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Learning Javascript Robotics

Learning Javascript Robotics

By : Kassandra Perch
4.3 (6)
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Learning Javascript Robotics

Learning Javascript Robotics

4.3 (6)
By: Kassandra Perch

Overview of this book

There has been a rapid rise in the use of JavaScript in recent times in a variety of applications, and JavaScript robotics has seen a rise in popularity too. Johnny-Five is a framework that gives NodeBots a consistent API and platform across several hardware systems. This book walks you through basic robotics projects including the physical hardware builds and the JavaScript code for them. You'll delve into the concepts of Johnny-Five and JS robotics. You'll learn about various components such as Digital GPIO pins, PWM output pins, Sensors, servos, and motors to be used with Johnny-Five along with some advanced components such as I2C, and SPI. You will learn to connect your Johnny-Five robots to internet services and other NodeBots to form networks. By the end of this book, you will have explored the benefits of the Johnny-Five framework and the many devices it unlocks.
Table of Contents (11 chapters)
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Preface
Preface
What this book covers
What you need for this book
Who this book is for
Conventions
Reader feedback
Customer support
Free Chapter
1
1. Getting Started with JS Robotics
1. Getting Started with JS Robotics
Understanding JS Robotics, NodeBots, and Johnny-Five
Setting up your development environment
Hello, World! – Blinking an onboard LED
Summary
2
2. Working with Johnny-Five
2. Working with Johnny-Five
What you'll need for this chapter
How a Johnny-Five program works
Understanding events in Johnny-Five
Wiring up an external LED
Using the Read-Eval-Print-Loop (REPL)
Summary
3
3. Using Digital and PWM Output Pins
3. Using Digital and PWM Output Pins
What you'll need for this chapter
How GPIO pins work
Multiple pins with several LEDs
Using PWM pins with the Piezo element
Summary
4
4. Using Specialized Output Devices
4. Using Specialized Output Devices
What you'll need for this chapter
Outputs that require multiple pins
Checking compatibility with Johnny-Five
Obtaining documentation, wiring diagrams, and so on
Project – character LCD display
Summary
5
5. Using Input Devices and Sensors
5. Using Input Devices and Sensors
What you'll need for this chapter
How analog input pins work
Johnny-Five sensor events
Using basic inputs – buttons and potentiometers
Using sensors – Light and Temperature
Summary
6
6. Moving Your Bot
6. Moving Your Bot
What you'll need for this chapter
The different kinds of servos and motors
Special concerns when using motors and servos
Wiring up servos and motors
Creating a project with a motor and using the REPL
Creating a project with a servo and a sensor
Summary
7
7. Advanced Movement with the Animation Library
7. Advanced Movement with the Animation Library
What you'll need for this chapter
What is the Animation API?
Looking at the Animation API
Writing Servo Animations
Animation events
Summary
8
8. Advanced Components – SPI, I2C, and Other Devices
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8. Advanced Components – SPI, I2C, and Other Devices
What you'll need for this chapter
Why do we need the I2C and SPI protocols?
Exploring SPI (Serial Peripheral Interface) devices
Exploring I2C devices
External Devices
Summary
9
9. Connecting NodeBots to the World, and Where to Go Next
9. Connecting NodeBots to the World, and Where to Go Next
What you'll need for this chapter
Connecting NodeBots to the Web
Johnny-Five and the wide world of microcontrollers
Other JS libraries and platforms
Where to go from here
10
Index
Index

Why do we need the I2C and SPI protocols?

This is all starting to get really complicated, right? Why even bother? We have digital pins and analog pins; shouldn't reading values from these be enough?

Not when you go outside the realm of LEDs. Think about how much information goes into this text you're reading on a page (or, likely, a screen)! Bytes and bytes of information. This is true for many peripherals you'll use in Johnny-Five applications.

For instance, the accelerometer we'll be using—without the I2C protocol, it would use three analog pins. That's the majority of the analog pins on an Arduino Uno, and many platforms don't have analog pins at all! Not to mention the LCD we used in Chapter 4, Using Specialized Output Devices—without I2C, we have to correctly wire 11 different pins, six of which are separate data pins.

The complexity of data being sent and received is also an issue. There are sensors that send back data that doesn't fit in an analog range of 0-1024. There are output devices...

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