The I C Bus - Exploring Arduino: Tools and Techniques for Engineering Wizardry - page 180

Summary
In this chapter you learned about the following:
■ I 2 C uses two data lines to enable digital communication between the Arduino
and multiple slave devices (so long as they have different addresses).
■ The Arduino Wire library can be used to facilitate communicate with I 2 C
devices connected to pins A4 and A5.
■ I 2 C communication can be employed alongside shift registers and serial
communication to create more complex systems.
■ You can create fonts in Processing to generate dynamically-updating
on-screen displays.
■ Processing can be used to display parsed serial data obtained from I 2 C
devices connected to the Arduino.