Electronics All-in-One For Dummies, 3rd Edition

Chapter 5

Adding Sound and Motion to Your Arduino Projects

IN THIS CHAPTER

Making sound with a speaker

Using the TONE command to create frequencies

Using an MP3 shield to play sound effects and music

Creating motion with a servo

In this chapter, you learn how to work with devices that add sound and motion to your Arduino projects. To create sound, you can add a speaker to create audible output tones. This is useful in situations where your Arduino program might need to get someone’s attention or when you want to create a sound effect. For more realistic sound effects and music, you can add a shield to your Arduino to play MP3 files that are stored on a micro-SD card. To create motion, you can add a very useful device called a servo, which lets you control mechanical motion with an Arduino program.

Using a Speaker with an Arduino

An inexpensive way to add sound to an Arduino project is to simply add a small 8 Ω speaker to a digital output pin. You can then rapidly alternate the pin between HIGH and LOW to create a square-wave signal on the pin, which the speaker will render as ...