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 >>> >>> >>> >>> *---------------------------------------------------------- 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. Visit https://listserv.jmu.edu/archives/vadcfll-ANNOUNCEMENTS-l.html to subscribe.