This is a prototype magnetic linear encoder board. I messed up the footprint, so the board is not functional. I'll fix this and get a v1.1 out ASAP. Gory details here: http://blog.makerbot.com/2009/11/10/monday-rd-fail/The board itself is going to be very awesome: Sporting the Austria Microsystems AS5306 chip which is a magnetic linear encoder. You put down a strip of adhesive backed magnet and then run this chip over it. It will tell you your exact position over the strip down to 15 microns. Hawt.DONT MAKE THIS (YET)