Pin config

RC, you should focus on getting it up and working first - and then worry about expanding later. =)

There are enough pins to run the 5 buttons, the LCD, and everything combined (except Alt I/O) on the Duemilanove. It will require a slight re-arrangement, but no worries about that right now!

I generally don't trust software-based limit switches. Best to use an AND gate between a normally pulled-high limit switch (switch should connect to GND when tripped) and the 'step' lines. That way, if you hit a limit, you won't keep moving and no worries about a software screw-up taking too long to turn off the motors or even a bug causing major damage. Same for e-stop.

The 'sleep' line was set to be shared between all drivers - just connect all axis that you want to go to sleep between moves to it. Then use the kill command in slim to control it.

!c

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