So, I found myself lost when trying to implement a cheap way of detecting movement on a 8x8 array (64 different spots).
As you might've guessed, we're talking about a chess board here, a transparent glass chess board.
At first I was going to do it with something like a webcam on top of the board and RoboRealm doing the motion detection.
Then I realized that using 64 photoresistors would also do the trick. Then again, I'd need to find out how to make an array out of those so I wouldn't need 64 I/O pins. Photoresistors are also kind of expensive.
My question is, does anyone have any ideas to contribute? :)