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  • Book Overview & Buying Learning BeagleBone
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Learning BeagleBone

Learning BeagleBone

By : Hunyue Yau
4.3 (4)
Buy this Book
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Learning BeagleBone

Learning BeagleBone

4.3 (4)
By: Hunyue Yau
Buy this Book

Overview of this book

This book is for new BeagleBone owners who are looking to quickly get their microboard up and running. It would be helpful to have an understanding of embedded concepts or Linux but neither is essential.
Table of Contents (13 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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Disclaimer
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1
1. Introducing the Beagle Boards
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1. Introducing the Beagle Boards
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The Beagle board family
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The Beagle boards
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Summary of the Beagle board family
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Congratulations on selecting a BeagleBone board
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Unboxing and powering up your BeagleBone
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The Windows configuration
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The Linux configuration
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Useful PC software for your BeagleBone
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Accessing the BeagleBone
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Useful accessories
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Summary
2
2. Software in the BeagleBone
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2. Software in the BeagleBone
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System software in the BeagleBone
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Distributions on the BeagleBone
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Installing a distribution in the BeagleBone
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Nonsystem software in the BeagleBone
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Summary
3
3. Building an LED Flasher
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3. Building an LED Flasher
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Setting up a foundation for the exercises
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Hello, World for the BeagleBone
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Flashing the LEDs
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Using the controls in a program
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Summary
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4. Refining the LED Flasher
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4. Refining the LED Flasher
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The I2C bus
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The I2C devices on the BeagleBone
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User interfaces
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Loading your first web page
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Summary
5
5. Connecting the BeagleBone to Mobile Devices
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5. Connecting the BeagleBone to Mobile Devices
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Mobile devices
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Connectivity options
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Full network connection options
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Protocol-specific connectivity
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Mobile device connections
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Carrier limitations
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Bluetooth wireless technology
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Profiles
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BLE options
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Near Field Communication and the BeagleBone
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Summary
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6. Recovering from the Mistakes
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6. Recovering from the Mistakes
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Symptoms of the mistakes
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Troubleshooting the BeagleBone
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Repairing the BeagleBone
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Summary
7
7. Interfacing with the BeagleBone
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7. Interfacing with the BeagleBone
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Electrical engineering in a nutshell
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Expansion headers
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Transistors
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Connecting LEDs to the BeagleBone
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Controlling relay with a BeagleBone
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Connecting switches to the BeagleBone
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I2C/SPI on the BeagleBone expansion connector
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Summary
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8. Advanced Software Topics
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8. Advanced Software Topics
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The BeagleBone programming with the C and Linux APIs
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User space versus kernel space on the BeagleBone
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Kernel drivers on the BeagleBone
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Device trees on the BeagleBone
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Pinmuxing on the BeagleBone
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Figuring out the pinmux on the BeagleBone
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The BeagleBone and real-time performance
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Summary
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9. Expansion Boards and Options
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9. Expansion Boards and Options
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The BeagleBone capes
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USB devices on the BeagleBone
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Summary
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A. The Boot Process
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A. The Boot Process
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What happens when the power is turned on
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Linux and beyond
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Alternative boot uses
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Summary
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B. Terms and Definitions
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B. Terms and Definitions
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Index
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Index

Controlling relay with a BeagleBone

While a transistor can be used to interface with devices that require more current or a higher voltage, a transistor is still electrically connected to the BeagleBone. A relay is a mechanical switch that is activated or deactivated by an electromagnet and can provide electrical isolation. There are a few potential hazards with controlling a relay. This applies to anything that has a coil such as a solenoid, motor, or even an electromagnet. As a group, they are known as inductive loads. Without going into the physics, switching an inductive load can result in voltage spikes, known as an inductive kickback, which can damage the transistors. The following are the points to consider when connecting to a relay:

  • Consider the current required by the relay. Compared to LEDs, relays can require more power. Check the relay specifications. Sometimes, relay specifies a coil resistance. You can use Ohm's law to figure out the current needed to drive it.

  • Relays come in...

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Tech Concepts
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Programming languages
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Learning BeagleBone
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