In this chapter we have learned about the SPI protocol and its similarities and differences with I2C. We have also checked how to use the RGD LED strip of the Rainbow HAT without the meta driver and we have seen how to work with a couple of screen components that are wired over SPI: LED matrix and OLED screens.

Now that we have completed the review of the basic protocols for communicating with peripherals, let's explore some areas where Android Things really sets itself on a different level in terms of libraries and utilities that allow us to build awesome IoT projects. It is time to look into the real power of Android Things.