CNC shield expansion board for 3D printer + 4 x A4988 stepper motor driver with heat sink + micro usb UNO R3

By Tenstar Robot

1. Latest CNC shield version 3.0 2. GRBL 0.9 compatible. (Open source firmware that runs on an UNO that turns G-code commands into stepper signals) 3. PWM Spindle and direction pins 4. 4-Axis support (X, Y, Z , A - duplicate X,Y,Z or do a full 4th axis with custom firmware using pins D12 and D13) 5. 2 x End stops for each axis (6 in total) 6. Coolant enabled 7. Uses removable A4988 or DRV8825 compatible stepper drivers 8. Jumpers to set the micro-stepping for the stepper drivers. (Some drivers like the DRV8825 can do up to 1/32 micro-stepping) 9. Compact design 10. Stepper motors connected with 4-pin molex connectors or soldered in place. 11. Runs on 12-36 V DC. (At the moment only the DRV8825 drivers can handle up to 36 V so please consider the operation voltage when powering board.) 12. Please note that this is an unassembled kit and basic soldering skills are needed. A4988 stepper motor driver: 1. A4988 stepper motor driver board is a breakout board for Allegro's A4988 DMOS micro stepping driver with translator and overcurrent protection; please read the A4988 datasheet carefully before using product. Low RDS (On) output 2. Automatic current decay mode detection / selection 3. Mix with slow current decay modes 4. Synchronous rectification for low power dissipation 5. Internal UVLO 6. Crossover-current protection 7. 3.3 and 5 V compatible logic supply 8. Thermal shutdown circuitry 9. Ground fault protection 10. Load short-circuit protection 11. Five selectable step modes: full, 1/2, 1/4, 1/8 and 1/16 UNO R3 board : MCU: ATmega328 USB interface: CH340 Operating voltage: 5 V Digital I/O pins: 14 (including 6 with PWM capability) Analog input pins: 6 I-I/O pin output current: 40 mA max 3.3 V output current: 150 mA max Flash memory: 32 kB (0.5 kB used by bootloader- included) Static RAM (SRAM): 2 kB EEPROM: 1 kB Clock speed: 16 MHz