Build an analog, hand-cranked, LEGO-based Larson Scanner using our Crazy Circuits system. Turning the crank will rotate the cylinder and cause each circuit to be completed in sequence.
See the attached PDF guide, as well as the photos and video to understand how the Larson Scanner works.
We've also got a longer video of the Larson Scanner in action available on the Brown Dog Gadgets YouTube Channel.
So far our favorite crank is made with two pieces. The LEGO Technic Half Beam 3 with Knob and Pin (33299 / 61408) and the LEGO Pin Joiner Round with Slot (29219 / 62462)
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