As of this writing, GPIO, WiFi, SPI and I2C were ready to test ... the SPI functions to any pins, but the Arduino implementation is preset to a default pinout, so you just need to look it up ...

Occasionally, maker-facing companies create plug-and-play interfaces for the I2C device breakouts they produce, with standardized pinouts and connectors. Following a standard pinout is way better ...

For instance, it's based on the same microcontroller, uses almost identical pinout configuration ... display module. The I2C/TWI pins on the Micro are on D2 and D3. For Arduino beginners, these ...