Ok, I have a question about calibrating light sensors. Currently
we are using light sensors but have them setup to work on our practice
table. The sensors generate light and are using reflected light for
the readings. Additionally, the sensors are inside the the body of the
robot and are vey close to the mat. and are pretty much are blocked from
ambient light. So much for what we are doing, it would seem to me, if
most ambient light is excluded and the sensor is generating its own light
and measuring the reflected light and the sensors are very close to the
mat, then we should get the same readings no matter what the venue light is
like and we should not need to calibrate.
Are we way off base on this one? We'll calibrate just in case but
it doesn't seem like we should have to. These new sensors are not like
the old RCX ones.
Kevin,
One way
would be to put on a move block in the direction you want to go followed
by a wait block for light sensor. The move block should be set for
unlimited rotations and the wait block is set up to look for light < 10
(or some number that will eliminate dark blue, etc).
Make sure and
calibrate your light sensor for the ambient light on your
table.
-Frank
-----Original Message-----
From: First Lego
League in Virginia and DC [mailto:[log in to unmask]] On Behalf Of
Kevin Weaver
Sent: Tuesday, November 02, 2010 11:33 AM
To: [log in to unmask]
Subject:
[VADCFLL-L] light sensor and loops
We had a new idea for one of our
missions but are getting stuck on the coding. The kids want to use a loop
and let the robot roll until the light sensor sees the black line. We
can't figure out how to make it stop moving and go onto the next bit of
code at that point. Any tips?
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