Hi,
I'm a newbie.
I have a prototype based on Arduino UNO. I use serial communication to control my prototype. It works fine.
Now I'd like to add simple TCP/UDP capabilities and use as many as possible I/O pins from the UNO board like SPI interface.
I thought using the Arduino Ethernet shield.
Question: Can I use the shield's SPI interface with other devices as long as I don't use pin 10 for SS (Slave Select)?
If not, are there other ethernet shields on the market that allow using the SPI interface of Arduino UNO?
Thank you for support.