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This robot was created as an entry for Oddbot's challenge: https://www.robotshop.com/letsmakerobots/node/35296 I learned a lot with this project: just check out the Reflection below! Here is how this guy works: a drill motor spins around and the LED on the breadboard displays whether the sensor is high (meaning the robot moves there) or low (led off). The servo is for good looks: connect a wire to ground and it will open up, and this stops the drill motor from moving. ...
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/16-transistor-homebrew-minimalistic-naughts-and-crosses-tic-tac-toe-robot