In this chapter, you learned a number of ways to provide output to the user from your BeagleBone programs. You learned how to interface with and control different types of LED and LCD displays, as well as how to have your BeagleBone send messages to you remotely. You built an unread e-mail notification system, a thermometer, a motion detection system, and two different system resource monitors for your BeagleBone Black.

In the next chapter, you will learn how the I2C and SPI protocols work, and how to use them with Python.