MQ-7 Carbon Monoxide Sensor Starter Kit Kit with Arduino Uno + Sensor
DIY Carbon Monoxide Alarm Kit with Arduino Uno and MQ-7 Sensor — Safety Project for Beginners
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
Carbon monoxide is odorless and lethal — build your own detector to make safety tangible. This kit creates a real-time CO monitor that triggers a buzzer and red LEDs above 50 ppm, while an LCD shows precise readings. It's a hands-on lesson in environmental sensing and alert systems.
What You'll Build
You’ll wire a breadboard with Arduino Uno, MQ-7 sensor, I2C LCD, and alarm parts. Once coded, it continuously measures CO levels. When readings cross 50 ppm, three red LEDs flash and a buzzer screams — like a real safety alarm. The LCD displays exact ppm and status, perfect for science fairs, ATL demos, or a smart home prototype.
What You'll Learn
- How electrochemical gas sensors like MQ-7 detect CO through resistance changes
- Analog sensor reading and conversion to parts per million (ppm)
- I2C communication to drive a 16x2 LCD with minimal wiring
- Conditional logic to trigger outputs (LEDs and buzzer) based on sensor thresholds
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| MQ-7 CO Sensor | 1 |
| 16x2 LCD | 1 |
| I2C Backpack | 1 |
| Active Buzzer | 1 |
| 5mm Red LED | 3 |
| 220Ω Resistors | 5 |
| 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
This starter kit is designed for young makers and absolute beginners. CBSE Class 11–12 students exploring sensor integration, ATL Tinkering Lab participants working on safety-themed projects, and B.Tech ECE freshers will find it an easy and rewarding build. Even curious 10-year-olds under parent supervision can experience the thrill of creating their first alert system. It’s ideal for Smart India Hackathon prototype testing or a simple home safety demo.
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 every wiring step and code tweak. If you need human help, WhatsApp us — we respond within a few hours.
Can I power the kit without a laptop?
Yes, the included 9V battery snap connects to the Arduino’s DC jack to make it portable. You’ll need the laptop only for uploading the code.
Is the MQ-7 sensor accurate enough for real safety monitoring?
It reliably detects CO concentrations above 50 ppm, the threshold at which symptoms may appear. For precise safety certification, use it as a learning tool and prototype, not a commercial safety device.
Does the kit include a tutorial on reading ppm values?
Absolutely. The AI companion provides the full code with calibration notes, so you’ll understand how analog voltages translate to ppm. It’s all explained for beginners.
MQ-7 detects dangerous CO levels. Red LED and buzzer alarm fires above 50ppm threshold on LCD.
What's in this kit
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