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November 2018

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First Lego League in Virginia and DC <[log in to unmask]>
Date:
Fri, 9 Nov 2018 10:03:37 -0500
Reply-To:
Frank Levine <[log in to unmask]>
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Frank Levine <[log in to unmask]>
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My team totally gave up on the gyro - the 3* accuracy was just too
inconsistent.  They found that with the right tires, odometry is definitely
"better" for them.

I can also confirm that shielded light sensors work pretty well.  We've
used them every year (and will be using them this year too)

-Frank


On Fri, Nov 9, 2018 at 7:34 AM Jeff Borek <[log in to unmask]> wrote:

> I agree with Skip, notably conditions will be different and mechanical
> shielding helps.  I’d just add that what worked for my team last year (I
> never used a formal calibration routine with my 4th and 5th graders):
>
> You probably can take a quick reading over black and white on a
> competition table [port view of on the brick] on the morning of the
> competition.  If your tournament doesn't allow you access to the table you
> can use some time in your practice round and then make necessary changes to
> set-points in the programs for the later rounds.
>
> Also probably obvious but my team found this year that is better to look
> for white than black given the dark background of most of the mat.  [Alas]
> they have given up on light sensor (and gyro) because they find odometry
> "better" this year.
>
> On Fri, Nov 9, 2018 at 6:44 AM Skip Morrow <[log in to unmask]> wrote:
>
>> Yes, you should absolutely expect the lighting conditions to be different
>> on each table you play on. Take that from experience! Now, that doesn't
>> mean it WILL be different--just that you should EXPECT it to be different.
>> That includes practice tables being different from the competition tables
>> and different from your tables at home/school. There are different
>> strategies for dealing with the variances, including mechanical
>> (shielding), calibrations, and strategies that avoid relying on the sensor.
>>
>> .
>>
>>
>> On Fri, Nov 9, 2018 at 5:13 AM LR <[log in to unmask]> wrote:
>>
>>> Experts ... We are using light sensor in our model... We are testing
>>> under the normal household "White Day Light" lights to sense the white
>>> color on the poster.....Will there be any color variation on the
>>> competition ....meaning how to tackle the Reflected Light Intensity
>>> variation from household light to the competition place lights.  Any
>>> suggestion is appreciated.
>>>
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