Raspberry Pi Hardware Projects 2

Introduction 1 CHAPTER 1 Computer-Controlled Slot Car Racing 3 Obtaining a Slot Car Racer 4 Hacking Your Slot Car Racer 4 Testing Your Slot Car Racer Hack 6 Getting the Player Input 7 Making the Joystick Buttons 7 Boxing It Up 12 Joystick Testing 16 The Software 18 The Game 20 Over to You 27 CHAPTER 2 Facebook-Enabled Roto-Sketch 29 The Concept 30 Rotary Encoder Types 30 The Encoder Output 31 Posting to Facebook 40 Using Flickr 40 The Final Roto-Sketch Program 44 Creating a Symmetrical Pattern 50 Over to You 56 CHAPTER 3 The Pendulum Pi, a Harmonograph 59 The Concept 61 The Hall Effect 61 Enter the Arduino 63 Putting It Together 64 Smooth Swinging 69 Electronics 71 Programming the Arduino 76 The Final Arduino Code 81 Programming the Pi 89 Using the Pendulum Pi 94 Over to You 96 APPENDIX A Getting Your Raspberry Pi Up and Running 97 The Operating System 98 Getting the OS on an SD Card 99 Premade Cards 99 Creating Your Own SD Card 100 Connecting Your Raspberry Pi 104 Connecting a Display 106 Connecting via HDMI 107 Connecting via DVI 107 Connecting via VGA 109 Connecting via Composite 109 Connecting to a Network 110 Booting the Operating System 111 Powering Up! 113 The Boot Process 114 Starting the Graphical Desktop 114 Starting a Terminal under X 115 Troubleshooting 115 Common Problems 115 No Lights Come On 115 Only the Red Light Comes On 116 No Monitor Output 116 Intermittent Problems 116 Power Problems 116 If You Need More Help 117 Let the Fun Begin! 118 APPENDIX B Introductory Software Project: The Insult Generator119 Running Your First Python Program 120 Saving Your Program 123 Generating an Insult 126 Variables 126 Strings 127 Lists 127 Functions 128 Insult Your Friends by Name! 129 Conditional Behaviour 131 Create a Stream of Insults! 131 Making Your Own Functions 131 Creating Loops 132 for Loop 133 while Statement 134 Putting It All Together 135