I found this interesting post: http://forums.reprap.org/read.php?1,307988,612660#msg-612660. I’ve posted a question about it there, but thought I’d check here as well, in case anyone has done this or knows what I would need to do to make one.
According to the post, he has a bunch of buttons, each one apparently hooked up to a different valued resistor, so that pressing any single button sends a discrete voltage to pin D0 on the ramps board. Each voltage has an associated bit of gcode that is sent to the ramps board, and the machine does whatever the command is. It’s stated in the post that nothing needs to be done to the firmware, but it provides a sketch that contains voltage/gcode pairs. How would the I incorporate that sketch into my MPCNC setup? What would the value of the resistors need to be?
Thanks for any help!