Hi, I am having trouble adding 2-3 software serial ports to my Arduino Uno software.
Searching this site but also googling globally, i found not consistent info like: "SoftwareSerial can have multiple instances, on any 2 pins" vs "rx pin can be only 2 or 3 because these are the only interrupt capable pins".
I gave up searching and did some experimenting instead, with the following results:
-regardless of what the documentation says, only 1 instance of SoftwareSerial works (but there is an example with 2 software serial ports bundled with the library, so what...?).
-can work on any 2 pins.
If i could get 2 software serial ports on my Uno that would be already OK, but of course the more the better (ok i am not trying to ask for 9...).
I have also seen that there are quadruple TTL serial ports SPI "bridges", has anybody some info on them? Does anything similar exist with I2C interface instead?
Thanks and regards,