VADCFLL-L Archives

November 2014

VADCFLL-L@LISTSERV.JMU.EDU

Options: Use Monospaced Font
Show HTML Part by Default
Condense Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Sender:
First Lego League in Virginia and DC <[log in to unmask]>
Date:
Fri, 14 Nov 2014 11:54:18 -0500
Reply-To:
Neelam Kadam <[log in to unmask]>
Subject:
From:
Neelam Kadam <[log in to unmask]>
Content-Type:
multipart/alternative; boundary="001a11331a48ce77600507d47a99"
In-Reply-To:
MIME-Version:
1.0
Comments:
To: Phil Smith III <[log in to unmask]>
Parts/Attachments:
text/plain (7 kB) , text/html (21 kB)
Thank you for the responses. Very helpful. The differences in motors
explains the veering to the right but I would think that switching the
motors between ports B and C means there are differences in the two ports
themselves as well regardless of the motor differences.


On Fri, Nov 14, 2014 at 10:50 AM, Phil Smith III <[log in to unmask]> wrote:

> Motors don’t deliver consistent power/torque. One argument for using a
> differential (not suggesting it’s always appropriate, just sometimes it
> helps!)
>
>
>
> *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
> NarayananFounder & Executive Director*
>
> *McLean Robotics Institute*
>
>
>
> *McLean VA 22102202-421-3826 <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
> NarayananFounder & Executive Director*
>
> *McLean Robotics Institute*
>
>
>
> *McLean VA 22102202-421-3826 <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.


ATOM RSS1 RSS2