ESP32 Sub-Letting Energy Monitor Kit: Track Tenant Electricity Usage
Build a 3-Channel Electricity Usage Monitor for Sub-Letting with ESP32 and Web Dashboard
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 shared apartments, hostels, and PG accommodations, electricity bills often cause friction when split equally. Build a per-tenant metering system with three PZEM-004T sensors and an ESP32 that logs consumption, calculates charges, and serves a real-time web dashboard - all housed in a DIN rail enclosure.
What You'll Build
A three-channel energy monitor that tracks voltage, current, power, and cumulative energy for up to three sub-units. The ESP32 serves a responsive web interface showing live usage, daily logs, and monthly cost summaries per tenant, with data backed up to a microSD card via a DS3231 real-time clock.
What You'll Learn
- Interfacing PZEM-004T AC energy sensors over Modbus RTU
- Programming an ESP32 web server with dashboard and historical data
- Implementing real-time cost calculation and data logging with RTC and microSD
- Designing a compact, DIN rail-mountable IoT monitoring system
Kit Contents
| Component | Quantity |
|---|---|
| ESP32 Dev Board | x1 |
| PZEM-004T | x3 |
| DS3231 RTC | x1 |
| MicroSD Module | x1 |
| LM2596 Buck Converter | x3 |
| 0.96in OLED | x1 |
| 100nF Capacitors | x15 |
| PCB Prototype Board | x3 |
| DIN Rail Enclosure | x1 |
| 12V 3A Power Supply Unit | x1 |
| 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
Ideal for B.Tech EEE/ECE students working on IoT energy auditing projects, final-year engineering projects, Smart India Hackathon prototypes, and PG/hostel owners in cities like Bengaluru, Hyderabad, and Pune who want to implement fair electricity billing. Also suitable for embedded systems enthusiasts building real-world monitoring solutions.
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?
Our AI companion provides step-by-step guidance with wiring diagrams and code snippets; you can also reach our WhatsApp support for real-time help.
Can I monitor more than three sub-units?
The kit uses three PZEM-004T sensors; you can extend to more by adding sensors and modifying the firmware, but ensure your power supply and enclosure can handle the extra modules.
Is this kit safe for AC mains wiring?
The PZEM-004T modules use non-invasive current transformers and are isolated; however, all AC wiring must be done by a qualified person following electrical safety norms.
Does the web dashboard work without internet?
Yes, the ESP32 creates its own Wi-Fi access point, so the dashboard is accessible locally without internet. You can also connect it to your home Wi-Fi for wider access.
PZEM-004T per sub-unit tracks electricity usage. ESP32 web dashboard shows monthly cost per tenant.
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.
Other projects you can build
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