I am creating an electronic game board for PowerGrid and I want the board to detect which player the piece is related to. i.e. when a player places a piece on the board it adds a plus 1 to their count of cities powered. I was going to use a simple LDR to detect when a piece was placed but need the pieces to be player specific. I was wondering if this was possible with some kind of simple switch system? I am happy to make changes to the wooden playing pieces but bear in mind the playing pieces are approx 1x1x1.5cm (LxWxH). Open to any ideas!