ESP32 Modbus TCP Industrial Gateway Kit: Bridge Modbus RTU Sensors to TCP over Wi-Fi

Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.

In modern factories, legacy Modbus RTU sensors still dominate, while SCADA and cloud systems demand Modbus TCP. This kit lets you build a real, working gateway that reads temperature data from two industrial-grade DS18B20 sensors over an RS485 bus, then serves those readings as standard Modbus TCP registers on your local Wi‑Fi network. It’s a hands‑on lesson in Industry 4.0 bridging, perfect for engineering students and hobbyists exploring industrial automation.

What You'll Build

A fully functional Modbus gateway on an ESP32 that continuously polls two DS18B20 probes via MAX485 and Modbus RTU, converts the temperature values into Modbus TCP holding registers, and displays them on a bright OLED screen. Connect any Modbus master—like a SCADA system, Node-RED dashboard, or Python script—to your gateway over Wi‑Fi and read real‑time temperature data from anywhere on the network.

What You'll Learn

• Implement Modbus RTU master protocol on ESP32 to poll sensor registers over RS485.
• Configure ESP32 as a Modbus TCP server that exposes register data over Wi‑Fi.
• Interface the MAX485 transceiver for reliable half‑duplex RS485 communication.
• Write firmware to parse DS18B20 temperature values and map them to Modbus registers on a live OLED display.

Kit Contents

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.