I’m planning to use a UART USB cable on my Pi along with a dot3k, connected with jumper wires. Will I be able to do so, and if so, what pins does dot3k use?
You’ll be fine using the UART interface on the GPIO :-) Phil has a nice hack for this in fact! Phil…?
Dot3K uses the I2C, SPI, and 5 other GPIO (for the joystick), if you look at the code library on GitHub it should be pretty clear which :-)