7. Advanced Movement with the Animation Library | Learning Javascript Robotics

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Learning Javascript Robotics

By : Kassandra Perch

4.3 (6)

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.

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. 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. 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. 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. 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. 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. 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. 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. Advanced Components – SPI, I2C, and Other Devices

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. 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

Index

Index

Looking at the Animation API

The Animation API has its own vocabulary—it may be familiar to the readers who have done some animation work. It also has a few different ways to interact with it, and we'll explore these ways before diving in and writing our own projects.

Learning the terminology

There are two parts that make up any servo animation in Johnny-Five: a target and one or more segments. The target is either a servo or an array of servos. We'll go into the programmatic differences between a servo and a servo array in our first project; the basic point is that a ServoArray object in Johnny-Five allows a logical grouping and the manipulation of multiple servos—a leg, for instance, would be a logical use of a ServoArray object.

A segment is the programmatic description of a piece of animation. It is comprised of a few pieces of information: a duration, cue points, and keyframes.

A keyframe is a description of the position of the target at a given point. A keyframe has no concept of time...

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Programming languages

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