I've uploaded eagle Schematic & PC board layout files to the downloads section for my prototype Arduino compatible Microcontroller (using a replaceable ATmega328PU IC installed in a socket) and a lighted 5 button user input carrier board. This project is optimized to drive a stepper motor using Chuck Fellows' electronic indexing head sketch (some slight software re-writing may be required). Benefits of this project include: -compact design optimized to fit a small protective enclosure -wide input voltage range from 3.5v - 36V, up to 5A current. -onboard 3.5V to 36V 12V, 1A linear regulator for 12V cooling fan -small form factor accommodates all pin inputs on PCB smaller than an UNO -separate lighted 5 button keypad break-out board attachment -larger button faces (10mm dia) w/ wider spacing for easy user input -female header to attach your choice of either 20x4 or 16x2 LCD display -easy front panel attachment of keypad & display w/ your choice of spacing -plug & play header for Pololu's A4988 stepper motor driver carrier board! -plug & play header for Pololu D24V5F5 5V, 500mA DC regulator -header plugs for remote blue LED power on indicator lamp & 12V cooling fan The smaller form factor means that arduino shields wont fit this board, but then this board doesnt need them anyway. All the required components are there and are much more adaptable to fitting to a compact case. The power input is intended first to flow thru a panel mounted dc power jack soldered to a main power switch then soldered to the large solder pads on the PCB. NOTE: try this design now at your own risk since I haven't yet assembled a test circuit. I'm awaiting parts and the printed PCB boards. The final boards will be available thru OSH Park.com. I have no relation to them and dont make any money from their sale of my shared project. Comments are very welcome. In addition to these boards the controller will require two pololu parts, 1. Pololu 5V, 500mA Step-Down Voltage Regulator D24V5F5 2. A4988 Stepper Motor Driver Carrier, Black Edition on and you'll need components which I will post a bill of materials to and a list of suppliers. The lighted LED buttons are $0.99 each on ebay, or about $7.00 each from digikey (ouch) I'll post a notice once I get the schematic verified and tested.