Time Twister 2: LEGO Mindstorms Clock

Time Twister 2 is, as its name suggests, the second clock. It is quite a lot bigger than the first Time Twister.

Each digit is made up of seven segments which are connected in a chain. The connections are made in such a way that a segment can be rotated 180 degrees before the next segment is affected.

By rotating the first segment a specific number of turns you can set the last segment in desired position. Then by rotating the first segment in the opposite direction a specific number of turns you can set the second last segment. By rotating alternately in one direction and the opposite direction, you can set all seven segments of a digit using only a single motor.