Fun Projects for your LEGO MINDSTORMS

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Ring Stacker

This robot arm can rotate 180 degrees, lift up and down, and open and close its claw to pick up, move, and stack the four colored rings.

The programs provided make the robot solve the classic Towers of Hanoi puzzle, which involves moving a stack of rings from one pole to another, with one spare temporary pole to use. The problem is, the rings are different sizes and stacked in decreasing size, and the rule is that you cannot stack a larger ring on top of a smaller ring. So, the solution is not trivial or immediately obvious. The programs provided (both Word Blocks and Python versions) solve the puzzle using the classic recursive algorithm to this puzzle and then make the arm execute all the necessary moves.

Ring stack starts
on the left pole

Only one spare pole to use...

Ring stack needs to move
to the right pole



Building Instructions



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