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Node-RED and ESP32 Project

Name: Node-RED and ESP32 Project
Rating: 4.6 (317 reviews)

Design and build an automated control system using Node-RED and the ESP32

Created byDr. Peter Dalmaris

Last updated 11/2023

English

What you'll learn

Node-RED, the lightweight graphical programming tool.
ESP32, the powerful low-cost microcontroller with Wifi that you can program with the Arduino IDE.
MQTT Mosquitto broker, for reliable messaging between the ESP32 and Node-RED.
Use any Raspberry Pi as a host for Node-RED and the MQTT Mosquitto broker.
How to combine Node-RED, MQTT, the Raspberry Pi, and the ESP32 to create a complete automated control application.
Use Javascript inside Node-RED to process sensor inputs and calculate actions.

Course content

17 sections • 91 lectures • 9h 58m total length

01.10 What is this course about?8:31
01.20 Software requirements6:19
01.30 Hardware requirements7:58
Select flexible, low-cost hardware for the Node-RED ESP32 project, using Wi-Fi-enabled controllers (ESP32, Raspberry Pi) and generic sensors like DHT22 with simple motor control.
01.40 How to make the most out of this project3:16
01.50 Node-RED versions (watch before you continue)4:35
Please download the project archive0:05

05.10 Introduction to Node-RED, examples and documentation9:07
05.20 Install Node-RED on the Raspberry Pi6:24
05.30 Node-RED settings and configuration11:05
05.35 Editor walkthrough8:07
05.40 Nodes10:30
Explore Node-RED basics for ESP32 projects by configuring nodes, building simple flows, using the debug and inject tools, and installing third-party dashboards on a Raspberry Pi.
05.45 Node groups4:49
05.50 Flows17:09
05.60 Messages18:51
05.65 Variables and context22:43
05.100 The "complete" node3:33
Learn how the complete node in Node-RED links to other nodes and fires when that node completes, passing the message payload for reuse; deploy, test, and observe in debug window.
05.110 The "catch" node2:13
05.120 The "linkout" and "linkin" nodes3:14
05.130 The "switch" node2:32
05.140 The "range" node2:45
05.150 The "delay" node4:28
05.160 The "trigger" node2:30
05.170 The "RBE" (Report by Exception) node2:27

07.10 Quick introduction to MQTT10:05
07.20 Install MQTT Mosquitto on the Raspberry Pi3:17
Install the mosquitto broker and clients on a Raspberry Pi via apt, start the service, verify it runs, and review the configuration file for future security and graphical client use.
07.30 MQTT sub and pub examples7:59
07.40 Mosquitto configuration and authentication9:03
Configure mosquitto to require client authentication by using a password file, set allow_anonymous false, and encrypt passwords with mosquitto_passwd, then restart the service.
07.60 MQTT authenticated sub and pub examples4:15
Configure the mosquito broker to require authentication and demonstrate authenticated mqtt subscribers and publishers. Verify messages flow between authenticated clients on a Raspberry Pi and prepare for Node-RED integration.

10.10 Voltage sensing demonstration4:34
Demonstrate voltage sensing with two voltage dividers to monitor motor and MCU voltages, including resistor configurations, simulations, tolerances, and future telemetry and alerts.
10.20 Circuit review and simulation10:39
Review the completed Node-RED and ESP32 circuit, focusing on a voltage divider and resistor values chosen via a simulator to protect the ESP32 while measuring motor and USB voltages.
10.30 Sketch review9:26
10.40 Node Red flow review5:05
Review the second version of the Node-RED flow for the ESP32 project, wire topics for MCU and motor voltage, and display formatted readings on the voltages dashboard.
10.50 Review and planning ahead3:27

11.10 Record terrarium data in a Google sheet review2:46
Extend the node red flow to log terrarium telemetry from the ESP32 into a Google Sheet. Update records on motor state changes or at one minute to track humidity.
11.20 The GSheet node and installation6:52
Learn to install and configure the Google Sheets node in Node-RED, including Google Drive APIs, credentials setup, and spreadsheet ID handling to read or append data in flows.
11.30 Setup Google Sheet and credentials7:56
Set up a Google sheet for a node-red and ESP32 project by creating a Google Cloud project, enabling Drive and Sheets APIs, generating service account credentials, and sharing the sheet.
11.40 Update the Node Red flow19:15
11.50 Test the new flow, review and next step5:08

Requirements

Be familiar with the Arduino and ESP32.
Be familiar with Raspberry Pi.
Be familiar with Javascript.
Be comfortable on the command line.
Be able to assemble simple circuits.
Not be afraid to make a mistake (and fix it).

Description

Updated December 2022 to support Node-Red version 3

In December 2022, we added a new section with eight lectures that cover Node-RED version 3.

With these lectures, you will learn how to upgrade your Node-RED instance to version 3 and use the most important new and updated features.

Updated June 2022 to support Node-Red version 2.2.2+ and Node.js 16.

More details about this update: We have added ten new lectures that show you how to update Node-Red to version 2.2.2, and Node.js to version 16, as well as how to use several of the new nodes that come with Node-Red 2.

There's also a lecture showing you how to complete this project without having to set up an actual terrarium so that you can learn without the mess.

This course teaches you how to design and build an automated control system using Node-RED and the ESP32.

This course will guide you through the construction of an automated control system. The deliverable is a Terrarium controller.

Along the way, you will learn a great deal about useful technologies such as the Node-Red programming environment and MQTT.

This course is perfect for makers familiar with the ESP32 and interested in learning how to use it alongside Node-RED.

Node-RED is a lightweight graphical programming tool. You can use it to join various hardware and software components and create applications such as the automated terrarium controller in this course.

Node-RED is used in a range of settings. Makers create home automation applications, and organisations use it to automate their factory floors, among many other possibilities.

The ESP32 is a powerful low-cost microcontroller with built-in Wi-Fi that we can program with the familiar Arduino IDE. Its "call to fame" is that it makes it easy for anyone familiar with the Arduino to leverage their knowledge and create gadgets that need more memory and processing power than what the Arduino Uno can provide, in addition to Wifi and Bluetooth. All this at a lower price point.

Who this course is for:

Anyone familiar with the Arduino, ESP32 and Raspberry Pi.
Recent graduates of ESP32 for Arduino Makers.
Recent graduates of Raspberry Pi Full Stack.
Anyone interested in learning how to create a complete project using Node-RED, ESP32 and MQTT.

Node-RED and ESP32 Project

What you'll learn

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Course content

Introduction6 lectures • 31min

02 - The completed controller circuit6 lectures • 33min

04 - Prepare your Raspberry Pi2 lectures • 10min

05 - Getting started with Node-RED17 lectures • 2hr 12min

06 - Node-RED dashboard8 lectures • 51min

07 - MQTT on the Raspberry Pi with Mosquitto5 lectures • 35min

08 - MQTT and Node-RED experiments5 lectures • 32min

09 - Terrarium project, prototype 1: soil moisture sensing6 lectures • 46min

10 - Terrarium project, prototype 2: Voltage sensing5 lectures • 33min

11 - Terrarium project, prototype 3: Google Sheet data logging5 lectures • 42min

Requirements

Description

Who this course is for: