MAIN FUNCTION: The extension board can be used for engraving machine or 3D printer driver
PWM SPINDLE AND DIRECTION PIN: PWM spindle and direction pin, 4 shaft support (X, Y, Z, A - you can copy X, Y, Z or use pin D12 and D13 customize firmware perform complete shaft 4)
A4988 Stepper Motor Driver Board is a breakout board for Allegro's A4988 DMOS Micro stepping Driver with Translator and Overcurrent Protection;
Package Contents: 1 x CNC Shield Board 4 x A4988 Stepper Motor Driver
5.CNC Shield Expansion Board V3.0 + A4988 Stepper Motor Driver with Heatsink for Arduino Kits K75