This expansion board as a driver expansion board, can be used for engraving machines, 3D printers.
It is a total of four slots, can drive four A4988 stepper motor.
Each road stepper motors only need two IO ports.

• GRBL 0.9 compatible. (Open source firmware that runs on an that turns G-code commands into stepper signals)
• PWM Spindle and direction pins
• 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)
• Coolant enable
• Uses removable A4988 or DRV8825 compatible stepper drivers
• 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 DRV8825 drivers can handle up to 36V so please consider the operation voltage when powering the board.)

Please note that this is an unassembled kit and Basic soldering skills are needed

• Mix with slow current attenuation model.
• Internal UVLO and low RDS (on) output.
• Automatic current attenuation mode Detection/Select.
• Phase-in rectifier, low power consumption.
• Warning: Connecting or disconnecting stepping motor while driver is powered on might damage driver.

Packing Included:
1 X V3 Engraver Shield 3D Printer CNC Expansion Board A4988 Driver Board