Expansion Board Pin-out Definition:

• 8 ----------------------- EN ( stepper motor driver enable, active low )
• 7 ----------------------- Z.DIR (Z -axis direction control )
• 6 ----------------------- Y.DIR (Y -axis direction control )
• 5 ----------------------- X.DIR (X -axis direction control )
• 4 ---------------------- Z.STEP (Z -axis stepper control )
• 3 ---------------------- Y.STEP (Y -axis stepper control )
• 2 ---------------------- X.STEP (X -axis stepper control )
  • 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)
  • 2 x End stops for each axis (6 in total)
  • Spindle enable and direction
  • Coolant enable
  • Uses removable Pololu A4988 compatible stepper drivers. (A4988, DRV8825 and others)
  • Jumpers to set the Micro-Stepping for the stepper drivers. (Some drivers like the DRV8825 can do up to 1/32 micro-stepping )
  • Compact design.
  • Stepper Motors can be connected with 4 pin molex connectors or soldered in place.
  • Runs on 12-36V DC. (At the moment only the Pololu DRV8825 drivers can handle up to 36V so please consider the operation voltage when powering the board.)