Industrial Modbus to MQTT Converter Kit with ESP32 + LED
Advanced Industrial Modbus to MQTT Gateway Kit with ESP32, MAX485 & OLED
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Bring legacy industrial sensors into the cloud by converting their Modbus RTU data into MQTT messages, displayed on a crisp OLED screen and logged to an SD card with precise timestamps. This kit equips you to build a production-grade IoT gateway that bridges the factory floor to cloud dashboards, ideal for smart manufacturing projects and industrial automation portfolios.
What You'll Build
A reliable Modbus-to-MQTT converter that polls any Modbus RTU slave device, formats readings as JSON, and publishes to any MQTT broker (like Mosquitto or AWS IoT Core). The onboard OLED shows live register values and connection status, while the microSD logs all transactions with RTC timestamps for audit trails — exactly what you need when integrating decades-old industrial sensors into modern IoT stacks.
What You'll Learn
- Implement Modbus RTU master communication over RS485 using ESP32 and the MAX485 transceiver.
- Parse Modbus register data and structure it as MQTT payloads with JSON formatting.
- Set up a real-time clock (DS3231) and log sensor data to a microSD card with timestamps for industrial traceability.
- Design an industrial-grade power supply with the buck converter and protect signal integrity inside a DIN‑rail enclosure.
Kit Contents
| Component | Quantity |
|---|---|
| ESP32 Dev Board | 1 |
| MAX485 RS485 | 1 |
| DS3231 RTC | 1 |
| MicroSD Module | 1 |
| 0.96in OLED | 1 |
| LM2596 Buck Converter | 1 |
| 120Ω Resistors | 5 |
| 10kΩ Resistors | 5 |
| 100nF Caps | 10 |
| PCB Prototype Board | 2 |
| DIN Rail Enclosure | 1 |
| 12V Adapter | 1 |
| Soldering Iron | 1 |
| Solder Wire | 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
Final-year B.Tech ECE and EEE students building smart factory IoT gateways, participants in the Smart India Hackathon tackling industrial automation challenges, and embedded engineers at NITs, IITs, and VIT prototyping legacy equipment connectivity. It also serves ATL Tinkering Labs that want to demonstrate real industrial protocols with a genuine Modbus-to-MQTT data pipeline.
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 on the box to open the AI companion — it knows every connection and register mapping for this kit. If you need extra help, drop a WhatsApp message to our team; we'll unblock you within hours.
What Modbus devices can I connect to this kit?
The MAX485 chip handles any standard Modbus RTU slave over RS485 — PLCs, energy meters, temperature sensors, flow meters — as long as you have the device’s Modbus register map. You’ll learn to configure the polling sequence and extract holding or input registers.
Does this kit support Modbus TCP or only RTU?
This kit focuses on Modbus RTU over RS485. However, the ESP32 firmware can be extended to bridge RTU‑to‑TCP using Modbus TCP libraries if your project requires it. The AI companion includes guidance for such advanced customization.
Is the soldering iron included, and how much soldering is needed?
Yes, a basic soldering iron and solder wire are included. Around 60% of the connections require soldering onto the PCB prototype board. We provide a detailed wiring diagram, and the AI companion walks you through each joint.
MAX485 RS485 transceiver reads Modbus RTU registers from industrial sensor and republishes to MQTT via ESP32 WiFi.
What's in this kit
Choose your assembly option:
- Soldering Kit — 25W soldering iron, 60/40 solder wire, flux, and small perfboard for permanent assembly.
- Breadboard Combo — 800-point full-size breadboard with 65-piece jumper wire pack for solderless prototyping.
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