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Arduino Development Cookbook

You're reading from   Arduino Development Cookbook Over 50 hands-on recipes to quickly build and understand Arduino projects, from the simplest to the most extraordinary

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Product type Paperback
Published in Apr 2015
Publisher
ISBN-13 9781783982943
Length 246 pages
Edition 1st Edition
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Concepts
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Author (1):
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Cornel M Amariei Cornel M Amariei
Author Profile Icon Cornel M Amariei
Cornel M Amariei
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Toc

Table of Contents (11) Chapters Close

Preface 1. Power on – Arduino Basics FREE CHAPTER 2. Blinking LEDs 3. Working with Buttons 4. Sensors 5. Motor Control 6. More Output Devices 7. Digital Communication with Arduino 8. Hacking A. Electronics – the Basics Index

Diodes and LEDs

There are two more components we should discuss: diodes and LEDs.

Diodes

A diode is a component that only allows current to pass in one direction. The arrow in the circuit symbol indicates this direction:

Diodes

Next to the circuit symbol on the left, we have a real diode. The stripe represents the stripe in the circuit symbol, and the direction where the current goes out of the diode.

If we look at the following circuits, the one on the left will conduct current while the one on the right will not:

Diodes

However, even when a diode allows current to pass, it drops the voltage. For a typical value, it drops the voltage by 0.7 V. Let's try and apply Ohm's law to the left circuit again. If the diode drops the voltage by 0.7 V, it means we have 4.3 V across the resistor. This will result in:

Diodes

LEDs

There is a variation of the normal diode, called Light Emitting Diode or LED. It's basically a very small and efficient light bulb. We can find LEDs in everything these days: displays, phones...

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