Introduction

The CNC V3 Shield is an all-in-one motion control solution that combines an Arduino-compatible microcontroller with four A4988 stepper motor drivers. This robust shield provides everything needed to control CNC machines, 3D printers, or robotic applications with precision and reliability.

Key Features

Technical Specifications

Pin Configuration

Connector	Function	Arduino Pin
X.STEP	X-axis step pulse	D2
X.DIR	X-axis direction	D5
Y.STEP	Y-axis step pulse	D3
Y.DIR	Y-axis direction	D6
Z.STEP	Z-axis step pulse	D4
Z.DIR	Z-axis direction	D7
A.STEP	A-axis step pulse	D12
A.DIR	A-axis direction	D13
FAN	Cooling fan PWM	D9
SPINDLE	Spindle control	D11

Installation Guide

1. Power Down: Disconnect all power sources
2. Mount Shield: Align and press onto Arduino headers
3. Insert Drivers: Place A4988 drivers in sockets (observe orientation)
4. Connect Motors: Wire steppers to appropriate axis terminals
5. Power Input: Connect 12-36V DC to power terminal
6. Endstops: Connect limit switches if used
7. Cooling: Connect fan to FAN output

Current Adjustment

GRBL Configuration

// Sample GRBL settings for CNC V3 Shield
$0=10          // Step pulse, microseconds
$1=25          // Step idle delay, milliseconds
$2=0           // Step port invert, mask
$3=0           // Direction port invert, mask
$4=0           // Step enable invert, boolean
$5=0           // Limit pins invert, boolean
$6=0           // Probe pin invert, boolean
$10=3          // Status report, mask
$11=0.010      // Junction deviation, mm
$12=0.002      // Arc tolerance, mm
$13=0          // Report inches, boolean
$20=0          // Soft limits, boolean
$21=0          // Hard limits, boolean
$22=0          // Homing cycle, boolean
$23=0          // Homing dir invert, mask
$24=25.000     // Homing feed, mm/min
$25=500.000    // Homing seek, mm/min
$26=250        // Homing debounce, milliseconds
$27=1.000      // Homing pull-off, mm

Troubleshooting

Application Examples