They reverse-engineered the motor driver connections – those go through a 74HC245 buffer between the original CPU and the drivers.

Arduino or electronic enthusiasts searching for a new project to keep them busy this weekend may be interested in the awesome Arduino controlled CNC foam cutting machine, constructed from a ...

To controller this CNC machine we need a microcontroller board called arduino Nano and we need motor driver IC for each stepper motor that is L293D IC.