Na GRBL nećeš moći da prikačiš LCD, ...
Ako bi baš da imaš i LCD, tastere, džojstik, onda nešto ovako:
http://www.bartvenneker.nl/Arduino/index.php?art=0025
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Make no mistake between my personality and my attitude.
My personality is who I am.
My attitude depends on who you are.