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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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10
Index

How GPIO pins work

If we look at our last project, we can observe from the code that we're writing values to an Led object in Johnny-Five, and it's changing the state and brightness of an LED. How does this work? While the in-depth details are beyond the scope of this book, we will go a little into how this works; this uses the concept of GPIO, or General-Purpose Input/Output, pins.

A GPIO pin is a pin that provides electric current to or reads electric current from a circuit. In our last project, we used this to provide varying levels of power to our LED. These pins can be configured by users (that's us!) to be used as input (read electric current) or output (provide electric current). For now, we're going to focus on the output pins, of which there are two main types: Digital and PWM.

Digital output pins

Digital output pins are only capable of providing two levels of electric current to our circuits: 1 and 0, HI and LOW, or ON and OFF. This means if we plug an LED into...

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