Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Model Number | MQ-2/135/3/7/9 |
| Detection Gases | Smoke, Alcohol, Hydrogen, CO, LPG, Propane |
| Operating Voltage | 5V DC |
| Interface Type | Analog and Digital Output |
| Heater Voltage | 5.0V ± 0.2V |
| Load Resistance | Adjustable via Potentiometer |
| Preheat Time | 24-48 Hours |
| Working Temperature | -10°C to 50°C |
| Humidity Range | Less than 95% RH |
| Compatibility | Arduino, Raspberry Pi, STM32 |
Anonymous
Mar 23, 2026
Rating: 5/5
Works well in automation setups
Integrated this into my greenhouse monitoring system to detect any faulty heating equipment. It has been running for two months without issues. The sensitivity to carbon monoxide is a great feature.
Anonymous
Mar 14, 2026
Rating: 4/5
Great for learning embedded systems
Excellent component for students and makers. The documentation online is plentiful. My only minor complaint is that the pins are a bit close together, so careful soldering is required if you want to add headers.
Anonymous
Mar 12, 2026
Rating: 5/5
Reliable gas detection
I used this for a prototype gas leak detector. The digital output threshold is easily adjustable with the onboard potentiometer. It triggered my alarm system reliably during testing with lighter fluid vapor.
Anonymous
Mar 11, 2026
Rating: 5/5
Perfect for my home safety project
This sensor module works exactly as described. I connected it to my Arduino Uno and was able to detect smoke and alcohol vapors within minutes after the preheat cycle. The analog output is stable and easy to calibrate.
Anonymous
Mar 11, 2026
Rating: 4/5
Good value but needs patience
The sensor is sensitive and responsive. Just remember that it requires a long preheat time (about 24 hours) before giving accurate readings. Once warmed up, it detects combustible gases very well.
Anonymous
Mar 09, 2026
Rating: 3/5
Decent but power hungry
The sensor functions correctly, but the internal heater draws quite a bit of current. Make sure your power supply can handle at least 150mA continuously. Otherwise, it performs as expected for the price.
Q: Can this detect natural gas leaks specifically?
A: Yes, the MQ-2 sensor is sensitive to liquefied petroleum gas (LPG), propane, and methane, which are common components of natural gas.
Q: How do I adjust the sensitivity threshold?
A: There is a blue potentiometer on the board. Turn it clockwise to increase sensitivity (lower threshold) or counter-clockwise to decrease sensitivity.
Q: What is the recommended preheat time before first use?
A: We recommend a preheat time of 24 to 48 hours for the sensor to stabilize and provide accurate baseline readings.
Q: Does this module come with header pins soldered?
A: No, the module typically comes without header pins soldered to allow for flexible mounting options. You will need to solder them yourself if required.
Q: Is the output signal 3.3V or 5V compatible?
A: The module operates on 5V. While the analog output can be read by 3.3V microcontrollers, ensure the voltage levels are compatible or use a voltage divider to protect 3.3V logic inputs.
Kimberly-Clark 41412 WYPALL X70 All-Purpose Wipes - Oil/Absorbent/Solvent Resistant Shop Towels
$110.00
EMG 60/85/81/81TW/89/89R Active Dual-Coil Guitar Pickups - Cuttable and Ready to Install
$910.00
Retainer Storage Case with Mirror for Cleaning and Soaking Portable Orthodontic Aligner Box
$24.93
Suitable for 195/55R15 & 195/60R15 Used Tires Year-Round Supply Low Price Guaranteed Quality
$80.00
Sink Drain Rack Corner Hanging Basket - Kitchen Sponge and Cloth Organizer, Multi-Function Home Storage Solution
$13.73
Magnetic Refrigerator Side Storage Rack - No-Drill Wall Organizer for Spices and Utensils
$9.10
Multi-Function Car Tire Stone Removal Hook Tool for Picking and Digging Out Debris
$7.35
Suction Cup Sink Strainer - Disposable Kitchen Drain Filter for Food Scraps and Waste
$14.30
Kimberly-Clark Wiper Paper, Industrial Cleaning Wipes for Oil and Grease, Factory & Laboratory Use
$963.52
Loose Gold Rutilated Quartz Beads, Donghai Agate, Chalcedony, Jade, Cat's Eye, Titanium Crystal, Aquamarine, White and Yellow Crystal Single Beads for Bracelets
$8.42
Faucet Drain Mat, Non-Slip Countertop Pad for Kitchen and Bathroom, Splash-Proof Sink Organizer, Thickened Mold-Resistant Silicone Mat
$3.78
New Pirelli Tire 255/40R20 101W AO PZERO PZ4 with Silent Cotton Original Fit for Audi A6L
$1,358.00
Oriental Pearl Dual Porcelain Jar Gift Set: Green Tea, Black Tea, Jin Jun Mei, Pu'erh Loose Leaf Tea in Porcelain Jars
$149.00
Purified Water Bucket Stand Inverted Water Dispenser Pump Simple Mineral Water Drinking Machine Press Pump
$10.80
New Children's Gouache Paint Brushes DIY Hand-Painted Graffiti Art Class Watercolor Acrylic Paint Brushes Bristle Round Tip Brush
$6.41
Natural Clear Quartz Fully Clean Untreated Faceted Round Rice Beads - For Women's Bracelets, Spacer Beads, and DIY Crafts
$6.63
Sponge Brushes for Kids' Crafts and Creative Painting - Student Art Stamping Tools, DIY Sponge Paintbrushes
$13.86
Jiuchenggong Liquan Ming Tang Dynasty Ouyang Xun Yao Mengqi Copybook, Regular Script Brush Calligraphy Workbook, 3 Volumes, 188 Pages
$17.90
Shaped Watercolor Paper Ticket Stubs - Blank Postage Stamp Bookmarks with Serrated Edges, Thickened 300g Premium Cotton Pulp, Fine Texture for Art Hand Painting, Easy Blending, High Absorbency, Wrinkle-Resistant - Perfect for Postcards and Creative Cards
$9.85
Naitong Automatic Retractable Air Hose Reel with PU Braided Hose for Pneumatic Tools and Car Detailing
$119.00
Premium Wall-Mounted Aromatherapy Empty Bottle – 100ML Plastic Square Diffuser Bottle with Wall-Mount Adhesive Sticker
$2.98
Leyingfang Floating Pen for Kids' Water Drawing, Colorful Water-Soluble Suspended Markers, Erasable Watercolor Pens
$13.80
Loose Rose Quartz Beads, Donghai Agate, Chalcedony, Jadeite, and Madagascar Pink Crystal for DIY Jewelry Making
$6.72
Expandable Stainless Steel Sink Rack, Multi-Function Kitchen Drain Board for Fruits, Vegetables, and Utensils
$14.90
Transparent Retainer Case Aligner Storage Box Portable Carry-On Squeeze Bag Orthodontic Appliance Rubber Band Cleaning Box
$18.50
Transparent Data Cable Organizer Bag for Travel - Portable Multi-Use Visible Storage for Digital Chargers and Cable Management
$7.36
Finished Seal Calligraphy Finished Stone Stamp Sellos Chines
$108.58
Chunfei Grocery Store Commuter Hard Fork Low-Beam Mountain Bike for Urban Roads, Suburbs, School, and Outings
$2,247.00
6-Cavity Large Square French Flower DIY Soap Silicone Mold for Essential Oil and Milk Soap
$4.93
Home Balcony Vegetable Planter - Self-Watering Plastic Pot for Strawberries and Succulents
$28.00
![[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)
