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November 2014

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Sender:
First Lego League in Virginia and DC <[log in to unmask]>
Date:
Wed, 12 Nov 2014 09:07:40 -0500
Reply-To:
Ting-Ting Chow <[log in to unmask]>
Subject:
From:
Ting-Ting Chow <[log in to unmask]>
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To: Frank Levine <[log in to unmask]>
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We discovered that the area of the green line where there is a large grey
circle has been the issue. For some reason, the sensor seems to have some
problems differentiating between green and grey when there is a lot of grey
around.

On Wed, Nov 12, 2014 at 8:50 AM, Frank Levine <[log in to unmask]>
wrote:

> With our Robot, we can put the sensor directly over the green line and
> watch it flip back and forth between Green and White.  I'm guessing that
> the color that FLL used on the mats is not exactly "Lego Green", or that
> the slightly shinier material this year is causing the sensor to get
> confused on green.   We have no issues with red or black... just green. Our
> solutions don't rely on the green lines because it just wasn't reliable.
>
> -Frank
>
> On Wed, Nov 12, 2014 at 6:24 AM, Neelam Kadam <[log in to unmask]> wrote:
>
>> Try slowing the robot down.
>>
>> Sent from my iPad
>>
>> On Nov 11, 2014, at 11:41 PM, Mssuchitra Suchitra <[log in to unmask]>
>> wrote:
>>
>> I am glad to see this email thread on color sensor issues.
>>
>> First of all, thanks a lot for all the tips and suggestions we get
>> through this email distro. It has been very helpful for us.
>>
>> We are having similar issues with the color sensor as well. Our robot is
>> able to identify the green color when it is on a straight line movement,
>> but having difficulty identifying the green color when the robot is on
>> rotational circular movement. I am guessing that the color intensity
>> changes very quickly when it is on rotational movement, there by causing
>> the difficulty in the robot sensing the green color.
>>
>> Any suggestions on how we could resolve the same ?
>>
>> Thanks
>> Suchitra
>> On Nov 11, 2014 8:01 AM, "Lloyd O'Hara" <[log in to unmask]> wrote:
>>
>>>  sounds like there will be some more color sensors in our near future.
>>> Thanks
>>>
>>> ----- Original Message -----
>>> *From:* Neelam Kadam <[log in to unmask]>
>>> *To:* Lloyd O'Hara <[log in to unmask]>
>>> *Cc:* <[log in to unmask]>
>>> <[log in to unmask]>
>>> *Sent:* Tuesday, November 11, 2014 7:57 AM
>>> *Subject:* Re: [VADCFLL-L] Issues with color sensor
>>>
>>> Lloyd,
>>>
>>> This is with the EV3 sensors. I highly recommend having spare sensors
>>> during the tournament. We went with 2 identical robots and luckily did not
>>> have the sensor issue but better to be prepared.
>>>
>>> Regards
>>> Neelam
>>>
>>> On Tue, Nov 11, 2014 at 7:51 AM, Lloyd O'Hara <[log in to unmask]>
>>> wrote:
>>>
>>>>  Thanks for the change Brittany.
>>>>
>>>> Neelam,
>>>>
>>>> Was this NXT or EV3.  I ask because we are relying heavily on our NXT
>>>> color sensors and we only have two, both in use.  I may have to quickly
>>>> order a couple more if folks are seeing this with the NXT.
>>>>
>>>> Thanks,
>>>>
>>>> Lloyd
>>>>
>>>> ----- Original Message -----
>>>> *From:* Brittany Rose <[log in to unmask]>
>>>> *To:* [log in to unmask]
>>>> *Sent:* Tuesday, November 11, 2014 7:44 AM
>>>> *Subject:* [VADCFLL-L] Issues with color sensor
>>>>
>>>> Replying to change the subject from "thank you" to "issues with color
>>>> sensor" so that this thread can be searched up more easily in the archives.
>>>>
>>>>  On Nov 11, 2014, at 7:42 AM, Neelam Kadam wrote:
>>>>
>>>>  We have the same issue. Once in a while, the color sensor just stops
>>>> sensing green! Faulty sensors?
>>>>
>>>> On Tue, Nov 11, 2014 at 7:07 AM, Skip Morrow <[log in to unmask]> wrote:
>>>>
>>>>>  Wow. Add us to the list of teams with color sensor issues this past
>>>>> weekend. Many of our missions relied on the sensor, and had been working
>>>>> nearly perfectly in team practices.
>>>>>
>>>>> When we got to the tournament, we did pretty good on our practice
>>>>> round. But then for round 1 no missions worked. We hadn't changed anything,
>>>>> so we were puzzled. Back in the pit, we troubleshot and troubleshot. We
>>>>> could tell that the sensor was changing from color mode to light intensity
>>>>> mode for no apparent reason. You should see a blue-ish light coming from
>>>>> the sensor when it is in color mode. A reddish light indicates light
>>>>> intensity mode. Depending on the settings of the wait block, the sensor
>>>>> should automatically select the correct mode. Well, ours would
>>>>> spontaneously switch over to light intensity mode, even though we never use
>>>>> light intensity.
>>>>>
>>>>> Round two came and went and we got lucky on one mission. We still had
>>>>> not figured out what was going on. Finally, we tried our backup robot. And
>>>>> everything worked perfectly. 100%. It just never occurred to us that we
>>>>> could be facing a hardware issue.
>>>>>
>>>>> For round three we went to the table and all of our missions worked.
>>>>>
>>>>>
>>>>> .
>>>>>
>>>>> On Mon, Nov 10, 2014 at 6:35 PM, Monson Gmail <[log in to unmask]
>>>>> > wrote:
>>>>>
>>>>>>  Jill,
>>>>>>
>>>>>> We had a similar issue with color sensor, but we build a shield
>>>>>> around the sensor and the issue was resolved. We researched and found this
>>>>>> solution.
>>>>>>
>>>>>> Thanks,
>>>>>> Monson
>>>>>> Rookie coach of Future Geekbots
>>>>>>
>>>>>>
>>>>>> On Nov 10, 2014, at 6:23 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] <[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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>
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