SoftI2CMaster
2010-2012, Tod E. Kurt, http://todbot.com/blog/
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
in http://code.google.com/p/blinkm-projects/