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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 2. Adding Raspberry Pi to a Humanoid Robot FREE CHAPTER 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 Raspberry Pi to a USB sonar sensor

One of the easiest ways to sense the presence of objects is to use a sonar sensor. Before adding this capability to your system, here's a little tutorial on sonar sensors. Sonar sensors use ultrasonic sound to calculate the distance from an object. The sound wave travels out from the sensor, as illustrated in the following figure:

Connecting Raspberry Pi to a USB sonar sensor

The device emits a sound wave 10 times a second. If an object obstructs these waves, the waves will reflect off of the object and then return to the sensor, as shown in the following figure:

Connecting Raspberry Pi to a USB sonar sensor

The sensor then measures the returning waves. It uses the time difference between when the sound wave was emitted and when it returned in order to measure its distance from the object.

Note

Sonar sensors are also quite accurate, normally with a small percentage error, and are not affected by the lighting or color in the environment.

There are several choices if you want to use a sonar sensor to sense the distance. The first option...

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