Page 20 - Lego Mindstorms

Robot 1 • The Bug

Bricks & Chips…
Bumper Design

The Bug uses a “normally open” style of bumper. The touch
sensor button is pressed (that is, sensor contacts are closed)
only during a collision.
Another popular design is the “normally closed” style of
bumper. The normal state for these bumpers is with the feeler
pressing against the touch sensor button. The feeler releases
the button when a collision occurs.

Bumper Step 2

The TECHNIC pin with the stop
bushing is used in this step to
convert from a “pin type”
connection to an “axle type”
connection. Later on, the
exposed pins are used to attach
the bumper to the Bug’s frame.

Bumper Step 3

The 3L liftarm adds some much-
needed rigidity to the bumper
assembly.

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