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This year our team found it "better" to use odometry.  In the past, we have used light sensors with calibration programs.  

Note:  One year the lighting in the gym created a glare on the mat and our robot went out a foot from base and then just turned in a circle.  Our light sensor programs did not work until later in the day when the sun moved to a different angle.  Since then we used shielded light sensors and had much more success.

Respectfully,
K. Niedzialek
FLL coach (6 years)


-----Original Message-----
From: Frank Levine <[log in to unmask]>
To: VADCFLL-L <[log in to unmask]>
Sent: Fri, Nov 9, 2018 10:04 am
Subject: Re: [VADCFLL-L] Light Sensor - Reflected Light Intensity variation - Question

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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