What are the pros and cons of serial
vs usb?
which would be better for Arduino/freedunio board.
Biggest advantage for the USB is that it can power the Arduino board (but not a lot of extra current available for off board components.
I guess one advantage of using a serial interface version is that the board then can communicate with external devices that are using RS-232 voltage levels without having to have a TTL to RS-232 convertor chip. Program the Arduino via serial on your PC, when done unplug from PC and plug into your external serial device (serial display, GPS device, etc).
Other then that they both work well and the same, I use both.
Lefty
An advantage of USB is that all new PCs and laptops have USB ports. I believe
most laptops probably do not have RS232 ports anymore. I am not sure about
new motherboards but you are probably a lot safer with USB.
(* jcl *)