I recently upgraded my shapeoko from an Arduino Uno to a mega and I am using a CNC Stepper Shield designed for the Uno. I realized that the pinout wasn't the same with GRBL for both boards. Is there a ...

I compiled to mega version and uploaded to an arduino mega. I can communicate with grbl by universal gcode sender. But my old setup (i made a shield for my old arduino uno) doesnt work with the mega.