The I2C/TWI pins on the Micro are on D2 and D3. For Arduino beginners, these two boards are nearly interchangeable, especially when used in simple circuits like the Arduino's built-in examples.

It then moves on to AVR territory showing how to setup the I 2 C in an AtMega micro controller. The author uses a pretty standard to most of us Arduino, with software written in AVR C and a nifty ...

I2C expanders, or ADCs will give you plenty of pins for whatever project you have in mind. All these require extra components, though. Enter the ExtraCore library for Arduino, a software library ...