As previously stated many times in this book, the true value of Raspberry Pi comes from its flexibility. This stands true for the electronics, where the General Purpose input/output (GPIO) pins allow Raspberry Pi to connect to different sensors and electronic components. In plain English, this means that the GPIO pins connect Raspberry Pi to the real world.

In this chapter, you will learn the basic laws of electronics, which is of absolute importance for creating electronics projects with your Raspberry Pi. Along with this, you will be introduced to various electronics components that will be used in the later part of this chapter to make an e-mail notifier and alarm clock. In this chapter, we will cover the following topics: