Pricerange: $ 50.00

http://www.schmalzhaus.com/EBB/
http://shop.evilmadscientist.com/productsmenu/partsmenu/188-ebb
https://www.sparkfun.com/products/10025
http://www.watterott.com/de/EiBotBoard
http://www.techspin.info/archives/tag/eibotboard
http://www.tovaroved.biz/archives/1011

The EiBotBoard was originally designed for the Eggbot project. It is a small (2.2" x 2.2") two channel stepper motor driver board with USB microcontroller. It is based on the UBW board and supports all of the commands that the UBW does (for the most part), plus several extra, like stepper motor commands and RC servo output commands.

The idea with this board is to have a simple way to control two stepper motors from a PC over a USB connection. This is accomplished by two microstepping chopper stepper motor drivers and a small Microchip PIC microcontroller that has USB support. When you plug the EBB into a PC (Windows, Mac or Linux), it will show up as a serial port.  You can easily type commands to it using a terminal emulator, or write your own application to send commands for moving the stepper motors. The Eggbot project has also developed a fantastic Inkscape extension that allows Inkscape to output (print) directly to the EBB.

The main command that gets sent to the EBB tells it to move the motors. This command (the "SM" command) will cause the motors to move in a straight line between two points on a plane. To make curved lines, just break the curve up into small straight line segments. Each movement is executed in a controllable amount of time, so you can control exactly how fast each move executes. The EBB does not understand G-code.