Arduino Mega Smoke Alarm Kit
Build a PCA-Powered Garage Smoke Alarm with Arduino Mega
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Garages are tricky spaces - a whiff of paint thinner, a splash of petrol, or morning exhaust can trigger a simple smoke alarm. This kit goes beyond threshold beeping. Using four different MQ sensors and principal component analysis (PCA) on an Arduino Mega, you'll build an alarm that learns to separate harmless fumes from true smoke and flammable gas signatures, logging data to a microSD card and displaying real-time classification on a TFT screen.
What You'll Build
A smart garage smoke alarm that doesn't just scream at every puff of sawdust. You'll assemble a multi-sensor array (MQ-2, MQ-7, MQ-135, MQ-4) wired to a Mega, collect gas profiles, run PCA to reduce dimensions and cluster patterns, then code a classifier that triggers an alert only when a fire signature dominates. The 1.8" TFT displays gas concentrations and alarm status, while the RTC-stamped data logs to microSD for post-analysis.
What You'll Learn
- Multi-dimensional gas sensing and sensor fusion across four chemically different MQ elements
- Principal Component Analysis in Arduino C++ - implemented from scratch without external libraries
- Real-time data logging with DS3231 RTC and SPI microSD, timestamped for incident forensics
- Designing false-alarm-resistant algorithms for real-world garages where LPG, CO, and solvents mix
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Mega 2560 | 1 |
| MQ-2 gas sensor | 1 |
| MQ-7 carbon monoxide sensor | 1 |
| MQ-135 air quality sensor | 1 |
| MQ-4 methane sensor | 1 |
| DS3231 RTC module | 1 |
| MicroSD module | 1 |
| 1.8in TFT ST7735 display | 1 |
| 10k? Resistors | 15 |
| 100nF Capacitors | 15 |
| 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
Built for final-year B.Tech ECE or EEE students tackling fire detection for Smart India Hackathon or capstone projects. If you're at IIT, NIT, VIT, or BITS and need a research-grade approach - PCA on a microcontroller - without chasing individual sensor specs, this kit delivers. ATL tinkering labs running advanced embedded+data science modules for 18+ students will also appreciate the guided, hands-on experience.
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 provides step-by-step troubleshooting, and you can reach our team on WhatsApp for human assistance within hours.
Do I need prior PCA or matrix math knowledge?
Not necessarily. The companion explains the linear algebra behind each step, and the Arduino code is heavily commented so you can follow the computation line by line.
Can I log more than gas data with this setup?
Yes, the microSD module logs any sensor variable you add. The DS3231 timestamps all entries, perfect for expanding into a complete garage environment monitor.
Is this kit suitable for a garage with an LPG-powered car?
Absolutely. MQ-4 detects methane (CNG/LPG), while MQ-2 responds to LPG and smoke. PCA helps separate a cooking gas leak from a genuine fire, reducing false alarms.
Garage Fire - MQ-2, MQ-7, MQ-135, MQ-4 read simultaneously. Principal component analysis on Mega separates gas signatures.
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