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GRBL_v09j cnc shield v4 copy by husnain102

Cloned from Sketch GRBL_v09j cnc shield v4 by anthony.ollerton

For people who bought the cnc shield v4 for the nano and are wondering why it isnt working
the direction and step pins are wired up the wrong way. cpu_map_atmega328p.h edited also the step selectors seem to be wired wrong

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