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.
Southern Red Agate Loose Beads for DIY Crystal Jewelry Making, Round Bead Accessories and Materials
$1.10
3-Tier, 4-Tier, 5-Tier Double-Layer Drainage Rack, Water Bucket Stand, Floor-Standing Thickened Rack
$276.32
Multi-Layer Over-Toilet Storage Rack for Bathroom, Drill-Free Floor Stand for Washing Machine and Balcony Organization
$46.96
Thickened Industrial Scouring Pad Emery Stainless Steel Abrasive Cloth Pot Scrubber Rust Removal and Polishing Wheel
$7.28
Wall-Mounted Bathroom Toilet Paper Holder and Tissue Dispenser Rack
$49.00
Arches French Watercolor Paper 300g/640g/850g, Cold/Hot Press, 100% Cotton, Deckled Edge, 2K/4K/8K
$29.60
Wen Xin Tang Yan Zhenqing Duobao Pagoda Stele Calligraphy Copybook, Tang Regular Script, Adult Beginner Calligraphy Practice Cards
$49.30
![[Shenzhen Best Seller] Premium Wearable Negative Ion Air Purifier - Neck-Hanging Portable Electronic Mask](https://www.gosteppe.com/cache/small/product/268987/legacy-main-5f71c8070119587e6427efe9.webp)
[Shenzhen Best Seller] Premium Wearable Negative Ion Air Purifier - Neck-Hanging Portable Electronic Mask
$298.00
Teruisi Electric Fruit and Vegetable Slicer, Multifunctional Chopper for Cafeterias and Hotels, Cutter for Green Onions, Chili Peppers, Radishes, and Ginger
$3,798.00
Waterproof Phone Pouch for Diving, Swimming, Rafting, and Hot Springs, Sealed Underwater Storage Bag with Waist Strap
$12.90
Premium Thick Cardstock Lin Zexu Representative Small Regular Script Infinite Life Sutra Close-Up Copying Calligraphy Copybook Regular Script for Beginners
$39.80
Zunjue Ticket-style 100% Cotton Watercolor Paper 300g Cold Press for Artists with Deckled Edges
$10.20
Kids' 3D Printing Pen – 3D Stereoscopic Drawing Toy for Girls, Perfect Birthday Gift
$104.66
Mifaner Handmade Watercolor Sketchbook – Oil Painting Series Canvas Journal, Travel-Friendly Mini Notebook for Acrylic Markers
$16.90
(Sasha Exclusive) Fat Small Card
$1,399.00
Silicone Faucet Side Drain Mat, Foldable Splash-Proof Pad for Kitchen Sink and Bathroom Washbasin
$4.93
Breathable Portable Invisible Aligner Case with Lanyard – Durable Hygienic Storage for Orthodontic Retainers and Dentures
$18.10
Snail-Specific Slug & Snail Killer Scatter-Type Anti-Pest Granules for Vegetable Gardens Slugs Apple Snails Fruit & Vegetable Fields
$10.00
Industrial Scouring Pad for Woodworking, Paint Sanding, and Polishing - Ultra-Fine Hand-Tear Sheets
$135.70
Custom G80 Manganese Steel Lifting Chain - High-Strength Alloy Chain Rigging for Hoisting and Cranes
$655.00
High-Concentration Oxygen Generator for Aquaculture with High-Pressure Outlet, Ceramic Nano Disc, and Oxygen Dissolution Cone
$50.00
Paint Brush Rinser – Art Supply Cleaning Cup for Brushes, Palettes, and Pigment Washing
$21.80
Heidelberg Printing Press Paper Pressure Wheel Screen Printing Roller Felt Wheel Guanghua Beiren Paper Feed Wheel Laminating Machine Brush Wheel
$6.00
Baofeifan Bubble Squeeze Painting Kit for Kids - Foaming Textured Paper, Wood Pulp Cotton DIY 3D Art with Markers
$10.00
Westwood Portable Retainer Case for Elderly Dentures and Children's Orthodontic Correctors, Storage Box
$14.20
PELICAN 1510 Protective Safety Case with Trolley - Waterproof Travel Box for Outdoor Photography Gear
$1,360.00
![Haisen [Exclusive Purchase Link] Livestream Link for New Arrivals and Clearance - Incense Sticks, Coil Incense, Agarwood, Sandalwood, Powder, Burners](https://www.gosteppe.com/cache/small/product/268968/legacy-main-4bd453bbd9b19100c4fd925a.webp)
Haisen [Exclusive Purchase Link] Livestream Link for New Arrivals and Clearance - Incense Sticks, Coil Incense, Agarwood, Sandalwood, Powder, Burners
$13.80
Ultralight Silicone-Coated Waterproof Dry Bag for Outdoor River Trekking, Rafting, Swimming, Beach Use – Wet/Dry Separation Storage for Swimwear and Towels
$38.20
Food Warmer Cabinet, Room Temperature Commercial Constant-Temperature Display Case, Egg Tart Heating Cabinet, Small Countertop Sample Retention Cabinet, Chestnut, White
$239.00
Ultra-Narrow 8/9/10cm Bathroom and Kitchen Gap Storage Rack with Wheels
$15.90
![[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)
