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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

Exploring SPI (Serial Peripheral Interface) devices


Serial Peripheral Interface (SPI) is a protocol to be used with certain devices in Johnny-Five and in general, robotics. It came about as a response to typical serial connections (which you don't see often in hobbyist robotics anymore), which were asynchronous in nature. This led to a lot of overhead, so SPI was developed as a way to ensure data was sent and received in a way that was efficient.

Tip

Keep in mind that when we talk about synchronous/asynchronous in this context, we are NOT talking about it as we would in JavaScript. You can still write async JavaScript functions around SPI methods!

How SPI works

In typical serial connections, you have a line from which data goes out (TX) and a line to which the data comes in (RX), and this makes communication difficult. How does the receiver know how fast the sender would be sending bytes, and when are they done sending? This lack of a synchronized time clock is what we mean when we say asynchronous...

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