Mighty Mega Board :p

thingiverse

Having retired his previous project, the user is now focusing on a Linux-based controller (http://goo.gl/tb8cU) instead of the initially planned MightyBoard from MB. The new board features include a 32-bit CPU running at 66MIPS, SPI-based stepper controllers, USB host support, Android interface hookup, Bluetooth via USB dongle, pluggable MOSFET board, MOSFets powered up to 12V (with 24V being possible but potentially complicating the search for compatible devices), dual thermocouple support, onboard RGB LED support, selectable stepper driver voltages of 12V, 24V, or 36V, and an expandable design that allows for the use of existing steppers if desired. The user plans to submit the PCB design in a few days and has since ordered it, with updates on progress to follow. An issue with a connector hole size was encountered upon receiving the PCB, but overall, the board is now "alive," communicating with an Android phone, and awaiting further population and control software development. The user is considering switching the main board from an Atmel U3C processor to a Raspberry Pi for increased capabilities at a lower cost, including on-board GCODE manipulation, full Ethernet capability, and a graphical user interface. Keep an eye out for updates on this new design. No specific instructions have been provided yet, but the general plan is to get the board made up, soldered together, port firmware from an 8-bit to a 32-bit processor, add Android SDK support, create an Android control app, and assemble everything for maximum awesomeness. The stepper board details can be found at thingiverse.com/thing:19387, and the used CPU is from atmel.com/Images/doc32117.pdf. To program the chip using the AVRDragon, connect PIN 3 (aW or TDO), 4 (+3.3V or Vtg), and 10 (GND) and power up the board with these three connections made.