Stepper with Hardware acceleration!
thingiverse
Experience seamless stepper control with an SPI-based system that boasts a range of impressive features. The CPU simply sends position commands, while the controller manages motor turning without requiring position registers or time slicing. Enhanced functionality includes hardware acceleration/deceleration, stall detection, and 1/128 microstepping for smooth operation. However, at $13 per chip (approximately $10 USD), the cost may be a drawback. Compatible with Mighty Mega Mother boards but not standard Mighty boards. The datasheet can be found at http://www.st.com/internet/analog/product/248592.jsp?WT.ac=motor_control_L6470_250610, and the board fits the Mighty Mega design on Thingiverse (http://www.thingiverse.com/thing:19386).
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