Book Image

Practical Node-RED Programming

By : Taiji Hagino
5 (1)
Book Image

Practical Node-RED Programming

5 (1)
By: Taiji Hagino

Overview of this book

Node-RED is a free and open source flow-based programming tool used to handle IoT data that allows programmers of any level to interconnect physical I/O, cloud-based systems, databases, and APIs to build web applications without code. Practical Node-RED Programming is a comprehensive introduction for anyone looking to get up to speed with the Node-RED ecosystem in no time. Complete with hands-on tutorials, projects, and self-assessment questions, this easy-to-follow guide will help you to become well versed in the foundations of Node-RED. You’ll learn how to use Node-RED to handle IoT data and build web applications without having to write complex code. Once you’ve covered the basics, you’ll explore various visual programming techniques and find out how to make sample flows as you cover web development, IoT development, and cloud service connections, and finally build useful real-world applications. By the end of this book, you’ll have learned how to use Node-RED to develop a real-world application from scratch, which can then be implemented in your business.
Table of Contents (19 chapters)
Section 1: Node-RED Basics
Section 2: Mastering Node-RED
Section 3: Practical Matters

Getting sensor data from the sensor module on the Raspberry Pi

In this chapter, we will learn how to handle the data acquired from the sensor device with Node-RED on the Raspberry Pi and publish the data to an MQTT broker.

For the sensor device, we will use the temperature/humidity sensor used in Chapter 5, Implementing Node-RED Locally. See each step in Chapter 5, Implementing Node-RED Locally, for details about connectivity and how to enable the sensor device on the Raspberry Pi.

Prepare to connect your temperature/humidity sensor to your Raspberry Pi. This is the edge device. You have already purchased and configured your edge device in Chapter 5, Implementing Node-RED Locally. Light sensors are not used in this chapter: