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Node RED and MQTT for IoT Projects: Build Visual Automation Workflows, Connect ESP32 Devices, Process Sensor Data, and Integrate Home Assistant
Paperback
Publisher: Independently Published
Published: Aug 19 2026
Pages: 268
Weight: 0.72
Height: 0.67 Width: 6.00 Depth: 9.00
Language: English
Turn Simple Electronics into Connected Systems That Can Monitor, Decide, and Respond
A temperature reading becomes far more useful when it can travel across a network, appear on a live dashboard, trigger an alert, switch an output, and become part of a larger connected system.
Node RED and MQTT for IoT Projects shows you how to make that happen.
Designed for newcomers who want practical results, this hands on guide takes you from basic communication concepts to complete working systems using Node RED, MQTT, ESP32 boards, Mosquitto, and Home Assistant.
Instead of learning each technology in isolation, you will see how the pieces fit together as one practical architecture.
Inside, you will learn how to:
Install and configure Node RED on a computer or Raspberry Pi
Create useful flows with Inject, Debug, Change, Switch, and Function nodes
Understand messages, payloads, JSON objects, and event driven logic
Set up and secure an Eclipse Mosquitto broker
Understand publishers, subscribers, topics, retained messages, QoS, and Last Will messages
Send information between different applications and embedded hardware
Connect an ESP32 board to WiFi and exchange messages across your network
Read temperature and humidity measurements from physical hardware
Filter incorrect readings and apply thresholds
Calculate values and combine readings from multiple sources
Create browser based monitoring interfaces with gauges, charts, indicators, and controls
Send commands to LEDs, relays, and other outputs
Keep displayed status synchronized with physical equipment
Create time based, motion based, and temperature based routines
Store measurements and examine historical trends
Bring connected equipment into Home Assistant
Protect your broker, editor, credentials, and network
Diagnose broken connections, topic problems, WiFi failures, and missing readings
Organize larger installations containing multiple microcontrollers
You will also build complete practical systems, including a WiFi temperature and humidity monitor, remote controlled light, motion and occupancy monitor, environmental alert system, room automation, historical measurement system, and multi board network.
The projects are introduced gradually. You first prove that one layer works, then add the next. This makes the system easier to understand and faults easier to find.
Whether you are experimenting with embedded electronics, creating a room monitoring system, learning message based communication, or preparing for larger connected technology projects, this book gives you a practical foundation you can continue expanding.
Start with a message. Follow it through the network. Turn it into something useful.
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