Software i2c Library

This is just a note to myself really :-)

In order to simplify the chaining of slaves to master I wanted to keep the i2c bus free of any devices other than the slave units (the arduino nanos).

Using i2c displays on the same bus would complicate the process; each slave having two i2c addresses, the screens all carrying the same address etc.

The ideal solution would be to use a library such as this one to create a second bus, just for the screen. this second bus cpild also be used for any further i2c devices added to the slave unit if necessary.