Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Sensor Type | MQ-2 Semiconductor Gas Sensor |
| Detectable Gases | LPG, Propane, Hydrogen, Methane, Alcohol, Smoke, CO |
| Operating Voltage | 5V DC |
| Output Signal | Digital Switch Output (0 and 1) & Analog Voltage Output |
| Sensitivity Adjustment | Adjustable via onboard potentiometer |
| Response Time | < 10 seconds |
| Recovery Time | < 30 seconds |
| Interface | 3-Pin Connector (VCC, GND, DO/AO) |
| PCB Dimensions | 32mm x 20mm x 14mm |
| Compatibility | Arduino, Raspberry Pi, ESP32, STM32 |
Anonymous
Mar 29, 2026
Rating: 5/5
Perfect for home safety projects
I used this module to build a kitchen gas leak detector. The sensitivity adjustment works great, and it detects alcohol vapors instantly during testing. Very easy to interface with my Arduino Uno.
Anonymous
Mar 22, 2026
Rating: 4/5
Good value but needs calibration
The sensor works as advertised. You do need to let it warm up for about 24 hours initially for stable readings. Once calibrated, the digital output triggers reliably when smoke is present.
Anonymous
Mar 20, 2026
Rating: 4/5
Solid module for the price
Does exactly what the description says. The LED indicator on the board is helpful for visual debugging. My only minor complaint is that the pin headers were not included, but soldering them on was easy.
Anonymous
Mar 14, 2026
Rating: 4/5
Works well with ESP8266
Integrated this into my IoT setup. It sends alerts to my phone when gas levels rise. Just remember the operating voltage is 5V, so use a level shifter if connecting directly to 3.3V logic pins.
Anonymous
Mar 11, 2026
Rating: 5/5
Reliable and robust
Bought five of these for a university project on air quality monitoring. All units performed consistently. The analog output allows for granular data logging which was essential for our graphs.
Anonymous
Mar 09, 2026
Rating: 5/5
Excellent sensitivity
I was surprised by how quickly it reacted to lighter fluid fumes during a test. The potentiometer gives you full control over the threshold. Great component for learning about gas sensing.
Q: Does this module come with a library for Arduino?
A: This is a hardware sensor module and does not include software. However, there are many open-source libraries available in the Arduino Library Manager (search for 'MQ2') that make reading the data very simple.
Q: Can it distinguish between different types of gas?
A: The MQ-2 is a general combustible gas sensor. It can detect the presence of various gases like LPG, hydrogen, and smoke, but it cannot specifically identify or distinguish which specific gas is causing the trigger without complex additional processing.
Q: What is the warm-up time required before accurate readings?
A: For best results, the sensor should be powered on for at least 24 hours initially to stabilize the internal heating element. After the initial burn-in, it typically requires 1-2 minutes of warm-up upon each power cycle.
Q: Is the output compatible with 3.3V microcontrollers like ESP32?
A: The module operates at 5V. While the digital output often reads high enough for 3.3V logic, it is safest to use a voltage divider or a logic level converter for the analog and digital outputs to protect your 3.3V board.
Q: Can this sensor detect natural gas leaks in a home?
A: Yes, the MQ-2 sensor is sensitive to methane and other combustible gases found in natural gas. However, for critical life-safety applications, we recommend using certified industrial-grade detectors alongside DIY projects.
Bucket Pack Natural Wood Colored Pencils Water-Soluble for Kids Coloring and Doodling
$6.65
Chunfei Grocery Store Yunm'an GR02 Gravel Bike - Thru-Axle Disc Brake, Lightweight Touring with Multiple Rack Mounts
$6,444.00
Variable Frequency Drive Power Board ZPOW-591 for ACS880
$2,200.00
Professional Sketching Eraser Kit - Blending Stumps, Sponges, and Paper Tortillons for Highlight & Shadow Correction
$3.90
Weighted Water Bag with Handle, Thickened PV Mesh Gravity Ballast for Banner Stand Fixation (8KG)
$35.10
Ultra-Fine Purification Lint-Free Cloth Cleaning Cloth Lens Wipe High Quality 0730 Water-Absorbing Dust Removal UV Nozzle 100 Sheets
$96.00
Wen Zhengming Small Regular Script Calligraphy Cards: Li Sao Jing, Thousand Character Classic, Qin Fu, Cao Tang Shi Zhi, Qing Jing Jing, Record of the Drunken Pavilion, Red Cliff Ode
$59.00
Zhizhi Manshu Zhao Mengfu Small Regular Script Collection of Ancient Classics (Vol. 1) - Calligraphy Copybook, Brush Writing Cards, Foldable Practice Cards
$49.00
Language of Drums Motion Path Set - Essential Creativity and Rhythm Teaching Material for Drum Kits and Jazz Drums
$59.14
onlycook Sink Drain Basket, Faucet-Mounted Food Residue Separator and Washing Strainer - 1 Pack
$14.10
Heavy-Duty Wiper Arms and Blades for Trucks and Agricultural Vehicles - Universal Replacement Wiper Rubber Strips
$5.50
Bus Adapter FEPL-02 for ABB Variable Frequency Drive
$1,230.00
Baby National Trend Rattle Toy – Chewable Silicone, Easy-Grip Handle, Soft Sound for Early Learning
$19.90
Palace Museum Creative Stationery: Light & Shadow Graffiti Coloring Book - Exquisite DIY Children's Gift, Ancient Style Watercolor Set for Boys and Girls, Early Learning Art Toy
$29.70
Dongyi Study Room Antique Brass Water Pot, Brush Washer Basin, and Small Spoon Set for Calligraphy (3-Piece)
$33.10
![[Deposit Only] Slightly Round Mid-Heel Shoes – Matte Lambskin Puff Lolita Bow Pumps](https://www.gosteppe.com/cache/small/product/269338/legacy-main-1108a4ac9d29ca837505d228.webp)
[Deposit Only] Slightly Round Mid-Heel Shoes – Matte Lambskin Puff Lolita Bow Pumps
$38.00
Chunfei Grocery Store Yunan GR02 Gravel Bike with Thru-Axle Disc Brakes, Lightweight Touring Setup with Multiple Rack Mounts
$8,934.00
5A Natural Madagascar Rose Quartz Loose Beads, Pink Crystal Rhodonite Single Beads for DIY Jewelry Making Accessories
$0.70
Mini Portable Sketchbook - Blank Pocket Notebook for Doodling, Sketching, Watercolor, Acrylic, and Marker Art - Square Hand-Drawn Journal
$5.53
Kitchen Sink Drain Mat with Raised Slope - Splash-Proof Countertop Organizer for Faucet Areas
$9.00
Front Wheel Bearing for Hyundai Mistra - Mingtuo Brand - Also Fits Hyundai Sonata and Kia Opirus - Front and Rear Auto Bearings
$275.00
White Crystal Loose Beads Donghai Agate Gemstone Gold Rutilated Quartz Obsidian Bracelet Strand Aquamarine Amethyst Single Bead
$8.42
Kids Art DIY Stamp Kit - Round Sponge Daubers, Mushroom Head Stamps, and Paint for Graffiti
$2.44
YP8 YP-80000 Book Block Pressing Machine Supply Robust Structure Reliable Application
$23,790.00
Feileniao Four Seasons Flowers Line Drawing Atlas - Chinese Ink Painting Guide for Brush Beginners
$39.90
365 Days! Drummer Training Plan - Beginner Self-Study Guide for Drum Kits and Jazz Drums with Tutorial Audio
$55.00
New Rechargeable Electric Incense Making Machine – Compact Home Device for Extruding Coil, Sandalwood, and Stick Incense, Manual Incense Crafting Equipment
$268.00
Tire Stone Removal Hook, Multi-Function Tool with Built-in Screwdriver for Window Breaking and Self-Defense
$7.51
Pearl Sand Wax, Ice Flower Wax, Floating Aromatherapy Candle Colored Suspended Particles for Atmosphere Decor and DIY Crafts
$5.78
No-Drill Wall-Mounted Toilet Paper Holder and Storage Shelf for Bathroom
$19.30
![[Youxin Electronics] GP2Y0E03 Infrared Distance Sensor Module 4-50cm Range](https://www.gosteppe.com/cache/medium/product/74667/legacy-main-4da8cadc5fc82afe91b124e3.webp)
![[Trial Pack] Xianlang Complete Cat Treat Sticks Meal Packs Main Course Cans Freeze-Dried Cat Food Sample Snacks Gift Set](https://www.gosteppe.com/cache/medium/product/208273/legacy-main-9ec245ebf781f65a434ba854.webp)
