For our online/offline chessboard we came up with a method that reduces time and construction. Here’s the original sketch Rory devised. My quick prototype is pictured here. In particular we’re using an audio connector, as a plug-in system… so that all 64 spaces of the chess board have their own jack. Each chess piece will have its own resistor and whenever a piece jacks into a space, it completes the circuit.
For the audio jacks we’re using … we’ve added 32 resistors to each piece. In order to expand the number of inputs for arduino to 64 we’re using 4 multiplexers to read all of the inputs. The multiplexer makes it possible for several signals to share one device. Here’s more on the multiplexer…