Introduction

In the previous chapter, we made use of the Raspberry Pi GPIO to directly control and respond to the attached hardware by controlling or reading the GPIO pins. In this chapter, we will learn how to collect analog data from the real world and process it so we can display, log, graph, and share the data and make use of it in our programs.

We will extend the capabilities of the Raspberry Pi by interfacing with Analog-to-Digital Converters (ADCs), LCD alphanumeric displays, and digital port expanders using Raspberry Pi's GPIO connections.

Tip

Be sure to check out Appendix, Hardware and Software List, which lists all the items used in this chapter and the places you can obtain them from.