Industrial Energy Meter with Tamper-Evident Log
Industrial Energy Meter with Tamper-Evident Logging – Arduino Portenta C33 Platform
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
You will build a tamper-proof energy monitoring system that records power consumption data, signs every entry with a cryptographic HMAC key generated by the Portenta C33’s secure element, and stores an unalterable log on an SD card while simultaneously uploading to the cloud. This kit transforms raw energy readings into legally defensible audit trails for industrial energy audits, sub-metering, or compliance reporting. Every component from the PZEM-004T sensor to the DIN Rail enclosure is included, so you can focus on the secure logging architecture without sourcing parts separately.
What You'll Build
A complete DIN-rail mountable industrial energy meter that captures voltage, current, power, and energy parameters from any single-phase load or feeder. The device timestamps and cryptographically signs every data record, preventing post-collection tampering, and provides both local display on an OLED and remote cloud visibility. The tamper-evident chain ensures that any alteration attempt is detectable, making it ideal for billing reconciliation or energy theft detection in Indian factory floors and commercial buildings.
What You'll Learn
- Configuring and reading PZEM-004T energy data over Modbus-RTU.
- Generating and managing HMAC signatures using the Arduino Portenta C33’s on-chip crypto engine.
- Implementing a tamper-evident log chain with sequence-linking and write-only storage on SD card.
- Integrating real-time timestamps via DS3231 RTC and setting up cloud data upload.
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Portenta C33 | 1 |
| Portenta Mid Carrier | 1 |
| PZEM-004T Energy Meter | 1 |
| DS3231 RTC | 1 |
| MicroSD Module | 1 |
| LM2596 Buck Converter | 1 |
| 0.96in OLED | 1 |
| 1000µF 25V Caps | 3 |
| 100nF Caps | 10 |
| PCB Prototype Board | 2 |
| 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
This kit is designed for professional engineers, energy auditors, and final-year B.Tech (EEE/ECE) students working on advanced industrial IoT projects. It suits participants of the Smart India Hackathon’s energy challenges, researchers at IITs or NITs validating billing integrity, and entrepreneurs building commercial sub-metering solutions for Indian industries. It presumes prior experience with C/C++ and basic electronics assembly.
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 launch the AI companion trained on this exact project; it understands every connection and log verification step. If you need human help, our WhatsApp support replies within hours.
Can the HMAC key be changed or managed?
Yes, you can provision your own symmetric key through the Portenta C33’s secure element using Arduino IDE. The AI companion will guide you through key rotation and storage best practices.
How do I verify the tamper-evident log?
Each record carries a sequence number, ISO 8601 timestamp, and HMAC computed over the payload. The AI companion provides a verification script that replays the chain and alerts you to any missing or altered entries.
Is this suitable for three-phase metering?
This kit targets single-phase circuits. For three-phase, you can add two more PZEM-004T sensors with isolation modifications; the AI companion can outline the changes and wiring for such an extension.
PZEM-004T energy readings HMAC-signed by C33 crypto engine. Tamper-evident chain stored on SD and uploaded to cloud.
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