Why do I never see them used in code? Are they OK to use?
I am using them for a shiftin operation because all my other digital pins are used up, and I can't seem to get it to work properly. I am asking here to see if maybe there is something special about those pins that I don't know... I always thought it was funny no one seemed to use them in any sample code I have come across.
For full disclosure, I am using them through an Ethernet shield, but I think the Ethernet shield only uses pins 10, 11, and 12 for comunication so 0, 1, 2, and 3 should be OK?