Arduino Air Quality Alert Kit Kit with Arduino Nano + MQ135
Arduino Air Quality Alert Kit: Build Your Own Indoor Air Pollution Monitor with Nano & MQ135
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
When a room feels stuffy, invisible gases like CO2 and volatile organic compounds are often the culprit. This kit lets young makers build a compact device that watches indoor air quality and flashes LEDs and sounds a buzzer the moment it dips below a healthy threshold — turning environmental sensing into a hands-on STEM adventure.
What You'll Build
A tabletop air quality station powered by an Arduino Nano. The MQ135 sensor continuously samples the surrounding air; as CO2 or VOC levels rise, five LEDs light up one by one as a visual bar graph. If the reading crosses the programmed danger line, a piezo buzzer alerts everyone in the room. It plugs into any laptop or USB charger and works straight out of the box after a short calibration.
What You'll Learn
- Wiring an analog gas sensor and reading real-time voltage changes
- Converting raw sensor data into meaningful air quality thresholds using Arduino code
- Using if‑else conditions to control LED arrays and a buzzer
- Calibrating the MQ135 for indoor environments and observing how ventilation affects readings
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Nano | 1 |
| MQ135 Gas Sensor | 1 |
| LED Assorted | 5 |
| 220Ω Resistors | 5 |
| Piezo Buzzer | 1 |
| Half Breadboard | 1 |
| MiniUSB Cable | 1 |
| M-M Wires | 15 |
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
Curious 10‑to‑12‑year‑olds who want to see how sensors make everyday life smarter — and parents looking for a screen‑balanced STEM activity. ATL Tinkering Lab instructors will find it a ready‑made module on environmental monitoring, while students preparing for school science exhibitions get a real‑world application that tracks air quality right in their classroom or bedroom.
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?
Open the QR‑coded AI companion, which walks you through each connection and line of code. If you need a human, drop a WhatsApp message to the number included in the box — we respond within a few hours.
Do I need any soldering or special tools?
No soldering at all. Everything plugs into the half breadboard with male‑male jumper wires. You only need a computer with a USB port to upload the code.
Can this kit be used for a school science fair project?
Absolutely. Students can demonstrate how indoor air quality changes with ventilation, compare CO2 levels before and after opening a window, and explain the science behind electrochemical gas sensors — all with a working prototype.
Is the MQ135 sensor calibrated out of the box?
It comes pre‑heated and tested, but for best accuracy you will follow a simple 24‑hour burn‑in and then set your own threshold in the Arduino sketch, which the AI companion guides you through.
MQ135 detects CO2 and volatile gases — LED bar and buzzer alert when indoor air quality drops below threshold.
What's in this kit
- Arduino Nano
- MQ135 Gas Sensor
- LED Assorted x5
- 220Ω Resistors x5
- Piezo Buzzer
- Half Breadboard
- MiniUSB Cable
- M-M Wires x15
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