Frequently Judges love to see experiments, either with the project or the
robot.  This would be a great thing for the kids to create a hypothesis,
record results, and draw a conclusion.  Real research (experiments &
testing) as opposed to just looking stuff up (which many people call
research these days)


On Fri, Nov 1, 2013 at 10:03 AM, Bdh612-ess <[log in to unmask]> wrote:

> The controller for EV-3 will attempt to keep the two motors in sync using
> an internal PID algorithm and will stop when either of the two motors
> reaches the limit you set. In your case the controller has likely give.
> Motor "C" all there is (100% power) and scaled motor "B" back the max
> amount (what power that is, I don't know), but that was not enough to get
> the two in sync.  So, when motor "B" hit 2.8 revolutions, the controller
> stopped them both.
>
> Likely reasons for this (in my opinion of order of likelihood)
>      1) A heaving discrepancy in tightness between the "B" side and the
> "C" side
>      2) A heavy weighting of the robot to the "C" side (putting more load
> on the "C" motor).
>      3) a defective "C" motor
>
>
> You can rule out #3 by swapping the motors and seeing if the problem
> follows the motor or the robot. Also, running the two motors with nothing
> attached in free air, and by running them with an identical load should
> also be able to shed some light on it.
>
> And as usual, since this has nothing to do with constructing the robot,
> and everything to do with testing materials, you can help as much as you
> want - you can't do more then 100% of course, but that has nothing to do
> with the rules :-)
>
> Brian
>
> Sent from my iPhone
>
> On Nov 1, 2013, at 9:37 AM, Rahman Rasulzada <
> [log in to unmask]> wrote:
>
> <Presentation1.jpg>
>
> Here is the what we are having problem
>
>
> On Fri, Nov 1, 2013 at 8:30 AM, Rahman Rasulzada <
> [log in to unmask]> wrote:
>
>> Hello folks ,
>>
>> We are  having a trouble with new Ev3 large motors. Robot wheels not
>> going straight however they put same values (rotation or degrees) but robot
>> degree values change automatically... My students reset , and updated
>> firmware but still having same issue. Motor values keep change ........
>>
>> Any suggestion ? Really appreciated
>>
>>
>> --
>> _________________________
>> best regard,
>>
>> *Rahman Rasulzada *
>> Pinnacle Academy ,
>> IT Manager & Computer Teacher
>> *School Website <http://www.pinnacleacademyva.com/> *
>> Personal Website <http://rasulzada.wix.com/mycv>
>> Computer Classroom Website<https://sites.google.com/a/pinnacleacademyva.com/computer-technology/>
>>
>>
>
>
> --
> _________________________
> best regard,
>
> *Rahman Rasulzada *
> Pinnacle Academy ,
> IT Manager & Computer Teacher
> *School Website <http://www.pinnacleacademyva.com/> *
> Personal Website <http://rasulzada.wix.com/mycv>
> Computer Classroom Website<https://sites.google.com/a/pinnacleacademyva.com/computer-technology/>
>
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