Home Brewing Temperature Monitor Kit with ESP32 + Relay
Build a Tariff-Optimized Brewing Temperature Controller with ESP32
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Home brewing demands precise temperature control, but running a heater on a flat electricity tariff can inflate costs. This kit puts an ESP32 at the heart of a system that reads water temperature with dual DS18B20 probes, tracks current with an ACS712 sensor, and uses a real-time clock to identify and activate your heater only during off-peak tariff windows. The result: consistent mash temperatures without the bill shock.
What You'll Build
Assemble a self-contained temperature monitor and relay controller housed in an enclosure. Two waterproof DS18B20 sensors provide redundancy or dual‑zone monitoring, while the ACS712 sensor logs actual heater power usage. An OLED displays live temperatures, current, and the next scheduled heating window. Data logs store to microSD for tariff pattern analysis, and the 5V relay module switches a mains‑rated heater on only when electricity is cheapest.
What You'll Learn
- Interfacing DS18B20 waterproof sensors with ESP32 over OneWire and parsing temperature data reliably
- Measuring AC current with an ACS712 20A module and calculating real‑time power consumption
- Scheduling events using a DS3231 RTC and logging sensor data to microSD for later analysis
- Designing a relay control algorithm that determines the cheapest tariff slots and actuates a heater accordingly
Kit Contents
| Component | Quantity |
|---|---|
| ESP32 Dev Board | 1 |
| DS18B20 Waterproof | 2 |
| ACS712 20A | 1 |
| DS3231 RTC | 1 |
| MicroSD Module | 1 |
| 5V Relay Module | 1 |
| 0.96in OLED | 1 |
| LM2596 Buck Converter | 1 |
| 100nF Caps | 10 |
| 4.7kΩ Resistors | 5 |
| 10kΩ Resistors | 5 |
| PCB Prototype Board | 2 |
| Enclosure Box | 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
Home brewing enthusiasts who want to cut energy bills without compromising on temperature precision will find this project a perfect match. B.Tech ECE/EEE students working on smart grid or energy management projects, Smart India Hackathon participants tackling sustainable appliances, and makers from ATL Tinkering Labs or IIT/NIT/VIT/BITS seeking an advanced IoT build that goes beyond basic temperature sensing will value the real‑world tariff optimization challenge.
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 start a conversation with the AI companion trained on every step of this project. For tricky hardware issues, our WhatsApp support team typically responds within a few hours.
Can I upload my own electricity tariff schedule?
Yes, the microSD card stores a CSV file where you define time slots and rates. The AI tutorial walks you through formatting, and the firmware reads the cheapest slots automatically.
What type of heater can this control?
The 5V relay module safely switches resistive loads up to 250V AC at 10A. The ACS712 20A sensor allows monitoring up to 4.4 kW, so it works with most home brewing immersion heaters.
Does the kit include all soldering tools?
The kit includes a basic soldering iron and solder wire. You will also need wire cutters, a multimeter, and a USB‑C cable for the ESP32, which are not part of the kit.
Brewing — DS18B20 water temp + ACS712 current + RTC schedule learns cheapest tariff window and controls heater relay optimally.
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.
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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