In the GPIO guidelines, it states:
"GPIO2-3 are used by our products for configuration. If you are experienced with I2C, you might add other slave devices, if you a a novice, we don’t recommend this at all."
I was hoping to use an Adafruit Trinket with a Pi ad HiFiBerry, but this requires an I2C connection, so just wondering what I need to be wary of? Are there any specific things to watch out for?