I'm planing a project that is using rfid to find location.
I find that using 2, then computer calculate angle for difference of time.
Beside, if i use more then 2 of it, I can find location of 2d or even 3d map.
However, my arduino mega doesn't have more than 3 serial port.
So, I'm wonder could I expand rx tx port? I want 8 port....