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.

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 ...

In case you missed it, the big news is that a minimal Arduino core is up and working ... The ESP’s dedicated I2C pins are on GPIO 21 and 22 for data and clock respectively.

Makers, developers and hobbyists that are looking for a low-cost Bluetooth Arduino compatible micro controller that can be controlled and programmed wirelessly may be interested to know that the ...