Building Sheet 2: Build an alarm to protect a box.

One 10 stud axle
Three 5 stud axles

One large gear wheel
One axle extender

 

Three crossblocks
Three connector pegs

Two push sensors
Three connecting leads


One motor, two bricks

Push each axle into the cross-shaped hole in one of the crossblocks. Fasten the connector pegs into the large gear wheel.

Push each crossblock onto a connector peg. The peg holds the crossblock loosely, so that it can rotate.

Use the axle extender to connect the 10 stud axle to the motor. Push this through the central hole of the gear wheel. Use small bricks to mount the motor on the RCX. Use the connecting lead to connect the motor to one of the outputs (A, B or C).

The treasure box rests on two push sensors. Use connecting leads to connect the sensors to inputs 1 and 3.

The wheel with the axles is placed inside a tin. What do you think will happen when the motor is turned on?

 | Published: 4-2-09  | TOP