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Raspberry Pi Robotic Blueprints
Raspberry Pi Robotic Blueprints

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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Profile Icon Richard Grimmett
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€37.99
Paperback Oct 2015 198 pages 1st Edition
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€20.98 €29.99
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€37.99
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Arrow left icon
Profile Icon Richard Grimmett
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€37.99
Paperback Oct 2015 198 pages 1st Edition
eBook
€20.98 €29.99
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Renews at €18.99p/m
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Paperback
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Raspberry Pi Robotic Blueprints

Chapter 2. Adding Raspberry Pi to a Humanoid Robot

Modifying an RC car with Raspberry Pi is a wonderful project, but you can take this idea even further by modifying different toys with Raspberry Pi. One class of toys that are excellent candidates for our project are a set of robot toys by WowWee. You can purchase these toys from the company directly at http://wowwee.com/, but you can also find used versions of these toys on eBay for a significantly lower price.

In this chapter, you'll learn the following:

  • How to send and receive voice commands
  • How to interpret commands and initiate actions

There are several toys that have excellent possibilities. One such toy is the WowWee Roboraptor. The following is an image of this robot:

Adding Raspberry Pi to a Humanoid Robot

Another option is the WowWee Robosapien. A picture of this robot is given in the following image:

Adding Raspberry Pi to a Humanoid Robot

You'll use this robot for your project, as it has more functionality and is easier to modify. Specifically, you're going to connect to the internal...

Giving your robot voice commands

Now that your robot knows how to respond to the commands from the Python program, you can now add the capability to your robot to respond to voice commands. You'll also add the capability to allow your robot to speak, this will make the robot more interactive.

To add these capabilities to your robot, you'll need to add some hardware. This project requires a USB microphone and speaker adapter. Raspberry Pi itself has an audio output but does not have an audio input. So, you'll need the following three pieces of hardware:

  • A USB device to plug in a microphone and speaker
    Giving your robot voice commands
  • A microphone that can plug into the USB device
    Giving your robot voice commands
  • A powered speaker that can plug into the USB device
    Giving your robot voice commands

Fortunately, these devices are inexpensive and widely available. Make sure that the speaker is powered because your board will generally not be able to drive a passive speaker with enough power for your applications. The speaker can use either internal battery power or can get its power...

Using eSpeak to allow your robot to respond in voice

Sound is an important tool in our robotic toolkit, but you will want to do more than just play music. Let's make our robot speak. You're going to start with enabling eSpeak, an open source application that provides us with a computer voice. It is a voice generation application. To get this free functionality, download the eSpeak library by typing sudo apt-get install espeak at the prompt. The download may take a while but the prompt will reappear when it is complete. Now, let's see if Raspberry Pi has a voice. Type the espeak "hello" command. The speaker should emit a hello in a computer generated voice. If it does not, check the speakers and the volume level.

Now that we have a computer generated voice, you may want to customize it. eSpeak offers a fairly complete set of customization features, including a large number of languages, voices, and other options. To access these, you can type in the options at the...

Using pocketsphinx to accept your voice commands

Now that your robot can talk, you'll also want it to obey voice commands. This section will show you how to add speech recognition to your robotic projects. This isn't nearly as simple as the speaking part but, thankfully, you have some significant help from the open source development community. You are going to download a set of capabilities named pocketsphinx, which will allow our project to listen to our commands.

The first step is downloading the pocketsphinx capabilities. Unfortunately, this is not quite as user-friendly as the eSpeak process, so follow along the steps carefully. There are two possible ways to do this. If you have a keyboard, mouse, and display connected or want to connect through vncserver, you can do this graphically by performing the following steps:

  1. Go to the Sphinx website hosted by Carnegie Mellon University (CMU) at http://cmusphinx.sourceforge.net. This is an open source project that provides you with...

Interpreting commands and initiating actions

Now that the system can both hear and speak, you'll want to provide the robot with the capability to respond to your speech and execute some commands based on the speech input. Next, you're going to configure the system to respond to simple commands.

In order to respond, we're going to edit the continuous.c code in the /home/pi/src/programs directory. We could create our own C file, but this file is already set up in the makefile system and is an excellent starting spot. You can save a copy of the current file as continuous.c.old so that you can always get back to the starting program if required. Then, you will need to edit the continuous.c file. It is very long and a bit complicated. However, you are specifically looking for a section in the code, which is shown in the following screenshot. Look for the comment line /* Exit if the first word spoken was GOODBYE */ comment line.

Interpreting commands and initiating actions

In this section of the code, the word has already been...

Summary

In this chapter, you've learned the basics of how to hack an RC toy car and a toy robot using Raspberry Pi. Feel free to experiment; you can see how easily you can play all sorts of games with your new toys. In the next chapter, you'll learn how to build a robot from the ground up, in this case, a robot that can plan its own path through a set of barriers.

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Key benefits

  • Learn to implement a number of features offered by Raspberry Pi to build your own amazing robots
  • Understand how to add vision and voice to your robots.
  • This fast-paced practical guide comprises a number of creative projects to take your Raspberry Pi knowledge to the next level

Description

The Raspberry Pi is a series of credit card-sized single-board computers developed in the UK by the Raspberry Pi Foundation with the intention of promoting the teaching of basic computer science in schools. The Raspberry Pi is known as a tiny computer built on a single circuit board. It runs a Linux operating system, and has connection ports for various peripherals so that it can be hooked up to sensors, motors, cameras, and more. Raspberry Pi has been hugely popular among hardware hobbyists for various projects, including robotics. This book gives you an insight into implementing several creative projects using the peripherals provided by Raspberry Pi. To start, we’ll walk through the basic robotics concepts that the world of Raspberry Pi offers us, implementing wireless communication to control your robot from a distance. Next, we demonstrate how to build a sensible and a visionary robot, maximizing the use of sensors and step controllers. After that, we focus on building a wheeled robot that can draw and play hockey. To finish with a bang, we’ll build an autonomous hexcopter, that is, a flying robot controlled by Raspberry Pi. By the end of this book, you will be a maestro in applying an array of different technologies to create almost any imaginable robot.

Who is this book for?

This all-encompassing guide was created for anyone who is interested in expanding their knowledge in applying the peripherals of Raspberry Pi. If you have a fancy for building complex-looking robots with simple, inexpensive, and readily available hardware, then this book is ideal for you. Prior understanding of Raspberry Pi with simple mechanical systems is recommended.

What you will learn

  • Add sensors to your robot so that it can sense the world around it
  • Know everything there is to know about accessing motors and servos to provide movement to the robotic platform
  • Explore the feature of adding vision to your robot so it can “see” the world around it
  • Refine your robot with the skill of speech recognition so that it can receive commands
  • Polish your robot by adding speech output so it can communicate with the world around it
  • Maximize the use of servos in Raspberry Pi to create a drawing robot
  • Strengthen your robot by adding wireless communication skills so you can see what the robot is seeing and control it from a distance
  • Build an unbelievable autonomous hexcopter controlled by Raspberry Pi
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Table of Contents

8 Chapters
1. Adding Raspberry Pi to an RC Vehicle Chevron down icon Chevron up icon
2. Adding Raspberry Pi to a Humanoid Robot Chevron down icon Chevron up icon
3. Building a Tracked Vehicle That Can Plan Its Own Path Chevron down icon Chevron up icon
4. Building a Robot That Can Play Laser Tag Chevron down icon Chevron up icon
5. A Robot That Can Draw Chevron down icon Chevron up icon
6. A Robot That Can Play Air Hockey Chevron down icon Chevron up icon
7. A Robot That Can Fly Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon
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