A4988 Driver CNC Shield Expansion Board for Arduino is an Arduino shield which controls four stepper motors by using four A4988 stepper motor driver boards. The board’s pinout is compatible with open source CNC control firmware Grbl. While the pinout makes it possible for the board to be used as an Arduino shield, the board can also be controlled by external signals using the parallel male headers to drive the stepper motors. By that way the shield actually becomes a general purpose control board and can be interfaced with any microcontroller system.
Another good feature of A4988 Driver CNC Shield Expansion Board for Arduino is one of the motors can clone the movement of one of the other two motors. Since there are lots of CNC or 3D printer systems that have double motors for single axis, this feature makes the board a pretty good choice to be used with these systems.
Note: A4988 motor driver boards are NOT included in the package.