WE use sd card with Arduino mega 2560 for sending g code to grbl V0.8 For more information please visit and download http://sale.panmaneecnc.com/index.php/home/13--software/13-sd-card-grbl-cnc-gcode-sender Firmware Download http://www.panmaneecnc.com/download/controller/SD_Card_G_code_sender_For_GRBL_0.8_v1_13.hex
Arduino Pinout Config http://4.bp.blogspot.com/-yK0Uz1LF-uU/VH7NACke5HI/AAAAAAAAAx8/U5J1W2XSjSE/s1600/grbl_pin_out.gif Keyboard Map http://4.bp.blogspot.com/-dwN-7Rp13lA/VJFwAqhUjFI/AAAAAAAAAz4/nlXAUOppTFs/s1600/PS2%2BSD%2BCard%2BKeyboard%2BMap.gif