Travis Hello and thank you for your software.
At the moment I had not success to make it work, no messages is writes inside the pen drive, but I have seen where I might be wrong!
I provide an external 12V power supply and then I insert the Pen Drive but I don't connect the USB cable for serial communication because I have not space since my cable has a connector at 90 degrees and so there is not space to connect it.
By doing so, I saw that the TX LED does not light up so I understand that it doesn't transmit data via serial port, and seems to not work.
If you only connect the serial cable, I see the TX LED light up for a brief period necessary enough to send the serial message but I can't insert the pen drive due to the low space.
Now I wonder: peraphs without the serial cable, arduino stops the execution of the software?
Tomorrow I'll take home from my office a usb cable straight, and try to see if it works.
Best regards and thank for your support.
Davide