Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Model Compatibility | MQ-2, MQ-3, MQ-4, MQ-5, MQ-6, MQ-7, MQ-8, MQ-9, MQ-131, MQ-135, MQ-136, MQ-137, MQ-138, MQ-139 |
| Operating Voltage | 5V DC |
| Output Signal | Digital Switch Output (0 and 1) & Analog Output |
| Detection Range | LPG, Propane, Hydrogen, Methane, Alcohol, Smoke, Carbon Monoxide |
| Interface Type | 3-Pin Header (VCC, GND, DO/AO) |
| Potentiometer | Adjustable Sensitivity Control |
| Indicator LED | Power LED and Digital Switch Output LED |
| PCB Dimensions | 32mm x 20mm x 10mm |
| Application | Arduino, Raspberry Pi, DIY Electronics, Home Safety Projects |
| Package Includes | 1x MQ Sensor Module |
Anonymous
Mar 31, 2026
Rating: 5/5
Excellent build quality
The soldering on the board is clean, and the pins are sturdy. I used this for a smoke detection prototype, and it responded quickly to test smoke. Highly recommended for hobbyists.
Anonymous
Mar 29, 2026
Rating: 5/5
Reliable and sensitive
I tested this against alcohol vapor and it triggered the digital output immediately after calibration. The compact size fits perfectly into my custom enclosure.
Anonymous
Mar 25, 2026
Rating: 4/5
Works as described
Easy to connect and use. The documentation online is plentiful which helped me get started quickly. Only giving 4 stars because the header pins were slightly bent upon arrival, but easy to fix.
Anonymous
Mar 16, 2026
Rating: 5/5
Great for learning electronics
Bought this for a university project on IoT home safety. The analog output allows for detailed data logging, and the digital output is great for simple alarms. Very versatile.
Anonymous
Mar 15, 2026
Rating: 5/5
Perfect for my Arduino project
This module worked flawlessly with my Arduino Uno. The sensitivity adjustment pot makes it very easy to calibrate for different environments. Great value for the price.
Anonymous
Mar 09, 2026
Rating: 4/5
Good sensor, needs warm-up time
The sensor works well once it has warmed up for a minute or two. Just remember that these gas sensors need a brief heating period before giving stable readings. Otherwise, very satisfied.
Q: Can this detect carbon monoxide specifically?
A: Yes, specific models in this series like the MQ-7 and MQ-9 are designed primarily for Carbon Monoxide detection. Please select the specific sensor type labeled on the component when ordering for best results.
Q: Does this module work with 3.3V logic boards like the ESP8266?
A: Yes, the digital output is generally compatible, but since the module operates at 5V, you may need a voltage divider or level shifter for the signal pin if your board is strictly 3.3V tolerant. The VCC should remain at 5V for the heater to function correctly.
Q: How long does the sensor need to warm up before use?
A: Typically, these MQ sensors require a warm-up period of about 24 to 48 hours for initial stabilization when new. For regular daily use, a 1-2 minute warm-up is usually sufficient to get stable readings.
Q: Is the library available for Python on Raspberry Pi?
A: While there isn't one single official library, many community-created Python scripts and libraries (like RPi.GPIO) are available on GitHub to read the analog and digital signals from this module using an ADC chip if your Pi lacks analog inputs.
Q: What is the difference between the DO and AO pins?
A: DO (Digital Output) provides a HIGH or LOW signal based on whether the gas concentration exceeds the threshold set by the potentiometer. AO (Analog Output) provides a continuous voltage value proportional to the gas concentration, allowing for precise measurement.
Chunfei Grocery Store Yunan GR02 Gravel Bike, Thru-Axle, Mechanical Disc Brakes, Lightweight Touring Setup with Multiple Rack Mounts
$6,441.00
Electric Guitar Tutorial for Beginners - 7-Week Self-Study Plan with Exercises, Corrections, and Materials
$219.00
Professional Bathtub-Style Brush Washing Set - Cute 3-Piece Watercolor and Chinese Painting Brush Cleaner with Palette
$11.80
![[Sold Out & Discontinued - Display Only] Radish Defense ABO20.0 Spring Tour Series Blind Box Figure](https://www.gosteppe.com/cache/small/product/269201/legacy-main-5af4651a8d30dc42d9412600.png)
[Sold Out & Discontinued - Display Only] Radish Defense ABO20.0 Spring Tour Series Blind Box Figure
$16.90
Ebru Marbling Plastic Tool Kit – Needles, 3-Prong Combs, Cones, Straws, and Droppers for Peacock Patterns
$1.28
CANDLE.LAB | Silicone Border Mat for DIY Scented Candles and Soap Making Tray Mold
$32.00
Shiji Runde Coal Shed Mine Dust Removal Explosion-Proof Anti-Freezing Fog Cannon Port Dust Suppression 80m Ultra-Fine Industrial Fog Machine
$4,180.00
Mobile Retractable Spray Booth for Furniture - Foldable Track-Mounted Painting Room
$6,240.00
Long Handle Bristle Paint Brush - Hog Hair Brush for Oil Painting, Acrylic Wall Art, and Children's Drawing
$1.80
Electrostatic Powder Coating Equipment and Electronic Powder Dispenser Supply
$17,250.00
DIY Toast-Shaped Silicone Mold for Handmade Soap - Square Soap Making Mold
$105.00
Kindergarten Sponge Stamp Set – Mushroom-Head Circular Printing Tools for Kids' DIY Art and Painting Kits
$3.50
Heavy-Duty Lifting Chain Set – Manganese Steel Chains with Hooks, Rings, and Hoist Accessories
$198.00
Car Tire Stone Removal Tool, Multi-Function Groove Hook for Portable Tire Picking and Cleaning
$11.50
m Dogs Strap Auto Retractable Dual Dog Leash With
$199.92
Traditional Wooden Sheepskin Rattle Toy – Safe for Teething Newborns, Handcrafted Baby Bell Shaker
$17.80
Soilless Cultivation Equipment Plant Factory Display Rooftop Hydroponic Pipe System for Leafy Vegetables and Fruits, Type A Planting Rack
$2,620.16
Premium Ceramic Tea Canister and Gift Box Set - Empty Packaging for Black Tea, Pu'er, White Tea, and Biluochun
$121.00
Posture-Correcting Hole-Grip Pencils for Grade 1 - Triangular Barrel, Break-Resistant, Non-Toxic HB for Daily Writing and 2B for Exams
$3.02
Genuine OEM AC Blower Motor Heater Fan for Buick Excelle GT, Cavalier, and Monza
$255.00
TA1 TA2 Titanium Capillary Tubes - Small Diameter Titanium Pipes - GR5 Titanium Alloy Tubes
$240.00
Industrial Spray Painting Wipe Cloth Auto Bake Finish Film Application Degreasing Cloth Non-Woven Absorbent Paper Lint-Free Paper Electrostatic Dust Removal Paper
$75.66
US Standard Buttress Thread Inserts 22ER 16ER 11NR 16 10 12 8ABUT Internal 7 External 45 Degree
$43.20
Coating Workshop Cleaning Rags GAE Industry White Scrap Cloth Nylon Machine Cloth Blocks Industrial Glue Removal Furniture Cleaning
$96.31
Natural 8A Yellow Tiger Eye Loose Beads - Round Cat's Eye Bracelet for DIY Jewelry Making
$17.28
Paper Blending Stumps Art Set for Highlighting, Sketching, and Smudging - Professional Drawing Tools for Artists and Beginners with Rice Paper Details and Oil Pastels
$6.80
Rubber Speed Bump 1000x350x40mm Herringbone Pattern
$96.89
![Xian Kan Yun Shu [Cloud Lark] Elegant Brush Washer, Hand-Painted Orchid and Sparrow Design under Glaze, Ceramic Water Pot](https://www.gosteppe.com/cache/small/product/269176/legacy-main-b83d0e5d0aba33de561a2b48.webp)
Xian Kan Yun Shu [Cloud Lark] Elegant Brush Washer, Hand-Painted Orchid and Sparrow Design under Glaze, Ceramic Water Pot
$21.20
Cable Organizer Hook-and-Loop Straps for Data/Charging Cables, Laptop Power, Mouse, Headphones, and Under-Desk Network Wiring
$7.48
Power Strip Organizer Box, Desktop Socket Concealment Case for Charging Cables and Power Cords, Hidden Storage Shelf
$21.93
![[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)
