Scriptronics CNC V3 Shield Expansion Board + UNO R3 Board + 4Pcs A4988 Stepper Motor Driver for Engraver 3D Printer (Arduino Kits) Educational Electronic Hobby Kit

Latest for Arduino IDE CNC Shield Version 3. 0 GRBL 0. 9 compatible 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 Compatible with A4988 or DRV8825 stepper driver Runs on 12-36V DC for ArduinoIDE Board: MCU: ATmega328 USB interface: ATmega16U2 Operating voltage: 5V Digital I/O pins: 14 (including 6 with PWM capability) Analog input pins: 6 I-I/O pin output current: 40mA max 3. 3V output current: 150mA max Flash memory: 32 kB (0. 5kB used by bootloader - included) Static RAM (SRAM): 2 kB EEPROM: 1 kB Clock speed: 16MHz A4988 Stepper Motor Driver: A4988 Stepper Motor Driver Board is a breakout board for Allegro's A4988 DMOS Micro stepping Driver with Translator and Overcurrent Protection; Low RDS (On) Output : Automatic current decay mode detection / selection Mix with slow current decay modes Synchronous rectification for low power dissipation Internal UVLO Crossover-current protection 3. 3 and 5 V compatible logic supply Thermal shutdown circuitry Ground fault protection Load short-circuit protection Five selectable step modes: full, 1/2, 1/4, 1/8 and 1/16 Warning: Connecting or disconnecting a stepper motor while the driver is powered can destroy the driver. (More generally, rewiring anything while it is powered is asking for trouble).