ESP32 AES-128 Encrypted Sensor Node Kit with ESP32 + DHT22
ESP32 AES-128 Encrypted Sensor Node Kit – Build a Secure IoT Data Pipeline
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Imagine a temperature, humidity and pressure sensor node that doesn't just send raw readings over MQTT, but encrypts every byte with AES‑128 so that even if the network is sniffed, the payload is meaningless without the pre‑shared key. This kit turns that vision into a working system: the ESP32 collects DHT22 and BMP280 measurements, timestamps them via the DS3231 RTC, encrypts, publishes, and a Python gateway decrypts and stores the stream in InfluxDB—ready for Grafana dashboards.
What You'll Build
You’ll assemble and program a standalone sensor node that reads environmental data, applies 128‑bit AES encryption in ECB mode, and pushes cipher text to an MQTT topic. A companion gateway script receives the message, decrypts using the same key/IV, and inserts the plain‑text metrics into InfluxDB with millisecond‑accurate timestamps. The OLED shows live connection status and the last encrypted payload length, while the microSD logs raw encrypted frames for forensic analysis.
What You'll Learn
- Implementing AES‑128 encryption on ESP32 using the mbedtls library without external dependencies.
- Matching encryption parameters (key derivation, IV, padding) across C++ on ESP32 and Python on the gateway to avoid silent decryption failures.
- Integrating DHT22, BMP280, DS3231 RTC, and microSD in a single power‑managed circuit, handling I²C conflicts and timing.
- Building a complete secure MQTT pipeline—from edge encryption to time‑series storage—and diagnosing data integrity with Wireshark.
Kit Contents
| Component | Quantity |
|---|---|
| ESP32 Dev Board | 1 |
| DHT22 | 1 |
| BMP280 | 1 |
| DS3231 RTC | 1 |
| MicroSD Module | 1 |
| LM2596 Buck Converter | 1 |
| 0.96in OLED | 1 |
| 4.7kΩ Resistors | 5 |
| 100nF Caps | 10 |
| PCB Prototype Board | 2 |
| Enclosure Box | 1 |
| 5V 2A 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 advanced IoT security kit is built for B.Tech ECE and EEE students at IITs, NITs, VIT, and BITS Pilani who are tackling Smart India Hackathon challenges or final‑year projects involving encrypted telemetry. It’s equally suited for hobbyists who have a working MQTT setup and want to move beyond plain‑text payloads to a production‑grade encryption layer on resource‑constrained devices.
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 AI companion gives you granular, step‑by‑step troubleshooting for this exact project, and if you need human intervention, our WhatsApp support team typically replies within an hour during Indian working hours.
Will this kit work with my existing MQTT broker on a Raspberry Pi?
Absolutely. The ESP32 firmware is designed to connect to any MQTT broker; you’ll only need to update the broker IP and credentials. The AI companion walks you through changing these settings safely without disrupting the encryption logic.
Do I need prior cryptography knowledge?
No—the C++ and Python code implement AES‑128 using well‑documented mbedtls calls. The AI companion explains key scheduling, IV usage, and why padding matters, so you’ll gain understanding as you build, even if you’ve never studied crypto before.
Can I add extra sensors like a GPS or air quality sensor?
Yes, the prototype board’s I²C bus and spare GPIOs let you expand. The AI companion will help you modify the firmware to read the new sensor, include its data in the encrypted payload, and update the gateway’s parsing routine so everything remains synchronized.
Sensor data AES-128 encrypted on ESP32 before MQTT publish. Gateway decrypts and stores in InfluxDB.
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