Mark Benninger's "Tic Tac Toe-Matic"
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Tic Tac Toe-Matic

Mark's description is missing, so I'll briefly describe his project.   His automated Tic Tac Toe mechanism, similar to Ken Drewe's automated checkers, moved "X's" and "O's" around the board as indicated by his program to automate the game of "Tic Tac Toe."  An interesting difference in his design was how he decided to grip and release the playing pieces.   In the chess mechanism, Ken used an electromagnet to pick up his checkers.   Mark decided to use another approach in his Tic Tac Toe game:   Each of the "X's" and "O's" had magnets cleverly built into their design that attached themselves to his gripper, also an electromagnet, when they came into close proximity to it.   In order to "release" the pieces, Mark energized the electromagnet to the opposite polarity from the pieces, thus repelling them and effectively releasing them from the gripper!