Communication between two boards

[rnixon]

Yes, and yes

[Ridgeglider]

There are lots and lots of ways to talk betweeen two boards: i2c, serial, SPI, and ethernet via UDP or TCP protocol all come to mind. There are examples of all of these in nburn/examples. As to electrically connecting the boards, it depends how you will communicate. It IS possible to communicate between a development board with Module A to a standalone Module B (and possibly a network) by providing power, along with the appropriate comm signals via jumper wires or clip leads alone. Obviously, this works if you get the connections right, or can ruin both modules and the development board instantly if you get it wrong. If you connect to a network, you may also jeopardize the network too. Both are also true if you were to mount Modules A and B onto their own development boards and attempt to make connections dev board to dev board.