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Learning Javascript Robotics

You're reading from   Learning Javascript Robotics Design, build, and program your own remarkable robots with JavaScript and open source hardware

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Product type Paperback
Published in Nov 2015
Publisher
ISBN-13 9781785883347
Length 160 pages
Edition 1st Edition
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Author (1):
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Kassandra Perch Kassandra Perch
Author Profile Icon Kassandra Perch
Kassandra Perch
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Table of Contents (11) Chapters Close

Preface 1. Getting Started with JS Robotics 2. Working with Johnny-Five FREE CHAPTER 3. Using Digital and PWM Output Pins 4. Using Specialized Output Devices 5. Using Input Devices and Sensors 6. Moving Your Bot 7. Advanced Movement with the Animation Library 8. Advanced Components – SPI, I2C, and Other Devices 9. Connecting NodeBots to the World, and Where to Go Next Index

Writing Servo Animations


As we discussed in the last section, an animation in Johnny-Five is created and then you enqueue segments that run first-in, first-out. We're going to go from the inside out in our exploration of creating an animation: first, we'll learn about writing keyframes, then segments, and finally we'll explore the Animation object.

Writing keyframes

Writing keyframes are at the core of the Animation API—the power of this API is its ability to tween between our keyframes. Each keyframe is an object, and you'll pass your keyframes into your segment via an array. Remember: you'll want to write a keyframe for each of your cue points.

The keyframe object

As each keyframe is an object, we have access to a few properties that we can establish for each one:

Keyframe

Properties

degrees

degrees is what the name implies; the degree you want the servo to be at when the keyframe is reached. It should be an integer value between 0 and 180 inclusive.

step

step is similar to degrees...

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