Description:

This shield (HCARDU0086) is designed to allow you to control a CNC router or milling machine from an Arduino board. It contains 4 driver sockets which allows compatible Pololu A4988 driver modules to be inserted (see HCMODU0068 on our website) providing the ability to drive 3 stepper motor axis (XY& Z) plus an optional 4th auxiliary motor. Additional connectors provide easy connection of end stop sensors and control buttons. 

Schematic and test Sketch available on our support forum.

UNO for Arduino---------------------- expansion board

• 8 ------------------------ EN ( stepper motor driver enableactive 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 )

Features:

• GRBL 0.8c compatible. (Open source firmware that runs on an Arduino UNO that turns G-code commands into stepper signals)
• 4-Axis support (XYZA-Can duplicate XYZ or do a full 4th axis with custom firmware using pins D12 and D13)
• 2 x End stops for each axis (each axis pair shared by same IO pin)
• Spindle enable and direction connection.
• Coolant enable connection.
• Uses removable Pololu A4988 compatible stepper drivers. (A4988DRV8825 and others) see our module HCMODU0068 
• Jumpers headers to set the Micro-Stepping for the stepper drivers. 
• Compact design. 
• Stepper Motors can be connected with 4 pin dupont/molex connectors. 
• 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.)