Hands-on robotics with JavaScript : build robotic projects using Johnny-five and control hardware with Javascript and Raspberry Pi / Kassandra Perch.

Format:

Book

Author/Creator:

Perch, Kassandra, author.

Language:

English

Subjects (All):

Robots--Programming.

Robots.

JavaScript (Computer program language).

Physical Description:

1 online resource (206 pages) : illustrations

Edition:

1st edition

Place of Publication:

Birmingham ; Mumbai : Packt, 2018.

System Details:

text file

Biography/History:

Perch Kassandra: Kassandra Perch is an open web developer and supporter. She began as a frontend developer and moved to server-side with the advent of Node. js and was especially enthralled by the advance of the NodeBots community. She travels the world speaking at conferences about NodeBots and the fantastic community around them.

Summary:

Leverage Raspberry Pi 3 and different JavaScript platforms to build exciting Robotics projects Key Features Build robots that light up and make noise Learn to work with Raspberry Pi 3 and JavaScript Connect your Johnny-Five projects to external APIs and create your own IoT Book Description There has been a rapid increase in the use of JavaScript in hardware and embedded device programming. JavaScript has an effective set of frameworks and libraries that support the robotics ecosystem. Hands-On Robotics with JavaScript starts with setting up an environment to program robots in JavaScript. Then, you will dive into building basic-level projects such as a line-following robot. You will walk through a series of projects that will teach you about the Johnny-Five library, and develop your skills with each project. As you make your way through the chapters, you'll work on creating a blinking LED, before moving on to sensors and other more advanced concepts. You will then progress to building an advanced-level AI-enabled robot, connect their NodeBots to the internet, create a NodeBots Swarm, and explore MQTT. By the end of this book, you will have gained hands-on experience in building robots using JavaScript What you will learn Install and run Node.js and Johnny-Five on Raspberry Pi Assemble, code, and run an LED project Leverage JavaScript libraries to build exciting robots Use sensors to collect data from the world around you Employ servos and motors to make your project move Add internet capabilities to your Johnny-Five project Who this book is for Hands-On Robotics with JavaScript is for individuals who have prior experience with Raspberry Pi 3 and like to write sketches in JavaScript. Basic knowledge of JavaScript and Node.js will help you get the most out of this book.

Contents:

Cover

Title Page

Copyright and Credits

Dedication

Packt Upsell

Contributors

Table of Contents

Preface

Chapter 1: Setting Up Your Development Environment

Technical requirements

What is the Raspberry Pi?

Microcontrollers

General-Purpose Input/Output (GPIO) pins

Debian and Raspbian

Johnny-Five and Raspi-IO

So, the Pi is technically a microcontroller...

...but it is also a computer!

How we will use the Raspberry Pi

Taking advantage of all that the Raspberry Pi has to offer!

Johnny-Five - letting us code hardware in Node.js

Installing the operating system

Downloading Raspbian Lite

Burning the image to an SD card

Editing files on the SD card

Booting up the Pi

SSHing from a Linux or Mac

SSHing from Windows

Setting up your password and hardware interfaces

First things first - change your password!

Updating the Raspberry Pi

Turning on the hardware interfaces

Installing Node.js, Johnny-Five, and Raspi-IO

Installing Node.js and npm

Detecting your version of ARM processor

Installing Johnny-Five and Raspi-IO

Summary

Questions

Further reading

Chapter 2: Creating Your First Johnny-Five Project

Creating a project folder

Setting up npm to manage our modules

Getting started with Johnny-Five and Raspi-IO

Gathering resources and documentation

Taking a look at the LED-blink project

Raspberry Pi pin numbers

Wiring up an LED

Putting together and attaching the cobbler

Attaching the resistor and LED

Making the LED blink

Putting your code on the Raspberry Pi

Running your code

Chapter 3: Building Interactive Projects with RGB LED

Looking at the LED and LED.RGB API

The LED object

The Led.RGB object.

PWM pins and GPIO expanders

How do PWM pins work?

Why we need a GPIO expander

Wiring up our GPIO expander and RGB LED

Bringing in other node packages

Project - building a rainbow

Using the color npm module

Getting our Johnny-Five code started

The REPL - a powerful tool in Johnny-Five

How does the REPL work?

Adding our RGB LED to the REPL

Controlling our LED from the command-line interface

Chapter 4: Bringing in Input with Buttons

Using inputs in robotics projects

Digital versus analog input

How to handle analog input with the Raspberry Pi

Analog GPIO expanders

Using input devices with digital interfaces

How Johnny-Five handles input

The structure of a typical Johnny-Five project

The beginning - including libraries and creating our board object

The board ready event handler

Constructing our component objects

Input event handlers and output device manipulation

The Johnny-Five button object

The button object

Button events

Wiring up buttons

Putting a button on a breadboard

Using a pull-down resistor

Adding buttons to our RGB LED project

Wiring everything up

Using the power and ground side rails

Wiring up the buttons

Button 1 - stop and start rainbow

Refactoring the rainbow cycle

Button 2 - next color

Chapter 5: Using a Light Sensor to Create a Night-Light

Using an analog sensor with the Pi

Finding the right sensors for your Pi project

I2C devices

SPI

How to determine if your sensor will work with Johnny-Five

The ambient light sensor

Wiring up the sensor

Writing a program to get readings and print them to the command line

The Johnny-Five sensor events.

Handling sensor data in the event handler

Using and formatting Johnny-Five sensor data

Using .scaleTo() and .fscaleTo() to fine-tune measurements

Printing sensor data to the command line

Using barcli to make the data easier to see

Importing barcli and constructing our barcli graph

Getting the bar graph to update

Creating our night-light

Wiring up the LED

Coding this project

Chapter 6: Using Motors to Move Your Project

More about motors

How to control a motor with a microcontroller

Preparing for a motor-driven project with Raspberry Pi

Putting the hat together

Putting the hat on the Pi

The Johnny-Five motor object

Constructors for our hat

Functions that move the motor

Adding REPL control

Loading and running your motor

Troubleshooting your motorized projects

Project - cat toy

Putting a piece of paper on the motor shaft

Coding the randomness to start/stop the motor

Project - using two gearbox motors and the motors object

Wiring up your TT motors

The motors Johnny-Five object

Writing some functions

Running our motors project

Chapter 7: Using Servos for Measured Movement

Differences between motors and servos

Calculated movements

Regular versus continuous servos

Powering servos and motors

Getting a servo working with Johnny-Five

The Johnny-Five servo object

Wiring the servo to our PWM hat

Coding your first servo sweep

Project - two servos and the REPL

Wiring up a second servo

Using the Johnny-Five servos object

Adding the Servos object to our code

Adding in REPL functionality

Playing with our servos on the command line

Project - light meter with the servo

Adding in the light sensor.

Making the servo into a meter

Coding the project

Running and using our light meter

Project - the continuous servo

Wiring up the servo

Continuous servo constructor and methods

Using the REPL with the continuous servo

Playing with the continuous servo in the REPL

Chapter 8: The Animation Library

Animating movement

Why we need the animation library

Moving servos with true precision

Implicit use of the animation library

Using servo.to() to implicitly create an animation

Playing with implicit animations

Playing with implicit animations, take two

The terminology of the animation library

The construction of the animation object

Creating the animation object

Planning out the animation sequence

Creating keyframes

Using null and false as positions in keyframes

Programming our keyframes

Setting cue points and duration

Putting it all together to make an animation

Watching your animation at work

Easing into your servo animations

How easing fits into an animation segment

Adding easing to our first animation

Easing an entire animation segment

Learning more about queuing and playing animation segments

Looping animation segments

Changing the speed of animation segments

Playing, pausing, and stopping animation segments

Tying it all together in the REPL

Chapter 9: Getting the Information You Need

Why connect your NodeBots to the internet?

Using the power of npm modules

Using the data you collect

Some things to keep in mind

Getting weather data on our Pi with OpenWeatherMap

Getting an OpenWeatherMap API key

Bringing in request

Parsing the response

Building a weather dashboard with an LCD

Adding an LCD to the Pi

The LCD object.

Constructing our LCD

Setting up the LCD

Printing to and clearing the LCD

Coding it all together

Project - scraping data from websites with your Pi

Scraping downforeveryoneorjustme.com for johnny-five.io

Making the HTTP request

Using Cheerio to get the element we want

Parsing the HTML and showing the result

Chapter 10: Using MQTT to Talk to Things on the Internet

IoT device communications

Long polling

Websockets

MQTT - an IoT PubSub protocol

The basics of MQTT

Setting up MQTT on the Pi with AdafruitIO

Creating an account and a feed

Subscribing to the feed using the mqtt npm module

The mqtt module

The dotenv module

Testing our connection

Project - adding an LCD and button to see and send MQTT events

Wiring it all up

Project - social media notifier bot with IFTTT

Getting started with IFTTT

Linking IFTTT to Adafruit

Setting up feeds for your social media MQTT messages in AdafruitIO

Creating our IFTTT Applets

Wiring up our project

Coding our social media notifications to show on the LCD

Running your social media bot

Chapter 11: Building a NodeBots Swarm

Project - connecting multiple NodeBots

Optional - setting up a second Raspberry Pi

Setting up your project files and folders

If you're using one Pi

If you're using two Pis

Adding a light sensor to the Pi

Creating an MQTT broker on the Pi

Programming the MQTT client - have the Pi Report Home

Running our MQTT project

Expanding your NodeBots knowledge

Using Johnny-Five on other boards

Figuring out pin numbers.

Checking the platform support page.

Notes:

Includes index.

Includes bibliographical references.

Description based on print version record.

ISBN:

9781789346732

1789346738

OCLC:

1055555805