The Arduino CNC Shield V3 Expansion Board is a versatile GRBL-compatible 4-axis controller designed for CNC engraving machines, 3D printers, and DIY robotic projects. It supports X, Y, Z, and A axes with PWM spindle control, end-stop inputs, and microstepping functionality, providing precise and reliable stepper motor control. Paired with the included 4× A4988 stepper drivers, this kit offers a complete solution for hobbyist and professional CNC applications.

Features:

• GRBL 0.9 Compatible: Open-source firmware support to convert G-code commands into precise stepper signals.

• 4-Axis Support: Control X, Y, Z axes and an optional 4th axis (A) for complex CNC operations. Can duplicate axes or enable a custom 4th axis via pins D12 and D13.

• End Stops: Supports 2 end stops per axis (6 total) for accurate positioning and homing.

• PWM Spindle and Direction Pins: Allows spindle speed control directly from the shield.

• Coolant Control: Enables external coolant system integration for CNC milling or engraving.

• Stepper Driver Compatibility: Works with A4988 or DRV8825 stepper drivers for microstepping control.

• Micro-Stepping Jumpers: Supports full, half, quarter, 1/8, 1/16 microstepping; DRV8825 can go up to 1/32.

• Compact and Durable Design: Small footprint, easy to mount on any CNC or 3D printer frame.

• Easy Stepper Connection: Motors connect via 4-pin Molex connectors or soldered directly.

• Wide Voltage Support: Operates on 12–36V DC (note: A4988 max 35V, DRV8825 up to 36V).

• Integrated Protection Features: Includes UVLO, low RDS(on), automatic current attenuation, and mixed-attenuation mode for safe operation.

• Lightweight and Efficient: Minimal power consumption with phase-in rectifier design.

Specifications:

• Controller Type: Arduino CNC Shield V3 Expansion Board

• Firmware: GRBL 0.9 compatible

• Axis Support: 4 axes (X, Y, Z, A)

• Stepper Drivers Included: 4× A4988 Driver Boards

• Stepper Motor Voltage: 12–36V DC

• Microstepping: Full, 1/2, 1/4, 1/8, 1/16 (DRV8825 up to 1/32)

• End Stops: 2 per axis (6 total)

• Spindle Control: PWM & Direction pins

• Stepper Connection: 4-pin Molex or direct solder

• Dimensions: Compact shield design

• Operating Modes: Mixed or slow current attenuation

• Protection Features: UVLO, low RDS(on), automatic current attenuation

Package Contents:

• 1 × Arduino CNC Shield V3 Expansion Board

• 4 × A4988 Stepper Driver Boards

Usage Instructions:

1. Assemble Board: Mount the CNC shield onto an Arduino Uno or compatible board.

2. Install Stepper Drivers: Insert A4988 drivers into the shield, paying attention to orientation.

3. Connect Stepper Motors: Attach motors via Molex connectors or solder wires directly.

4. Set Microstepping: Use jumpers under each driver to select desired microstepping mode.

5. Wire End Stops: Connect limit switches for homing and safety.

6. Connect Spindle: Attach spindle via PWM and direction pins if using CNC milling.

7. Power On: Apply 12–36V DC to the board, ensuring voltage is compatible with your driver type.

8. Upload GRBL Firmware: Use Arduino IDE to upload GRBL 0.9 firmware for operation.

9. Caution: Do not connect/disconnect motors while powered to avoid driver damage.

Applications:

• DIY CNC milling machines and routers

• 3D printer control for multiple axes

• Engraving machines and laser cutters

• Robotics projects requiring precise stepper control

• CNC hobbyist or small-scale industrial use

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