Software I2C / TWI library for Arduino allows any two pins to be SDA & SCL
Latest commit f1374d8 Jan 26, 2017 @todbot committed on GitHub updated license, per issue #14



2010-2012, Tod E. Kurt,
2014, by Testato: update library and examples for follow Wire’s API of Arduino IDE 1.x

SoftI2CMaster is an Arduino library that implements
a simple "bit-bang" software-only I2C (aka "TWI") Master.

This lets you use any two Arduino pins to be the SDA & SCL 
pins needed to communicate with I2C devices like BlinkMs.

SoftI2CMaster was originally in the BlinkMSoftI2CDemo example