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Need some inspiration for your Raspberry Pi projects? Wondering how to work with Wii nunchucks, stepper motors, how to create a remote control panel? If you need guidance,Experimenting with Raspberry Piis your own personal idea generator.Experimenting with Raspberry Picovers how to work with various components and hardware like humidity and temperature sensors, Wii nunchucks, GPIO extenders, and IR receivers so you can add these to your own projects.Written with budgets in mind, author Warren Gay encourages you to build, experiment, and swap out various parts to learn more about the Pi and come up with the best ideas and instructions for your own amazing Raspberry Pi project ideas.What you�ll learn How to make a GPIO extender How to work with a stepper motor and the Pi, including building an H-bridge driver How to make a remote control panel with the Pi How to use Pulse Width Modulation with the Pi Who this book is for Raspberry Pi tinkerers and electronics hobbyists who want to try out the Pi with different sensors and components while learning more about how the Pi works. Contents at a Glance......Page 3 Contents......Page 223 About the Author......Page 229 About the Technical Reviewer......Page 230 Acknowledgments......Page 231 Introduction......Page 4 Characteristics......Page 7 Protocol......Page 8 Overall Protocol......Page 9 Data Format......Page 10 Software......Page 11 Chosen Approach......Page 12 Example Run......Page 14 Source Code......Page 15 DC Characteristics......Page 20 GPIO Output Current......Page 21 GPIO Inputs......Page 22 Output Logic Levels......Page 23 Circuit......Page 24 I2C Bus......Page 25 Wiring and Testing......Page 26 General Configuration......Page 27 IOCON Register......Page 28 GPPUx Register......Page 30 INTCONx Register......Page 31 IODIRx Register......Page 32 INTFx Register......Page 33 GPIOx Register......Page 34 Main Program......Page 35 Module i2c_funcs.c......Page 40 Module sysgpio.c......Page 44 Example Run......Page 47 Response Times......Page 49 Nunchuk Features......Page 51 Connector Pinout......Page 52 Testing the Connection......Page 53 Nunchuk I2C Protocol......Page 54 Read Sensor Data......Page 55 Linux uinput Interface......Page 56 Configuring Events......Page 57 Configure EV_KEY......Page 58 Configure EV_REL......Page 59 Configure EV_ABS......Page 60 Creating the Node......Page 61 Posting EV_REL Events......Page 63 Closing uinput......Page 64 X- Window......Page 65 Testing the Nunchuk......Page 66 Utility lsinputs......Page 68 The Program......Page 69 DS1307 Overview......Page 80 Pin SQW/OUT......Page 82 3-Volt Compatibility......Page 83 Checking for Pull-up Resistors......Page 84 Performing a Tiny RTC Modification......Page 85 Locating the Pull-up Resistors......Page 86 RTC and RAM Address Map......Page 87 I2C Communication......Page 89 Running the Examples......Page 90 The Startup Script......Page 91 Operating Parameters......Page 102 VS1838B Circuit......Page 103 The IR Receiver......Page 104 Signal Components......Page 105 Code Organization......Page 107 Command-Line Options......Page 108 Gnuplot Mode......Page 109 Floppy-Disk Stepper Motor......Page 121 Your Junk-Box Motor?......Page 122 Driver Circuit......Page 124 Darlington Pair......Page 125 Input Levels......Page 127 Power-on Reset/Boot......Page 128 Modes of Operation......Page 129 Full-Step Drive (Mode 1)......Page 130 Software......Page 131 Testing......Page 133 The L298 Driver......Page 141 Inputs In1 and In2......Page 142 L298 PCB......Page 143 Driving from GPIO......Page 145 The DMM Check......Page 146 Two-Phase-On Mode......Page 147 Half-Step Mode......Page 148 Choosing Driving GPIOs......Page 149 Junk-Box Motors......Page 150 Program Operation......Page 151 Program Internals......Page 152 Switched Inputs......Page 160 The CD4013......Page 161 The LED......Page 163 Performing Installation......Page 164 Sensing Station Design......Page 165 Console Program......Page 166 Sensor Source Code......Page 167 Console Source Code......Page 175 Introduction to PWM......Page 183 PWM Software......Page 184 Meter Circuit......Page 185 pwm Program......Page 186 Hardware PWM Set Command......Page 188 Hardware Based CPU Percent-Busy Display......Page 189 Software PWM Program......Page 196 Running the Software PWM Command......Page 198 Software Based CPU Percent-Busy Display......Page 199 Chapter 10:Glossary......Page 204 Chapter 11:Power Standards......Page 210 Power......Page 211 Units......Page 212 Chapter 14:ARM Compile Options......Page 213 Appendix E: Mac OS X Tips......Page 214 Index......Page 216 Need some inspiration for your Raspberry Pi projects? Wondering how to work with Wii nunchucks, stepper motors, how to create a remote control panel? If you need guidance, Experimenting with Raspberry Pi is your own personal idea generator. Experimenting with Raspberry Pi covers how to work with various components and hardware like humidity and temperature sensors, Wii nunchucks, GPIO extenders, and IR receivers so you can add these to your own projects. Written with budgets in mind, author Warren Gay encourages you to build, experiment, and swap out various parts to learn more about the Pi and come up with the best ideas and instructions for your own amazing Raspberry Pi project ideas. What you'll learn How to make a GPIO extenderHow to work with a stepper motor and the Pi, including building an H-bridge driverHow to make a remote control panel with the PiHow to use Pulse Width Modulation with the Pi Who this book is for Raspberry Pi tinkerers and electronics hobbyists who want to try out the Pi with different sensors and components while learning more about how the Pi works. Table of Contents