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How to View Modbus RS485 Data on the Web using Arduino & IoT

Name: How to View Modbus RS485 Data on the Web using Arduino & IoT
Rating: 4.6 (134 reviews)

Learn how to program an Arduino to read Modbus data and display it on a SmartPhone App and the Web using IoT Technology

Created byEmile Ackbarali

Last updated 5/2026

English

What you'll learn

Understand the Arduino Mega, Max485 module and ESP8266 Wifi module from a Hardware persepctive
Connect a Max485 module to an Anduino Mega
Connect an ESP8266 Wifi module to an Arduino Mega
Use the Arduino IDE to develop applications for the Arduino Mega
Write an Arduino Sketch application to connect to a Wifi Network
Write an Arduino Sketch application to implement a Modbus Master
Download and configure the Blynk smartphone app to display Modbus IoT data
Configure Thingspeak IoT service to display Modbus IoT Data

Course content

9 sections • 31 lectures • 2h 18m total length

The BIG Picture - This is What We Are Going to Do in the Course5:15
The end result of the entire project is shown in terms of the various components and how they interconnect with one another.
Accessing Attached Resources and Setting Optimal Video Resolution2:23
Viewing the Complete Setup on my Workbench2:38
The actual hardware setup is shown on my workbench to give a more accurate picture of the big picture goal.

The Arduino Mega 2560 and the I/O Connections That Will Be Used6:15
A look at the Arduino Mega 2560 and the pins that will be used in the project. The pins that are most important are the serial port pins for communication with the external devices.
Arduino Mega 2560 connection to Max485 Module4:23
The wiring of the Arduino Mega 2560 to the Max485 module is shown and the functions of the various connections explained.
A Look at the Modbus RS485 Temperature / Humidity Sensor6:19
The specifications of the Modbus RS485 Temperature / Humidity sensor are examined. The port settings, slave ID as well as the target Modbus registers to be read are identified.
A Look at the Arduino to Max485 to Sensor connection on my Workbench3:06
The actual physical connection is shown on the workbench. The connection of the Arduino Mega to the Max485 module and then the connection of the Max485 module to the Modbus RS485 Sensor.

Some Basics of the Arduino IDE5:50
A quick look at the Arduino IDE to show how to set up and download a simple sketch to the Arduino Mega.
Installing the Modbus Master Library and Setting up Code Sections3:35
The Modbus master Arduino library is installed to effect Modbus master comms, after which code comments are placed in the new sketch to keep the code readable with expansion.
Writing the Sketch for the Modbus Communication - Part 19:25
The writing of the sketch for the Modbus communication is started.
Writing the Sketch for the Modbus Communication - Part 24:52
The code is completed for the sketch that implements the Modbus communication.
Running the Modbus01 Sketch to verify Modbus Communication3:27
The sketch is compiled and downloaded to the Arduino to test for proper Modbus communication.

A Look at the ESP8266 and it's Breadboard Adapter and Where to Purchase3:13
The Amazon pages for the ESP8266 and it's breadboard breakout adapter are shown.
How to Connect the ESP8266 to the Arduino Mega6:00
Shows a downloadable wiring diagram with all wire connections from Arduino Mega to ESP8266 Wifi Module
A Look at the Physical Connections on the Work Bench2:01
A Look at how the Arduino Mega is connected to the ESP8266 on the actual Work Bench.

The Reason for Updating the Firmware on the ESP82663:28
The firmware on the ESP8266 must be updated to work with the Blynk system.
Downloading and Setting up the Flash Downloader and Firmware Files3:04
The files for the Flash Downloader and the Firmware are downloaded and unzipped and organised into folders.
Updating the Firmware on the ESP8266 Wifi Module using the Flash Downloader5:01
The wiring is changed temporarily and the flash downloader is used to update the firmware to version 1.1.

An Overview of the Blynk System and What We Are Going to Do in this Section2:53
An Overview of the Blynk System and What We Are Going to Do in this Section
Downloading and Installing the Blynk Libraries3:07
The Blynk libraries are downloaded from the website, unzipped and copied to the Arduino libraries folder for use in the IDE.
Writing a Sketch to Test the Wifi Connection and Link to the Blynk App8:53
The sketch that is written sends increments a value and sends that value to the Blynk App.
Configuring a Test Blynk App Project to Receive Data from the Arduino6:13
A test project is created in the Blynk App in order to test to see if data is being received from the Arduino.

The Modbus Code is merged with the Blynk Test Code to create a new Sketch6:12
The modbus code is combined with the Blynk code to form a new sketch.
Modifying the Blynk App Project and Testing the IoT System3:10
The Blynk App project is modified and then the merged Arduino sketch is downloaded into the Arduino and the entire IoT system tested.
Reviewing our Blynk IoT Project3:29
The project that was just completed using the Blynk App is reviewed using the project diagram from the introduction.

An Overview of How the Thingspeak IoT Systems Works3:24
We look at the operation of the Thingspeak IoT server by comparing it to the Blynk system, looking at similarities and differences.
Signing up for a Thingspeak Account and Creating a New Channel4:14
We create a new account on Thingspeak and then set up and new channel with two fields, one for temperature and for for humidity.
Writing the Code to Send Modbus Data to the Thingspeak IoT Server - Part 17:39
Writing the Code to Send Modbus Data to the Thingspeak IoT Server - Part 1
Writing the Code to Send Modbus Data to the Thingspeak IoT Server - Part 24:18
Writing the Code to Send Modbus Data to the Thingspeak IoT Server - Part 2
Running and Testing the Code to Write Modbus Data to the Thingspeak IoT Server2:51

Requirements

Basic working knowledge of the Modbus RTU protocol.
Familiarity with the installation of software applications on the Windows OS platform
Elementary understanding of the "C" programming language
Basic understanding of elementary electronics

Description

If you work in the Automation Industry, you will know that automation equipment is very expensive. And many a time, especially for small applications, you simply cannot justify the use of very expensive equipment.

This is where the Arduino comes in!

The Arduino development board allows you to create very simple, but very powerful, Modbus master or slave devices through the use of relatively simple "C" programming. With the Arduino, you have full custom control over the program design allowing you to create very lean and very efficient devices for very specific purposes.

Put simply, mastering Modbus on the Arduino is going to take your skill level and value in the Automation Industry to a whole new level.

That is what this course is going to do. At the end of the course, you will know how to:

1. Choose the appropriate Arduino hardware.

2. Interconnect Arduino hardware with other add-on hardware.

3. Write "C" applications to implement Modbus master and slave functionality.

4. Use software and hardware to test each application that you write.

All of the programs written in the course are freely downloadable and give you a perfect starting point for further development. At the end of the course, you will have the knowledge to create your own products, your own custom Modbus master and slave hardware.

Looking forward to seeing you on the inside!

Who this course is for:

Electrical Engineers
Electrical Technicians
Electrical Tech or Engineering Students
Process Control Technicians and Engineers
Process Automation Engineers
Programmers working in the Process Automation field

How to View Modbus RS485 Data on the Web using Arduino & IoT

What you'll learn

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Course content

Introduction3 lectures • 10min

Building the Arduino Modbus Network - The Hardware Setup4 lectures • 20min

Building the Arduino Modbus Network - Writing The Program Code5 lectures • 27min

Connection of the Arduino Mega to the ESP8266 Wifi Module3 lectures • 11min

Updating the Firmware on the ESP8266 Wifi Module3 lectures • 12min

Linking the Arduino Mega with the Blynk SmartPhone App4 lectures • 21min

Combining the Modbus Code with the Blynk Test Code to create the IoT System3 lectures • 13min

Our 2nd IoT Project - Connecting the Arduino to the Thingspeak IoT Server5 lectures • 22min

Bonus Section - How to Always get the Lowest Prices for my Courses1 lecture • 2min

Requirements

Description

Who this course is for: