Page 349 - Lego Mindstorms

Robot 10 • RIS Turtle

Turtle Step 49

Finally, add
the wheels.
The Turtle is
slightly under-
powered with only
one motor driving it, so
it is best to run it on flat, smooth sur-
faces. It may seem like a disadvantage that the robot is only driven by one motor,
but in this case it is a huge advantage. Since the same motor drives both wheels,
the wheels will rotate at the same speed, enabling the robot to drive in perfectly
straight lines. If two separate motors were used on each wheel, they would likely
rotate at slightly different speeds, causing the robot to draw crooked lines.

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