This expansion board as a driver expansion board, can be used for engraving machines, 3D printers. It has total of four slots, can drive four A4988 stepper motor. Each stepper motor only need two IO ports. In other words, six IO ports can be well managed for three stepper motors. Very convenient to use.
Latest Arduino CNC Shield Version 3.03
GRBL 0.8c compatible. (Open source firmware that runs on an Arduino UNO that turns G-code commands into stepper signals)
4-Axis support (X, Y, Z , A-Can duplicate X,Y,Z or do a full 4th axis with custom firmware using pins D12 and D13)