In this chapter, we learnt how to build a compound device using the Arduino board as the controlling device. We saw how a compound device can be easily built around the Arduino board by connecting multiple peripheral devices.
The MQ2 gas sensor that we used in this chapter can be used in a variety of real world applications such as, household gas leakage detection, handheld gas detectors for geographical surveyors and underground workers, and so on. Similarly, you can now start imagining numerous compound devices that can be built around the Arduino board.
In the next chapter, we will learn how to create a standalone device that is not connected to the computer and that runs on a DC battery power source. If you look around, almost all devices are of a standalone nature. They are powered from a DC battery source and can run in a self-contained manner. Thus, we will move...