In this chapter, we discovered how to manage an ultrasonic sensor in two different manners, by using an ADC and by a serial connection over a USB cable, in order to have two different setups of the same device: one with all peripherals on the BeagleBone Black and one where a sensor is remotized by using a USB connection.
Also, we learned how to manage Linux's LED devices that allow us to have different usage of a simple GPIO line by kernel features.
In the next chapter, we'll see how to realize an aquarium monitor in which we'll be able to record all the environment data, and then we'll see how to control the life of our be loved fishes from a web panel.
