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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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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

External interrupts


Interrupts are weird things in the Arduino world; however, they are immensely useful. So what are they? Interrupts signal to the microcontroller that something has happened and it needs to take some action. Basically they work like this: we can attach an interrupt to a digital pin. Whenever it detects a change, it will pause anything the microcontroller is doing, execute a function we tell it to execute, and then resume normal operation.

In this example, we will fade two LEDs using PWM and while that is happening, we will be able to select which LED is fading using the button connected to an interrupt.

Getting ready

Following are the ingredients needed for this recipe:

  • An Arduino board connected to a computer via USB

  • Jumper cables and a breadboard

  • Two standard LEDs

  • Two resistors between 220–1,000 ohm

  • A push button

How to do it…

The following are the steps to connect the two LEDs and the button:

  1. Connect the two LEDs to the breadboard and connect their negative terminals together...

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