Search icon CANCEL
Subscription
0
Cart icon
Your Cart (0 item)
Close icon
You have no products in your basket yet
Arrow left icon
Explore Products
Best Sellers
New Releases
Books
Videos
Audiobooks
Learning Hub
Newsletter Hub
Free Learning
Arrow right icon
timer SALE ENDS IN
0 Days
:
00 Hours
:
00 Minutes
:
00 Seconds
Intel Galileo Essentials
Intel Galileo Essentials

Intel Galileo Essentials: Leverage the power of Intel Galileo to construct amazingly simple, yet impressive projects

Arrow left icon
Profile Icon Richard Grimmett
Arrow right icon
€18.99 per month
Paperback Feb 2015 162 pages 1st Edition
eBook
€13.98 €19.99
Paperback
€24.99
Subscription
Free Trial
Renews at €18.99p/m
Arrow left icon
Profile Icon Richard Grimmett
Arrow right icon
€18.99 per month
Paperback Feb 2015 162 pages 1st Edition
eBook
€13.98 €19.99
Paperback
€24.99
Subscription
Free Trial
Renews at €18.99p/m
eBook
€13.98 €19.99
Paperback
€24.99
Subscription
Free Trial
Renews at €18.99p/m

What do you get with a Packt Subscription?

Free for first 7 days. $19.99 p/m after that. Cancel any time!
Product feature icon Unlimited ad-free access to the largest independent learning library in tech. Access this title and thousands more!
Product feature icon 50+ new titles added per month, including many first-to-market concepts and exclusive early access to books as they are being written.
Product feature icon Innovative learning tools, including AI book assistants, code context explainers, and text-to-speech.
Product feature icon Thousands of reference materials covering every tech concept you need to stay up to date.
Subscribe now
View plans & pricing
Table of content icon View table of contents Preview book icon Preview Book

Intel Galileo Essentials

Chapter 2. Accessing the GPIO Pins

Now that you are familiar with the Galileo IDE and know how to create, edit, and upload a program, this chapter will now focus on hardware. You'll learn about the capabilities of the General Purpose Input/Output (GPIO) pins and how you can connect to and access them via software. Specifically, you'll learn about the following:

  • The GPIO pins, what they can and can't do
  • How to use and access them using some very basic circuits and very simple programming examples that demonstrate how to make the Galileo access the outside world

The GPIO capability of the Galileo

The Galileo was built to model how the Arduino accesses the outside world. Much of that access should be through the GPIO pins. The Galileo comes with a standard set of 14 digital and 6 analog IO pins, along with some additional pins to provide power and serial IO. Fortunately, the pins are actually well labeled on the board itself.

Here is a close-up:

The GPIO capability of the Galileo

Here is a list of pins that are available, and a brief description of what each pin can do, starting at the upper right and going clockwise. A more in-depth description of these pins will come later as you actually use them in some example projects:

Galileo Pin

Description

AREF

This pin provides a reference voltage for the analog inputs. The values on the analog pins will be reported in reference to this voltage. You'll also use this in some applications to provide a reference voltage for sensing devices. You can also provide an external reference value to this pin, which means that the numerical...

Using the GPIO pins

Now that you are aware of all the GPIO capabilities, you can start putting them to work. In order to do this, it is best to purchase a small breadboard and some jumper wires; this will make connecting to the outside world easier. Here is a picture of such a breadboard:

Using the GPIO pins

They are easy to find, you can purchase one at almost any electronics store, or on any electronic online sites. You'll need some jumper wires to connect from the Galileo to the breadboard. The jumper wires you want are the Male-to-Male solder-less jumper wires. Here is a picture of this sort of wire:

Using the GPIO pins

These jumper cables plug easily into the header pins on the Galileo and the breadboard. Now that you have the cables and the breadboard, you can start accessing and controlling hardware.

Connecting your first external hardware

Your first project will use the Digital IO pins to light up an LED. To do this, you'll need to gather two more hardware pieces. The first is an LED (Light Emitting Diode). This is a small part with two leads that lights up when voltage is applied. They come in a wide variety of colors. If you want to buy them online, search for a 3-mm LED. You can also get them at most electronics shops. The image shows an LED:

Connecting your first external hardware

You'll also need a resistor to limit the current to the LED; a 220-ohm resister would be the right size. Again, you can get them online or at most electronics shops. The following image shows a resistor:

Connecting your first external hardware

If you get three LEDs and resistors, you can exercise three of the Digital IO pins.

Plugging your wires into the breadboard

Now that you have all the bits and bobs, let's build your first hardware project. Before you plug anything in, let's look at the breadboard for a moment so that you can understand how you are going to use...

The IDE and LED Code

To create the code for this example, start the Galileo IDE. Recall the Blink example you accessed in Chapter 1, Getting Started with the Galileo. The IDE should look like this:

The IDE and LED Code

If you remember this code, int led = 13 lit the orange LED on the board. It turns out that LED output pin 13 is also the connection to the 13 pin on the Galileo connector. If you upload and run this program, the LED connected to pin 13 should flash at the same rate as the LED on the Galileo. Here is a picture:

The IDE and LED Code

You'll need to add a similar bit of code to get the LEDs connected to pin 12 and 11. Add the following to the sketch on the IDE:

The IDE and LED Code

Here, you are replicating the code but connecting the LED connected to pin 13 to the variable led, the LED connected to pin 12 to the variable led1, and the LED connected to pin 13 to the variable led3. You then program them all to be output pins and then in the main loop toggle between high and low. Notice I have two pins toggling together (pins 13 and 11)...

Getting signals from the outside world

You know how to send signals to the outside world. You might also want to receive input signals from the outside world. These signals can be divided into two types: digital signals and analog signals.

Interfacing digital input signals with Galileo

There are pins on the GPIO connectors of the Galileo than can be used to sense digital input; that is, an input that will be interpreted as either a 0 or 1 by a program. These are labelled on the Galileo. An example of how to use these is a simple button press circuit. To create this circuit, you'll need one of the 220-ohm resistors you used in the LED circuit. You'll also need a simple, single-pole, single-throw switch; you can get these at most electronics stores. You'll also need some jumper wires to connect the Galileo to your circuit. Here is the circuit diagram:

Interfacing digital input signals with Galileo

Now you'll need some code. You can use one of the example programs included with the IDE. Select the Examples | 02.Digital...

The GPIO capability of the Galileo


The Galileo was built to model how the Arduino accesses the outside world. Much of that access should be through the GPIO pins. The Galileo comes with a standard set of 14 digital and 6 analog IO pins, along with some additional pins to provide power and serial IO. Fortunately, the pins are actually well labeled on the board itself.

Here is a close-up:

Here is a list of pins that are available, and a brief description of what each pin can do, starting at the upper right and going clockwise. A more in-depth description of these pins will come later as you actually use them in some example projects:

Galileo Pin

Description

AREF

This pin provides a reference voltage for the analog inputs. The values on the analog pins will be reported in reference to this voltage. You'll also use this in some applications to provide a reference voltage for sensing devices. You can also provide an external reference value to this pin, which means that the numerical values...

Left arrow icon Right arrow icon

Description

This book is for anyone who has ever been curious about using the Intel Galileo to create electronics projects. Some programming background is useful, but if you know how to use a personal computer, with the aid of the step-by-step instructions in this book, you can construct complex electronics projects that use the Intel Galileo.

Who is this book for?

This book is for anyone who has ever been curious about using the Intel Galileo to create electronics projects. Some programming background is useful, but if you know how to use a personal computer, with the aid of the step-by-step instructions in this book, you can construct complex electronics projects that use the Intel Galileo.

What you will learn

  • Access the Linux system that is the basis for Galileo to add even more complex hardware and software
  • Install and use the software development environment and connect to the Galileo and develop programs for it
  • Add a simple display to the Galileo
  • Connect external HW to the GPIO pins
  • Control DC motors with the Galileo
  • Add sensors to a Galileobased project
  • Access your Galileo wirelessly
  • Understand the basics of sketches, include files, and HW support

Product Details

Country selected
Publication date, Length, Edition, Language, ISBN-13
Publication date : Feb 24, 2015
Length: 162 pages
Edition : 1st
Language : English
ISBN-13 : 9781784398903
Vendor :
Intel
Category :
Tools :

What do you get with a Packt Subscription?

Free for first 7 days. $19.99 p/m after that. Cancel any time!
Product feature icon Unlimited ad-free access to the largest independent learning library in tech. Access this title and thousands more!
Product feature icon 50+ new titles added per month, including many first-to-market concepts and exclusive early access to books as they are being written.
Product feature icon Innovative learning tools, including AI book assistants, code context explainers, and text-to-speech.
Product feature icon Thousands of reference materials covering every tech concept you need to stay up to date.
Subscribe now
View plans & pricing

Product Details

Publication date : Feb 24, 2015
Length: 162 pages
Edition : 1st
Language : English
ISBN-13 : 9781784398903
Vendor :
Intel
Category :
Tools :

Packt Subscriptions

See our plans and pricing
Modal Close icon
€18.99 billed monthly
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Simple pricing, no contract
€189.99 billed annually
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Choose a DRM-free eBook or Video every month to keep
Feature tick icon PLUS own as many other DRM-free eBooks or Videos as you like for just €5 each
Feature tick icon Exclusive print discounts
€264.99 billed in 18 months
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Choose a DRM-free eBook or Video every month to keep
Feature tick icon PLUS own as many other DRM-free eBooks or Videos as you like for just €5 each
Feature tick icon Exclusive print discounts

Frequently bought together


Stars icon
Total 74.97
Home Automation with Intel Galileo
€24.99
Intel Galileo Essentials
€24.99
Internet of things with Intel Galileo
€24.99
Total 74.97 Stars icon

Table of Contents

9 Chapters
1. Getting Started with the Galileo Chevron down icon Chevron up icon
2. Accessing the GPIO Pins Chevron down icon Chevron up icon
3. Adding Display Functionality Chevron down icon Chevron up icon
4. Controlling DC Motors Chevron down icon Chevron up icon
5. Adding Sensors Chevron down icon Chevron up icon
6. Remote Control Chevron down icon Chevron up icon
7. Going Further with Galileo Chevron down icon Chevron up icon
8. Speech Output Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon
Get free access to Packt library with over 7500+ books and video courses for 7 days!
Start Free Trial

FAQs

What is included in a Packt subscription? Chevron down icon Chevron up icon

A subscription provides you with full access to view all Packt and licnesed content online, this includes exclusive access to Early Access titles. Depending on the tier chosen you can also earn credits and discounts to use for owning content

How can I cancel my subscription? Chevron down icon Chevron up icon

To cancel your subscription with us simply go to the account page - found in the top right of the page or at https://subscription.packtpub.com/my-account/subscription - From here you will see the ‘cancel subscription’ button in the grey box with your subscription information in.

What are credits? Chevron down icon Chevron up icon

Credits can be earned from reading 40 section of any title within the payment cycle - a month starting from the day of subscription payment. You also earn a Credit every month if you subscribe to our annual or 18 month plans. Credits can be used to buy books DRM free, the same way that you would pay for a book. Your credits can be found in the subscription homepage - subscription.packtpub.com - clicking on ‘the my’ library dropdown and selecting ‘credits’.

What happens if an Early Access Course is cancelled? Chevron down icon Chevron up icon

Projects are rarely cancelled, but sometimes it's unavoidable. If an Early Access course is cancelled or excessively delayed, you can exchange your purchase for another course. For further details, please contact us here.

Where can I send feedback about an Early Access title? Chevron down icon Chevron up icon

If you have any feedback about the product you're reading, or Early Access in general, then please fill out a contact form here and we'll make sure the feedback gets to the right team. 

Can I download the code files for Early Access titles? Chevron down icon Chevron up icon

We try to ensure that all books in Early Access have code available to use, download, and fork on GitHub. This helps us be more agile in the development of the book, and helps keep the often changing code base of new versions and new technologies as up to date as possible. Unfortunately, however, there will be rare cases when it is not possible for us to have downloadable code samples available until publication.

When we publish the book, the code files will also be available to download from the Packt website.

How accurate is the publication date? Chevron down icon Chevron up icon

The publication date is as accurate as we can be at any point in the project. Unfortunately, delays can happen. Often those delays are out of our control, such as changes to the technology code base or delays in the tech release. We do our best to give you an accurate estimate of the publication date at any given time, and as more chapters are delivered, the more accurate the delivery date will become.

How will I know when new chapters are ready? Chevron down icon Chevron up icon

We'll let you know every time there has been an update to a course that you've bought in Early Access. You'll get an email to let you know there has been a new chapter, or a change to a previous chapter. The new chapters are automatically added to your account, so you can also check back there any time you're ready and download or read them online.

I am a Packt subscriber, do I get Early Access? Chevron down icon Chevron up icon

Yes, all Early Access content is fully available through your subscription. You will need to have a paid for or active trial subscription in order to access all titles.

How is Early Access delivered? Chevron down icon Chevron up icon

Early Access is currently only available as a PDF or through our online reader. As we make changes or add new chapters, the files in your Packt account will be updated so you can download them again or view them online immediately.

How do I buy Early Access content? Chevron down icon Chevron up icon

Early Access is a way of us getting our content to you quicker, but the method of buying the Early Access course is still the same. Just find the course you want to buy, go through the check-out steps, and you’ll get a confirmation email from us with information and a link to the relevant Early Access courses.

What is Early Access? Chevron down icon Chevron up icon

Keeping up to date with the latest technology is difficult; new versions, new frameworks, new techniques. This feature gives you a head-start to our content, as it's being created. With Early Access you'll receive each chapter as it's written, and get regular updates throughout the product's development, as well as the final course as soon as it's ready.We created Early Access as a means of giving you the information you need, as soon as it's available. As we go through the process of developing a course, 99% of it can be ready but we can't publish until that last 1% falls in to place. Early Access helps to unlock the potential of our content early, to help you start your learning when you need it most. You not only get access to every chapter as it's delivered, edited, and updated, but you'll also get the finalized, DRM-free product to download in any format you want when it's published. As a member of Packt, you'll also be eligible for our exclusive offers, including a free course every day, and discounts on new and popular titles.