Secure Meeting Room CO2 Monitor with Arduino Portenta C33 & TrustZone Kit
Build a Secure Meeting Room Ventilation Monitor with Arduino Portenta C33 and TrustZone
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Meeting rooms in offices, colleges, and co-working spaces often suffer from stale air and climbing CO? levels, directly impacting focus and decision-making. This kit turns the Portenta C33 into a wall-mounted monitoring unit that tracks CO?, temperature, humidity, and barometric pressure-while locking Wi-Fi credentials and MQTT TLS certificates inside hardware-isolated TrustZone storage, out of reach of any application firmware bug. You'll build a fully encrypted sensor node that streams live data to a cloud dashboard, giving facility managers or research teams a security-certified view of air quality.
What You'll Build
A self-contained ventilation monitor with an OLED display that shows real-time CO? (ppm), temperature, humidity, and pressure. The monitor connects via Wi-Fi to an MQTT broker over TLS 1.2, encrypting every payload. All sensitive keys and certificates live in the Portenta C33's secure world, separated from the application code that reads sensors and drives the display. The finished unit mounts inside the included waterproof enclosure, ready for deployment in a real meeting room.
What You'll Learn
- Partitioning firmware with ARM TrustZone on the Cortex-M33 to isolate secrets from application logic
- Configuring mutual TLS MQTT sessions using pre-generated certificates and broker endpoints
- Fusing data from a NDIR CO? sensor (MH-Z19B), barometric pressure sensor (BMP280), and temperature/humidity sensor (DHT22)
- Designing a stable 5?V power rail with the LM2596 buck converter and populating a perforated prototype board for permanent installation
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Portenta C33 | 1 |
| Portenta Mid Carrier | 1 |
| DHT22 | 1 |
| BMP280 | 1 |
| MH-Z19B CO2 | 1 |
| LM2596 Buck Converter | 1 |
| 0.96in OLED | 1 |
| 4.7k? Resistors | 5 |
| 100nF Caps | 10 |
| PCB Prototype Board | 2 |
| Waterproof Enclosure | 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 kit is designed for final-year B.Tech students in ECE, EEE, or CS who need a production-grade secure IoT project. Participants in Smart India Hackathon's hardware track will find a ready-to-adapt air quality solution. Early-career embedded engineers at companies prototyping smart office infrastructure, and research scholars at IITs, NITs, or VIT exploring TrustZone-based security, will also benefit from the end-to-end design.
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 to start a chat with the AI build companion; it knows every step of the TrustZone provisioning and MQTT TLS setup. For additional questions, WhatsApp support is available 7 days a week.
Can I use this kit with AWS IoT Core or another cloud broker?
Yes. The MQTT client and TLS configuration are replaceable; you can point to any broker endpoint and load your own certificates following the AI companion's guide.
Does the kit work without Wi-Fi?
The monitor displays all sensor readings locally on the OLED at all times. Cloud upload and remote dashboard access require a Wi-Fi network.
How do I view the data remotely?
The companion sets up a cloud dashboard via the included broker. You can later modify the firmware to send data to any platform that accepts MQTT, such as AWS, Azure, or a custom Node-RED server.
Meeting Room - C33 TrustZone isolates sensor credentials and keys from application firmware. MQTT over TLS to cloud broker.
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