Page 343 - Lego Mindstorms
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Robot 10 • RIS Turtle
Turtle Step 42
Add the light sensor and some
bricks. The round white 2x2 plate is
used together with the light sensor to
form a rotation sensor. As the plate rotates,
the sensor is either blocked by the bumps or
exposed, creating a transition in the light sensor value.
This transition can be monitored in the program, allowing the robot
to measure driving distances and turning angles. The round plate
must be close to the light sensor, but be sure it isn’t touching!
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