So yes, you can use ChatGPT to write Arduino drivers, but the catch is that this approach is only going to be possible if you are already extremely good at writing them yourself.

You already have the hardware-based serial interface working with one portion of the project and need a second serial port for unrelated hardware. The obvious solution is to write one in software.

You will need a traditional computer to write Arduino sketches. The Arduino programming environment is written in Java and will run on Macs, PCs, and Linux machines.