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EducateNXT
Line FollowingWith One Light Sensor
EducateNXT
Attach a light sensor
To attach a light sensor to the EduBot, refer to pages 32-33 of the NXT Building Guide (that
comes with the Education Kit).
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Click
twice to
Then keep clicking untilNow select the port the light sensor is in, probably Port 3.
Reading the value of your light sensor
Select
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Light readings for lots of things
Midair ____________Colored surface (Color ________ ) ____________Colored surface (Color ________ ) ____________Colored surface (Color ________ ) ____________ Darkest reading ____________Brightest reading ____________Black line on line follow board ____________White area on line follow board ____________
Try getting light sensor readings for the following:
Note: The light sensor does not read color. It reads how much light is reflected – which is different for different colors.
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Edge following or line following?
The easiest way to follow a line is to follow
the edge, moving on and off the black.
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When on white it needs to go to black.
When on black it needs to go to white.
?
?
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. . . And back to black again.
While doing this, it edges up the line.
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ForwardB
Stops
Basic Line Follow
Switch
Left
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Basic Line Follow
The trigger point value determines when the sensor is seeing black or white. It is the average between the black % and white %.
The Switch blockand its configuration panel
(Black% + White%) ÷ 2
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Basic Line FollowA partially completed line-follow program should look like this . . .
Set Move block duration to “Unlimited.”
IMPORTANT
Don’t download yet…
What still needs to be added
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Add a Loop block. (The EduBot needs to line follow forever.)
1 2
3
Then Download.
Then drag the Switch into the Loop.
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Have some fun following the line . . .
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And for the teacher . . .
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Finished Line (Edge) Follow Program
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