While the Arduino Due has two separate USB ports, only one of them is a native port accessible to the processor. The second port is only usable for programming, and is connected to a different and much smaller chip that handles the programming task.
To connect to multiple computers from an Arduino Due, you have two options:
- You can reprogram the second MCU to allow it to connect to the computer as a keyboard. This method is tricky because it requires an external programmer for it to work.
- You can use a software USB implementation such as V-USB to use regular digital pins to connect to the computer. This is also tricky because it requires a little electronic know how a few extra components to make this work.
Both options require a little something else to make it work, so you will have to pick based on what you feel more comfortable doing.
