Decentralised IoT Blockchain Logger
Build a Decentralised IoT Blockchain Logger with ESP32 — Immutable Sensor Chain, WiFi Sync
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Deploy three ESP32 nodes that each hash temperature and humidity readings with the previous block’s hash, creating a tamper-proof chain stored locally on microSD cards and synchronized over WiFi. This project transforms abstract blockchain concepts into a tangible, working system — ideal for environmental monitoring, supply chain audits, or academic research in distributed systems.
What You'll Build
Three standalone sensor nodes independently record and chain data. The OLED displays live hash verification, and the system can be extended to MQTT dashboards or cloud services. Each node proves data integrity locally without relying on a central server, exactly like a lightweight, low-power blockchain.
What You'll Learn
- Implementing SHA-256 hash chaining on ESP32 microcontrollers
- Designing a distributed, fault-tolerant logging system for real-world use
- Timestamping sensor data with DS3231 RTC for precise traceability
- Managing local storage and file structures with MicroSD modules
Kit Contents
| Component | Quantity |
|---|---|
| ESP32 Dev Board | 3 |
| DHT22 Temperature & Humidity Sensor | 3 |
| DS3231 RTC Module | 3 |
| MicroSD Module | 3 |
| LM2596 Buck Converter | 3 |
| 0.96in OLED Display | 1 |
| 100nF Capacitors | 20 |
| 4.7kΩ Resistors | 10 |
| PCB Prototype Board | 3 |
| Enclosure Box | 3 |
| 5V 2A Power Supply Unit | 3 |
| 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
Engineers, researchers, and advanced students diving into IoT security and distributed consensus. Perfect for B.Tech ECE/CS final-year projects, M.Tech IoT specializations, Smart India Hackathon advanced tracks, startup prototyping, and industry R&D teams wanting a hands-on blockchain proof-of-concept.
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?
The included QR code links to an AI build companion trained on this exact project, plus you can reach us via WhatsApp for personalized troubleshooting.
Do I need prior blockchain experience?
No, the kit includes detailed wiring diagrams and step-by-step code walkthroughs that explain hash chaining fundamentals from the ground up.
Can I add more nodes to the chain?
Absolutely. The ESP32 firmware is designed to be scalable; you can extend the system to 10+ nodes using the same architecture and minimal code changes.
What software libraries are used?
We supply pre-configured Arduino code using Adafruit sensor libraries, DS3231 RTC library, and a lightweight SHA-256 implementation — everything documented and ready to flash.
Each ESP32 node hashes sensor reading + previous hash to build a verifiable chain stored locally and synced via WiFi.
What's in this kit
- ESP32 Dev Board x3
- DHT22 x3
- DS3231 RTC x3
- MicroSD Module x3
- LM2596 Buck Converter x3
- 0.96in OLED
- 100nF Caps x20
- 4.7kΩ Resistors x10
- PCB Prototype Board x3
- Enclosure Box x3
- 5V 2A PSU x3
- 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.
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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