Modbus RTU First Read Kit with Arduino Uno
Modbus RTU First Read Kit — Industrial Communication with Arduino Uno
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
This kit puts a real Modbus RTU register reading on your workbench in under four hours. You will wire a MAX485 RS485 transceiver to an Arduino Uno, poll a slave device, and display live register values on a 16x2 LCD. It is a clean, scaffolded introduction to the protocol that powers factory floors, energy meters, and building automation systems across India.
What You'll Build
You will assemble an Arduino-based Modbus master that reads a holding register from any RS485 slave — a PLC simulator, an energy monitor, or the reference sketch we provide. The value updates every second on the LCD screen through I2C, so you can see the read cycle working in real time. By the end, you have a portable unit running off a 9V battery that you can connect to industrial gear during your next lab session or hackathon.
What You'll Learn
- How to configure a MAX485 transceiver for half-duplex RS485 differential signalling
- Writing Arduino code that sends Modbus RTU function 03 (Read Holding Registers) frames
- Parsing binary response packets into integer values with CRC validation
- Displaying industrial sensor data on an I2C LCD without blocking the Modbus poll loop
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| MAX485 RS485 | 1 |
| 16x2 LCD | 1 |
| I2C Backpack | 1 |
| 120Ω Resistors | 3 |
| 10kΩ Resistors | 5 |
| 100nF Caps | 5 |
| 400-pt Breadboard | 1 |
| M-M Wires | 20 |
| 9V Battery Snap | 1 |
Why Buy This Kit Instead of Sourcing Parts Separately
| Factor | Sourcing Separately | Compoden Kit |
|---|---|---|
| Compatibility checks | You verify every part | Pre-tested as a system |
| Build support | Forums and scattered tutorials | AI companion trained on this exact project |
| Time to first working build | Days of debugging | Hours, with step-by-step guidance |
| Shipping coordination | Multiple sellers, multiple delays | One shipment from Bengaluru in 3-5 days |
Who This Kit Is For
This kit fits perfectly into CBSE Class 11–12 physics and informatics practices curricula, B.Tech ECE/EEE communication lab coursework, and Smart India Hackathon industrial IoT tracks. ATL tinkering labs use it to introduce students to wired sensor networks, while IIT, NIT, VIT and BITS Pilani undergraduates pick it up before internship placements in automation companies.
Built and Backed by Compoden
Every Compoden kit ships with an AI build companion trained on this exact project — accessible via a QR code on the box, with WhatsApp and email backup. We've spent 10 years building projects for makers, schools, and institutions across India. If a part fails because of a manufacturing defect, replace it free within 7 days.
What if I get stuck during the build?
Scan the QR code inside the box to launch the AI companion, which has been preloaded with every wiring diagram, troubleshooting step, and Modbus test script. WhatsApp support is also available if you prefer a human touch.
Do I need a separate Modbus slave to use this kit?
No. The kit includes an example Arduino sketch that emulates a Modbus RTU slave device on your computer or a second Arduino, so you can complete the full read cycle without any external hardware.
Can this kit read registers from real industrial devices like energy meters or PLCs?
Yes, the MAX485 transceiver and Arduino Uno are electrically compatible with standard Modbus RTU slaves. Once you confirm the slave’s baud rate, parity, and register address, you can adapt the provided code to read live field data.
Is any soldering required, or is it completely plug-and-play?
All connections use a 400-point breadboard and male-to-male jumper wires. No soldering is necessary; the LCD I2C backpack is pre-soldered to the display, so you simply plug everything together.
MAX485 RS485 transceiver reads a Modbus RTU register from a slave device. LCD shows register value.
What's in this kit
- Arduino Uno R3
- MAX485 RS485
- 16x2 LCD
- I2C Backpack
- 120Ω Resistors x3
- 10kΩ Resistors x5
- 100nF Caps x5
- 400-pt Breadboard
- M-M Wires x20
- 9V Battery Snap
Other projects you can build
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items