Arduino Cookbook, 3rd Edition

Electronic Components

If you are just starting out with electronic components, you may want to purchase a beginner’s starter kit that contains the basic components needed for many of the recipes in this book. These usually include the most common resistors, capacitors, transistors, diodes, LEDs, and switches.

Here are some popular choices:

• Arduino Starter Kit
• Getting Started with Arduino Kit
• SparkFun Tinker Kit>
• Adafruit MetroX Classic Kit
• ARDX: The starter kit for Arduino

You can also purchase the individual components for your project, as shown in Figure A-1. The following sections provide an overview of common electronic components.

Schematic representation of common components

Capacitor

Capacitors store an electrical charge for a short time and are used in digital circuits to filter (smooth out) dips and spikes in electrical signals. The most commonly used capacitor is the nonpolarized ceramic capacitor; for example, a 100 nF disc capacitor used for decoupling (reducing noise spikes). Electrolytic capacitors can generally store more charge than ceramic caps and are used for higher-current circuits, such as power supplies and motor circuits. Electrolytic capacitors are usually polarized, and the negative leg (marked with a minus sign) must be connected to ground (or to a point with lower voltage than the positive leg). Chapter 8 contains examples showing how capacitors ...