ESP32 Brewing Monitor Kit: Modbus RTU to TCP Bridge - Home Fermentation Control
Modbus RTU to TCP Bridge for Fermentation Control
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
For home brewers who demand precise fermentation temperature control, this kit lets you build an ESP32-based monitor that reads two DS18B20 temperature probes over Modbus RTU and then serves the data via Modbus TCP on your Ethernet network. Access fermentation temperatures from any device on the same network without disturbing the brew, and integrate with SCADA or home automation tools for logging and alerts.
What You'll Build
You'll construct a custom PCB that integrates an ESP32, MAX485 RS485 transceiver, and two waterproof DS18B20 probes to read fermentation temperatures in real time. The firmware bridges the Modbus RTU protocol to Modbus TCP, so any system that speaks Modbus can poll the temperature registers. The 0.96-inch OLED display provides local readings, while the Modbus TCP server lets you log data or trigger alerts remotely.
What You'll Learn
- Implement Modbus RTU master using MAX485 and ESP32 hardware serial
- Set up a Modbus TCP server on ESP32 to serve temperature registers over Ethernet
- Solder components on prototype PCB and troubleshoot RS485 bus termination and biasing
- Calibrate multiple DS18B20 sensors and handle multi-drop RS485 bus addressing
Kit Contents
| Component | Quantity |
|---|---|
| ESP32 Dev Board | x1 |
| MAX485 RS485 | x1 |
| DS18B20 Probe | x2 |
| 0.96in OLED | x1 |
| 120? Resistors | x3 |
| 10k? Resistors | x5 |
| 100nF Caps | x5 |
| PCB Prototype Board | x2 |
| Soldering Iron | x1 |
| Solder Wire | x1 |
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 is ideal for intermediate electronics students and hobbyists in India-think B.Tech ECE/EEE students working on industrial IoT projects, participants in Smart India Hackathon solving automation challenges, or CBSE Class 12 students exploring embedded systems. Home brewers with an interest in DIY electronics will also find the complete solution invaluable.
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 build companion, which is trained on this exact project. If you need human help, send a WhatsApp message - we respond within a few hours.
How do I connect the temperature probes to the brewing fermenter?
The DS18B20 probes come with waterproof stainless steel casings and 1-meter cables, suitable for direct insertion into fermentation vessels or thermowell pockets. The kit includes mounting instructions.
Can I monitor temperatures from my phone without a PC?
Once built, the Modbus TCP server runs on your local network. Use any Modbus TCP client app on your phone to read temperatures, or integrate with home automation platforms like Node-RED.
Does this kit work with fermentation control software like BrewPi?
Yes, the Modbus TCP server can feed data into BrewPi or similar open-source brewing controllers that support Modbus. Check our AI companion for integration examples.
Brewing - ESP32 reads Modbus RTU sensors via MAX485 and bridges all registers to Modbus TCP over Ethernet.
What's in this kit
- ESP32 Dev Board
- MAX485 RS485
- DS18B20 Probe x2
- 0.96in OLED
- 120? Resistors x3
- 10k? Resistors x5
- 100nF Caps x5
- PCB Prototype Board x2
- Soldering Iron
- Solder Wire
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