Arduino and Touchpad Tic Tac Toe using arduino

Or, an exercise in input and output multiplexing, and working with bits.  And a submission for the Arduino contest. This is an implementation of a tic tac toe game using a 3x3 array of bicoloured LEDs for a display, a simple resistive touchpad, and an Arduino to tie everything together. Parts and consumables One perf board (or strip board) Nine bicoloured LEDs, common cathode Nine identical resistors, in th ...

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