One of the key aspects of the Raspberry Pi that differentiates it from an average computer is its ability to interface with and control hardware. In this chapter, we use the Raspberry Pi to control remotely activated mains sockets, send commands over serial connections from another computer, and control the GPIO remotely. We make use of SPI (another useful protocol) to drive an 8 x 8 LED matrix display.
We also use a Bluetooth module to connect with a smartphone, allowing information to be transferred wirelessly between devices. Finally, we take control of USB devices by tapping into the commands sent over USB.
Tip
Be sure to check out the Hardware list section in the Appendix, Hardware and Software List; it lists all the items used in this chapter and the places you can obtain them from.