And finally, here's the controller board I intend replacing the parallel port cable with. It runs the RepRap GCode firmware on the arduino-compatible RBBB (on the left), and has usb-serial, bluetooth-serial and sd card modules on the right, so I can choose which to use depending on my mood. :) It's not completely wired up yet; I still need to put in the 5v/3.3v regulators and connectors for the limit switches.
Like on the driver board, the modules are all socketed so I'm not committing them to this board forever (I use that BT serial module for everything, you see.)
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