View source for A4988 Arduino CNC shield

== BOM ==
* Arduino CNC Shield PCB 
* 100uF 50v 8mm High Capacitors (493-3289-ND)
* Jumpers (A26228-ND)
* 8-Pin Female Headers(S7006-ND)
* Male Headers(A26514-40-ND)
* Tactile Switch (450-1650-ND)
* Screw Terminal 5mm (A97996-ND)
* Pololu Stepper Drivers . (Please note that the shield was designed to work with A4988 compatable polulu drivers)
* 10K pull-up resistors
== Schematic ==
<gallery>
File:Arduino-CNC-Shield-Scematics-V3.XX .jpg|schematic 
File:Grbl Pin Layout.png | Board Layout
File:Arduino-CNC-Shield-V3-Layout.jpg | Board Layout 2
</gallery>
== GRBL Software/Firmware ==
GRBL is opensource software that runs on an Arduino Uno that takes G-Code commands via Serial and turns the commands into motor signals.<br />

[https://github.com/grbl/grbl The GRBL source Code is located here.]

== Assembly ==
<gallery>
File:Arduino-CNC-Shield-V3-Assemble-Step4B.jpg
File:Arduino-CNC-Shield-Assemble-009.jpg
File:Arduino-CNC-Shield-V3-Assemble-Step6.jpg
File:Full-Micro-Stepping.jpg|How it looks finally
</gallery>
* For the M0-M2 configuration, set is low when no jumper connected and high when jumper connected, check on A4988 board configuration for this.
* A.STP and A.DIR is to copy/clone the motor setting from X, Y or Z axis to the fourth motor if you have.

== First Run Debugging ==
* Check all the solderings to make sure all soldered well
* Adjust A4988 breakout board when necessary, and carefully install the A4988 driver board
* Connect external power to power up
* upload arduino firmware and test communication via serial port for gbrl, send demo G-code for testing all four axis.


[[category:Stepper Drive]]