Meeting Room Ventilation Monitor Kit with Arduino Uno + Relay
Meeting Room Ventilation Monitor Kit – Banish Stuffy Air with Arduino Uno + Relay
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 assemble a smart indoor air quality monitor that reads CO₂ concentration and temperature from two DS18B20 probes, displays real-time data on an OLED, and energizes a relay to start a ventilation fan the moment the room turns anaerobic — a critical system for meeting rooms, classrooms, and co-working spaces where stagnant air saps focus and wellbeing.
What You'll Build
A wall-mountable unit that continuously tracks CO₂ in ppm and ambient temperature from two points, compares them against programmable thresholds, and automatically switches a fan to refresh the air. The OLED panel shows readings and the DS3231 RTC timestamps every ventilation event, giving you a complete indoor air quality log.
What You'll Learn
- Interface and calibrate the MH-Z19B NDIR CO₂ sensor to achieve ppm-level accuracy in enclosed spaces
- Read multiple DS18B20 digital temperature sensors on a single OneWire bus and feed the data to a decision engine
- Drive a 5 V relay module from Arduino to control mains-powered ventilation equipment safely
- Design a real-time clock–driven monitoring display using I²C OLED and implement threshold-based automation logic
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| DS18B20 Probe | 2 |
| MH-Z19B CO2 | 1 |
| 5V Relay Module | 1 |
| 0.96in OLED | 1 |
| DS3231 RTC | 1 |
| 1N4007 Diode | 5 |
| 4.7kΩ Resistors | 5 |
| 100nF Caps | 10 |
| PCB Prototype Board | 2 |
| 9V Battery Snap | 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 kit is aimed squarely at B.Tech ECE/EEE students who need a functional automation project for Smart India Hackathon or final-year major submissions. ATL mentors coaching senior engineering teams will find it a perfect challenge, as will IIT, NIT, VIT, and BITS undergraduates prototyping IoT-ready building management 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?
The AI companion walks you through wiring, code upload, and threshold setting. If you still need help, message us on WhatsApp and an engineer from our build team will respond within hours.
How do I calibrate the MH-Z19B CO2 sensor?
The sensor arrives factory-calibrated, but the companion shows you how to perform a zero-point calibration in fresh outdoor air. You can also adjust the baseline via the OLED menu to match a reference meter.
Can I log the data to an SD card or send it to the cloud?
This kit focuses on real-time relay control and local display. The OLED and RTC already timestamp readings. If you want data logging, you can easily add an SD card module (not included) — the AI can suggest the modification and code snippets.
Is the relay safe for switching a 230 V exhaust fan?
Yes, the 5 V relay module is rated for 250 V AC 10 A. Always have a licensed electrician wire the mains side and ensure the entire unit is housed in an insulated enclosure. The companion includes wiring diagrams with safety notes.
Meeting Room — DS18B20 + CO2 sensor detect anaerobic conditions and trigger relay agitator motor to aerate compost.
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