AQ Light Kit with Arduino Nano + MQ135
Arduino Uno MQ135 Air Quality Kit: Build a Colour-Coded Gas Alert Light
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Transform a handful of components into a real-time gas detection tool that glows green, amber, or red based on what it senses. This kit puts a visual twist on environmental monitoring—perfect for school science projects, home experiments, or simply seeing the invisible particles around you. The MQ-135 sensor reads gas concentrations, the Arduino Uno processes the data, and the LEDs turn data into a clear, instant alert.
What You'll Build
You'll wire the MQ-135 to an Arduino Uno, place three coloured LEDs on a breadboard, and upload a program that reads analog values. In fresh air, the green LED shines. As indoor pollutants like ammonia or benzene increase, the yellow LED takes over, and when levels cross a safety threshold, the red LED warns you. The result is a compact air quality beacon that reacts in real time—no complicated display needed.
What You'll Learn
- Connecting and calibrating the MQ-135 gas sensor
- Reading analog sensor values with Arduino Uno
- Using conditional logic (if-else) to drive colour-coded LEDs
- Understanding air quality thresholds and environmental sensing
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| MQ-135 Gas Sensor | 1 |
| 5mm Red LED | 2 |
| 5mm Yellow LED | 2 |
| 5mm Green LED | 2 |
| 220Ω Resistors | 10 |
| 10kΩ Resistors | 5 |
| 400-pt Breadboard | 1 |
| M-M Wires | 20 |
| 9V Battery Snap | 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
If you're a CBSE Class 9 or 10 student exploring sensor-based projects, an ATL tinkering lab facilitator looking for ready-made environmental kits, or a parent introducing your child to coding and air science, this kit is built for you. It aligns with CBSE practical syllabi, Inspire Award demonstrations, and informal maker learning. Even a curious 10-year-old can assemble it with the AI companion's guidance—no prior electronics experience needed.
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 open the AI companion trained on this exact project. Ask a question—it explains wiring, code, and troubleshooting. You can also message us on WhatsApp or email for human support.
Can I use this kit without prior coding experience?
Absolutely. The kit includes a fully commented example sketch. The AI companion explains every line in simple language, so you learn coding as you build. No previous experience required.
How do I calibrate the MQ-135 sensor?
After a 24-hour preheat, you set threshold values in the code based on analog readings. The AI companion walks you through taking a fresh-air baseline and choosing levels for green, yellow, and red LEDs.
What gases does the MQ-135 detect?
The MQ-135 is sensitive to ammonia, benzene, smoke, CO₂, and other volatile compounds. It's ideal for indoor air quality experiments and understanding pollution sources around you.
MQ-135 air quality sensor lights a green, amber or red LED based on gas concentration. Simple and visual.
What's in this kit
- Arduino Uno R3
- MQ-135 Gas Sensor
- 5mm Red LED x2
- 5mm Yellow LED x2
- 5mm Green LED x2
- 220Ω Resistors x10
- 10kΩ Resistors x5
- 400-pt Breadboard
- M-M Wires x20
- 9V Battery Snap
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