > ------------------------------ > > To UNSUBSCRIBE or CHANGE your settings, please visit > https://listserv.jmu.edu/archives/vadcfll-l.html and select "Join or > leave the list". > VADCFLL administrative announcements are sent via VADCFLL-ANNOUNCEMENTS-L. > Visit https://listserv.jmu.edu/archives/vadcfll-announcements-l.html to > subscribe. > ------------------------------ > > To UNSUBSCRIBE or CHANGE your settings, please visit > https://listserv.jmu.edu/archives/vadcfll-l.html and select "Join or > leave the list". > VADCFLL administrative announcements are sent via VADCFLL-ANNOUNCEMENTS-L. > Visit https://listserv.jmu.edu/archives/vadcfll-announcements-l.html to > subscribe. > > > ------------------------------ > > To UNSUBSCRIBE or CHANGE your settings, please visit > https://listserv.jmu.edu/archives/vadcfll-l.html and select "Join or > leave the list". > VADCFLL administrative announcements are sent via VADCFLL-ANNOUNCEMENTS-L. > Visit https://listserv.jmu.edu/archives/vadcfll-announcements-l.html to > subscribe. > > > > > > > > > > > ------------------------------ > > To UNSUBSCRIBE or CHANGE your settings, please visit > https://listserv.jmu.edu/archives/vadcfll-l.html and select "Join or > leave the list". > VADCFLL administrative announcements are sent via VADCFLL-ANNOUNCEMENTS-L. > Visit https://listserv.jmu.edu/archives/vadcfll-announcements-l.html to > subscribe. > -- To UNSUBSCRIBE or CHANGE your settings, please visit https://listserv.jmu.edu/archives/vadcfll-l.html and select "Join or leave the list". -- VADCFLL administrative announcements are sent via VADCFLL-ANNOUNCEMENTS-L. 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