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Raspberry Pi Robotic Blueprints

You're reading from   Raspberry Pi Robotic Blueprints Utilize the powerful ingredients of Raspberry Pi to bring to life your amazing robots that can act, draw, and have fun with laser tags

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Product type Paperback
Published in Oct 2015
Publisher
ISBN-13 9781784396282
Length 198 pages
Edition 1st Edition
Concepts
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Toc

Table of Contents (9) Chapters Close

Preface 1. Adding Raspberry Pi to an RC Vehicle FREE CHAPTER 2. Adding Raspberry Pi to a Humanoid Robot 3. Building a Tracked Vehicle That Can Plan Its Own Path 4. Building a Robot That Can Play Laser Tag 5. A Robot That Can Draw 6. A Robot That Can Play Air Hockey 7. A Robot That Can Fly Index

Connecting a digital compass to the Raspberry Pi


One of the important pieces of information that might be useful for your robot, if it is going to plan its own path, is its direction of travel. So, let's learn how to hook up a digital compass to the Raspberry Pi.

There are several chips that provide digital compass capability, one of the most common is the HMC5883L, a 3-axis digital compass chip. This chip is packaged onto a module by several companies but almost all of them result in a similar interface. Here is a picture of one the GY-271 HMC5883L triple axis compass magnetometer sensor module available at a number of online retailers:

This type of digital compass uses magnetic sensors to measure the earth's magnetic field. The output of these sensors is then made accessible to the outside world through a set of registers that allow the user to set things like the sample rate and continuous or single sampling. The X, Y, and Z directions are the output using registers as well.

The connections...

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