This project introduces circuits. All of the projects that follow use the concepts introduced here.
Your Raspberry Pi has a row of GPIO pins in the long rectangular opening in the case. GPIO stands for General-Purpose Input/Output. You use these pins to connect programs you write to the physical world. We refer to this as physical computing.
With the GPIO Pins a program you write can detect whether a switch has been pressed, or turn on a light. In this first lesson we will learn the basics of Physical Computing. In later lessons we will sense motion, temperature and interact in amazing ways with the real world.