In this chapter, we learned how to build a standalone device using the Arduino board as the controlling device. We saw how a standalone device can be easily built around the Arduino board by connecting multiple peripheral devices and powering it from independent power sources.
The HC-SR04 ultrasonic sensor that we used in this chapter can be used in a variety of real-world applications such as: automatic sliding doors, obstacle detectors for toys/robots, depth/distance measurement, and so on. Similarly, you can now start imagining numerous standalone devices that can be built around the Arduino board.
In the next chapter, we will learn how to use Actuators (components that move such as DC motors, Servo motors, and so on). If you look around, there are numerous examples of actuators such as the application of motors in gadgets with moveable parts. Actuators are usually...
