Nano Air Quality Egg Kit with Arduino Nano + Sensor
Build a Color-Coded Air Quality Egg with Arduino Nano, MQ-135, and DHT22
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Hold a living indicator of the air you breathe—a palm-sized egg that pulses green when the room is fresh, yellow when danger nears, and red when it’s time to open a window. This kit turns an Arduino Nano, MQ-135 gas sensor, and DHT22 into a desktop companion that makes invisible pollutants visible. Whether you’re curious about indoor CO₂ spikes during a family gathering or want a science fair project that actually lives on your desk, the Air Quality Egg gives data a physical presence.
What You'll Build
You’ll assemble and code a standalone air quality station inside a 3D printed egg enclosure. The MQ-135 sniffs out ammonia, benzene, smoke, and other volatile compounds, while the DHT22 tracks temperature and humidity. An RGB LED lights up green (good), yellow (caution), or red (poor) based on sensor thresholds you set. The whole unit runs from a 9V battery, so you can move it from kitchen to bedroom, collecting evidence about the air you actually live in.
What You'll Learn
- Wire an MQ-135 gas sensor to analog input and interpret its resistance changes as air quality levels
- Read digital temperature and humidity from a DHT22 using a one‑wire library
- Program an RGB LED to display three distinct colour zones with smooth transitions
- Calibrate gas sensor baselines and set detection thresholds for real‑world environments
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Nano | 1 |
| MQ-135 Gas Sensor | 1 |
| DHT22 | 1 |
| RGB LED Common Cathode | 1 |
| 220Ω Resistors | 5 |
| 10kΩ Resistors | 5 |
| PCB Prototype Board | 2 |
| 3D Printed Egg Enclosure | 1 |
| 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
ATL Tinkering Lab students from classes 5 to 10 will find the soldering and coding right at their edge—challenging enough to build confidence, clear enough to finish in a single afternoon. CBSE Class 11–12 physics and computer science students can use it to demo sensor integration and data logging for board practicals. Even B.Tech first‑year ECE/EEE learners get a quick win that cements analog sensor fundamentals before moving on to more complex IoT stacks.
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 on the box to chat instantly with the AI companion, or text us on WhatsApp. We’ll walk you through wiring, code uploads, or calibration until your egg glows correctly.
My enclosure doesn’t fit the sensors. What should I do?
The 3D printed egg is designed for a snug press‑fit of each module. If it seems tight, warm the plastic gently with a hair dryer for 10 seconds and press the sensor in while it’s slightly pliable. Still stuck? Reach out and we’ll guide you.
Can I add a display to show numerical values?
Yes—the Nano’s spare digital pins can drive an OLED or LCD. The AI companion includes add‑on wiring diagrams and code snippets for that upgrade when you’re ready.
Is the MQ‑135 sensitive enough for indoor air quality?
After a 24‑hour burn‑in, it detects changes from cooking, vehicle exhaust near windows, and paint fumes. It won’t rival a scientific monitor, but it reliably shows relative shifts from fresh to polluted air.
MQ-135 and DHT22 on Nano in 3D printed egg enclosure. RGB LED colour codes air quality.
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