Industrial IoT Gateway: ESP32 Modbus RTU to AWS Cloud with LED Kit
Industrial IoT Gateway: ESP32 Modbus RTU to AWS Cloud with Status LED
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Imagine a pharmaceutical cold storage floor where five temperature zones are continuously monitored, and every reading arrives on your AWS dashboard in real time - without a single wire touching a PC. This kit lets you build exactly that: a rugged DIN rail-mounted industrial fieldbus bridge that picks up Modbus RTU data from five slave devices (or DS18B20 probes), timestamps it with a precision RTC, displays it locally on an OLED, logs to microSD, and publishes it securely to AWS IoT Core over MQTT TLS. It's a complete wired-to-cloud data pipeline that mirrors what production-grade IIoT systems do.
What You'll Build
You will assemble and code a standalone gateway device that acts as a Modbus RTU master, polling connected temperature sensors and any RS485 slave, aggregating their data, and pushing it to AWS IoT Core with end-to-end encryption. The gateway is housed in a DIN rail enclosure, powered by a 12V supply stepped down to 3.3V/5V, and provides local readout on a 0.96-inch OLED. The onboard LED indicates cloud connection status, so you can monitor health at a glance. In the end, you get a factory-floor-ready bridge that can be deployed inside a control panel and monitored remotely.
What You'll Learn
- Implement Modbus RTU master communication over RS485 using MAX485 transceiver and ESP32's UART
- Design a secure MQTT TLS session to AWS IoT Core, including certificate-based authentication
- Integrate DS3231 RTC for accurate timestamping and NTP synchronization over Wi-Fi
- Build a multi-voltage power rail with LM2596 buck converter and manage 3.3V/5V distribution
Kit Contents
| Component | Quantity |
|---|---|
| ESP32 Dev Board | 1 |
| MAX485 RS485 | 1 |
| DS18B20 Probe | 5 |
| DS3231 RTC | 1 |
| MicroSD Module | 1 |
| LM2596 Buck Converter | 1 |
| 0.96in OLED | 1 |
| 120? Resistors | 5 |
| 100nF Caps | 10 |
| PCB Prototype Board | 3 |
| DIN Rail Enclosure | 1 |
| 12V 3A PSU | 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
B.Tech ECE/EEE students tackling final-year industrial IoT or smart factory projects; Smart India Hackathon teams prototyping connected cold chain or energy monitoring solutions; ATL Tinkering Lab mentors wanting an advanced, real-world protocol integration exercise; professionals in pharma or manufacturing who need to quickly evaluate an AWS IoT bridge before scaling to production.
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 access the AI companion that has full schematics, step-by-step wiring diagrams, and troubleshooting for this kit. If you still need help, message us on WhatsApp and we'll guide you through within a few hours.
Is this kit suitable for connecting to actual Modbus slave devices on my plant floor?
Yes. The MAX485 interface can connect to any standard Modbus RTU slave. You can replace the included DS18B20 probes with your own temperature transmitters, PLCs, or energy meters - the firmware supports up to five slave IDs and can be extended easily.
Can I use a cloud platform other than AWS IoT Core?
The firmware is structured around MQTT TLS, so you can adapt it to Azure IoT Hub, ThingsBoard, or a private Eclipse Mosquitto broker. The AI companion includes notes on modifying endpoint and certificate handling for popular alternatives.
What programming experience is needed?
Intermediate Arduino IDE experience is enough. The code is fully commented, and the AI companion explains each block - from Modbus master register polling to JSON payload creation and TLS setup - so you learn as you build.
Modbus RTU data from five slaves aggregated by ESP32 and published to AWS IoT Core via MQTT TLS.
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