Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Operating Voltage | 5V DC |
| Detection Gases | LPG, Propane, Hydrogen, Methane, Alcohol, Smoke |
| Output Signal | Digital Switch Output (0 and 1) & Analog Output |
| Heater Current | Approx. 150mA |
| Preheat Time | 24-48 Hours for stable readings |
| Sensitivity Adjustment | Adjustable via onboard potentiometer |
| Interface Type | 3-Pin Header (VCC, GND, DO/AO) |
| PCB Dimensions | 32mm x 20mm x 14mm |
| Material | FR-4 PCB with Tin Plating |
| Compatibility | Arduino, Raspberry Pi, ESP32, STM32 |
Anonymous
Mar 21, 2026
Rating: 5/5
Reliable analog and digital output
I appreciate having both analog and digital outputs on one board. It allows for flexible integration into my IoT gateway. The response time to combustible gases is impressively fast.
Anonymous
Mar 19, 2026
Rating: 4/5
Good value but needs patience
The module is solid and well-soldered. Just remember that it needs a long preheat time (about 24 hours) before the readings stabilize. Once warmed up, it detects alcohol and gas very reliably.
Anonymous
Mar 16, 2026
Rating: 3/5
Works well but gets hot
The sensor functions correctly and detects methane effectively. However, the heating element gets quite hot during operation, so ensure you have adequate ventilation in your enclosure.
Anonymous
Mar 09, 2026
Rating: 4/5
Great for learning electronics
Used this for my university final year project on air quality monitoring. Documentation online is plentiful, and the sensor behaves consistently. Deducting one star because the header pins were slightly loose upon arrival.
Anonymous
Mar 04, 2026
Rating: 5/5
Perfect for my home safety project
This sensor works exactly as described. I connected it to an Arduino Uno and had it detecting smoke within minutes after the initial preheat. The sensitivity pot makes it easy to calibrate for different environments.
Anonymous
Mar 03, 2026
Rating: 5/5
Sensitive and adjustable
The ability to adjust the threshold with the screwdriver is a huge plus. I set it to trigger only when smoke levels are genuinely concerning, avoiding false alarms from cooking steam.
Q: How do I calibrate the sensitivity threshold?
A: Use a small Phillips head screwdriver to turn the blue potentiometer on the board. Turn it clockwise to increase sensitivity (trigger easier) or counter-clockwise to decrease it. Test with a safe amount of target gas to find your sweet spot.
Q: What is the recommended preheat time before first use?
A: We recommend powering the sensor for at least 24 to 48 hours before relying on its readings. This burns off any manufacturing residues and stabilizes the internal heating element.
Q: Can this detect carbon monoxide specifically?
A: The MQ-2 is primarily sensitive to LPG, propane, hydrogen, methane, alcohol, and smoke. While it may react to Carbon Monoxide, the MQ-7 sensor is specifically designed and calibrated for accurate CO detection.
Q: Does this module require an external library to work with Arduino?
A: No external library is strictly necessary. You can read the digital output using a standard digitalRead() function and the analog output using analogRead(). Libraries are available if you want advanced calibration features.
Q: Is the output voltage compatible with 3.3V systems like ESP32?
A: Yes, the digital output can work with 3.3V logic, but for the best stability and analog reading accuracy, we recommend using a level shifter or powering the VCC at 5V while connecting the signal pin to the 3.3V MCU input.
Commercial and Home Dual-Head Stainless Steel Vegetable Slicer for Cafeterias and Restaurants - Direct from Manufacturer (Slices, Dices, Julienne)
$2,142.00
Mountain Ghost Spending Money Cinnabar Coloring Tool Five Emperor Copper Coin Coloring Wood Carving Stone Tablet Taishan Stone Inscription Non-Fading Landscape Buddha Guan Calligraphy Fine Brush Traditional Seal Script Coloring Pen Tracing
$17.60
Wide-Opening Chain Sling Assembly with Hooks - Heavy-Duty Lifting Gear, Iron Chains, and Crane Hoist Hooks
$145.00
Sketch Blending Stump Set for Artists, Detail Highlight and Shadow Smudging Tools, Cotton Swabs, Scraper, and Sponge Pen Refills
$6.80
Mini Watercolor Paint Set with Walnut Wood Board, Portable Easel, and Travel Sketchbook
$4.68
Modern Housewife Kitchen Sink Organizer - Foldable Dish Drying Rack and Storage Shelf
$44.20
Skid-Mounted Integrated Screw Air Compressor for Laser Cutting - 15kW/22kW/37kW, 16kg, Permanent Magnet VFD
$23,500.00
Wooden Handle Leather Rattle Drum Baby Toy Glue-Free Paint-Free for Ages 1+ Boys and Girls Wooden Shaker
$8.42
![[Folded Booklet] Liu Chunlin: Palace Examination Essay Final Zhuangyuan Small Regular Script Calligraphy Copybook Original Size Long Scroll](https://www.gosteppe.com/cache/small/product/269742/legacy-main-81360b2f385dab43c5030767.webp)
[Folded Booklet] Liu Chunlin: Palace Examination Essay Final Zhuangyuan Small Regular Script Calligraphy Copybook Original Size Long Scroll
$14.20
Stainless Steel Sponge Drain Rack - No-Drill Wall-Mounted Kitchen Sink Organizer for Steel Wool and Scrub Pads
$2.60
Analysis of Wang Duo's Classical Poetry Composition Techniques (50 Analyses + 50 Comparisons)
$89.00
Custom Sheet Music Transcription Service for 'Farewell Letter' for Saxophone, Clarinet, Flute, Trumpet, Violin, and Cello
$12.00
Japanese Surplus san-x Rilakkuma Bowl Set - Oven-Safe Bowl with Base and Two Forks for Ice Cream or Hot Pot
$69.90
Guangda Dental | Swiss Dental Implants Including Abutment, Implant Body, and Crown, Improves Chewing, Restores Missing Teeth
$3,900.00
50pcs Merry Christmas Gift Tags Printed White Paper Labels X
$26.44
Kabaxiong Color Gel Pens - Retractable Morandi Style, High-Aesthetic Japanese INS Set for Journaling and Marking
$8.88
Continental Tires 225 235 245 255 275/35 40 45 50 55R17 18 19 20 21 22
$350.00
Portable Invisible Aligner Case for Orthodontic Retainers - Compact, Breathable Storage Box for Teeth Correctors and Dentures
$18.80
Chushinmi Home Kitchen Sink Foldable Dish Drying Rack Bowl Storage Organizer Drainage Shelf
$59.40
Lanyard Invisible Aligner Case Retainer Storage Box Expander Corrector Holder Portable Breathable Storage Container
$11.42
1.3Cm Size Paper er Labels For Clothing Size Adhesive Printe
$30.44
Meike Air Neck-Worn Air Purifier - Removes Smoke, Odors, Haze, and Airborne Particles
$1,199.16
51 Song Ci Poems, Ou Style Medium Regular Script Brush Calligraphy Red-Tracing Workbook on Xuan Paper, Classic Beginner's Guide to Regular Script
$11.00
Michelin Car Tires - Multiple Sizes Available: 215, 225, 235, 245, 255/45, 50, 55, 60R17, R18, R19, R21
$299.00
RoHS Environmental Tester for Alloy Composition Analysis, Heavy Metal & Halogen Detection, and Metal Coating Thickness Measurement
$7,886.80
Mini Watercolor Paint Sketchbook for Markers, Compact and Portable Thick Paper Notebook for Students
$5.80
![Yonghe Hair Transplant [Standard Scalp Care] for Oily Scalp, Itchiness, Dandruff, Soothing Scalp and Hair Treatment](https://www.gosteppe.com/cache/small/product/269723/legacy-main-863af3438df0d0953cb801df.webp)
Yonghe Hair Transplant [Standard Scalp Care] for Oily Scalp, Itchiness, Dandruff, Soothing Scalp and Hair Treatment
$473.00
High-Strength Quick-Drying Plaster Powder for DIY Models, Dolls, Art Molds, and Aromatherapy Crafts
$7.48
4-Cavity Rectangular DIY Handmade Soap Mold for Custom Soaps, Breast Milk Soap, Essential Oil Soap Base - Silicone Tool
$27.20
100x Blank Kraft Paper Hang Tags Wedding Party Favor Label P
$64.90
![[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)
