Description
Reviews
| Brand | - |
| Category | Electronic Components / Maker DIY / Computer Hardware, Monitors & Peripherals |
| Origin | - |
| Model Series | MQ-2, MQ-3, MQ-4, MQ-5, MQ-7, MQ-8, MQ-9, MQ-135 |
| Operating Voltage | 5V DC |
| Load Resistance | 20 KΩ |
| Heating Resistance | 33 Ω ± 5% |
| Heating Consumption | ≤ 800 mW |
| Sensing Resistance | 10 KΩ - 60 KΩ |
| Output Signal | Analog Voltage & Digital TTL |
| Interface Type | 4-Pin Header (VCC, GND, DO, AO) |
| Operating Temperature | -10°C to 50°C |
| PCB Dimensions | 32mm x 20mm x 22mm |
Anonymous
Apr 13, 2026
Rating: 5/5
Reliable MQ-2 Module
Bought the MQ-2 variant. Responds quickly to lighter fluid smoke. Good build quality on the PCB.
Anonymous
Mar 02, 2026
Rating: 4/5
Needs warm-up time
Remember to let it heat up for 24 hours initially for best results. Otherwise works as expected for the price.
Anonymous
Feb 17, 2026
Rating: 5/5
Great for Arduino projects
Works perfectly with my Uno. Calibration took some time but sensitivity is good. Make sure to let it warm up before taking readings.
Anonymous
Feb 14, 2026
Rating: 5/5
Perfect for thesis project
Used for gas leakage detection system. Analog output is stable after warm-up. Easy to interface with microcontrollers.
Anonymous
Jan 18, 2026
Rating: 4/5
Good sensitivity
Detects smoke well. Note that this is for prototyping and education, not certified safety equipment for home installation.
Q: Can I use this with 3.3V logic?
A: The sensor heater needs 5V, but the DO output can be adjusted. Use a level shifter for IO if connecting to 3.3V boards.
Q: Does this work with Raspberry Pi?
A: Yes, via the analog pin using an ADC chip or the digital pin directly connected to a GPIO pin.
Q: How long before it reads accurately?
A: We recommend a 24-hour initial burn-in, then 5-10 minutes warm-up per use for stable readings.
Q: Is the digital output adjustable?
A: Yes, there is a potentiometer on the board to adjust the threshold sensitivity for the digital output pin.
Q: Which model detects alcohol?
A: The MQ-3 model is specifically calibrated for alcohol vapor detection among the available variants.
Hairline Transplant | No-Shave Hair Transplant | 1-1500 Units Long Hair Planting for Natural Flow and Volume - Department Director Service
$25,800.00
Zhong Yao Xuan Shi Biao Small Regular Script Hard Pen Copybook, 1.8cm Column Width, Tear-Off Sheets for Precise Tracing – Source of Regular Script
$29.70
Chunfei Grocery Store Yun'an GR02 Gravel Bike Thru-Axle Disc Brake Lightweight Touring with Multiple Rack Mounts
$8,974.00
Anti-Tangle High-Strength Grade 100 Lifting Chain for Industrial Hoisting
$776.44
DIY Rose Essential Oil Handmade Soap Customization
$35.00
Adjustable Height Simple Storage Shelf - Wooden and Iron Bookcase, Steel-Wood Supermarket Display Rack
$256.00
DIY Handmade Soap Mold - Carnation Flower Rectangular Silicone Mold for Homemade Soap, Mother's Day Gift
$14.30
Fried Chicken Warmer Cabinet with Heat Lamp Small Single-Layer Insulated Box for Pies Youtiao Chestnuts and Roasted Sweet Potatoes Display Case
$500.00
Dried & Preserved Flower DIY Kit for Scented Candles – Ocean Style for Festivals, Team Building, and Workshops
$6.83
304 Stainless Steel Chain, Thickened Industrial Seamless Short/Long Link Chain for Lifting, Swing, or Dog Leash
$1.50
Large Bucket 502 Glue, Strong Instant Adhesive, Gold Material 502 Dry Glue for Leather, Metal, Furniture, and Plastic Bonding by Manufacturer
$1,893.00
Rectangular Plastic Vegetable Planter for Balcony - Durable Home Gardening Pot
$12.90
Chinese Painting Line Drawing Copybook, Gongbi Sketch Template, Large-Scale Tracing Album, Ancient Style Brush Control and Line Practice Book
$7.48
German Continental Tires 225/45R17 Run-Flat, 19-Inch Original Authentic with Full Tread Patterns
$380.00
Dynamic Sheet Music Simplified Notation Accompaniment for Electric Wind Instrument Saxophone Hulusi Ocarina Flute Bamboo Flute
$10.00
LL Industrial Lint-free Wiping Paper - Oil and Water Absorbent Non-woven Fabric (White/Blue Large Roll)
$185.82
Continental Quiet Used Car Tires 225/235/245/255/265-35/40/45/50 R17/18/19/20/21/22/23
$284.00
Negotiable Price: Siemens Load Cell 7mh4106-5ec11, Brand New Unused, Contact for Price Negotiation
$1,332.00
Premium Over-Toilet Storage Organizer, Wall-Mounted Bathroom Shelf, No Drilling Required, Multi-Function Toilet Rack
$31.76
Model 2000 Large Commercial Vegetable Cutter for Slicing, Dicing, and Cutting Leafy Greens and Kimchi
$11,000.00
Aromatherapy Candle Tool Set - Includes Igniter, Snuffer, Wick Trimmer, Flame Extinguisher Cover, and Rotating Carousel Ornament
$2.55
onlycook 304 Stainless Steel Kitchen Rack with Narrow Edge for Sink, Dishcloth Drainer, and Sponge Basket
$36.50
7-Piece Square Succulent Pot Set with Trays - Durable Plastic Colorful Root-Control Planters
$75.50
Minimalist Japanese Style Kitchen Sponge Brush Dish Soap Drain Rack Air-Dry Cloth Rack Sink Organizer Box
$21.00
PVC Cable Cover Speed Bump Style Wire Protector for Indoor Cables and Pipes
$9.10
Spiegel BGF-161 Portable Tire Stone Removal Hook - Multi-function Tool for Cleaning Car Tire Treads
$7.84
7A Natural Amethyst Purple Rabbit Hair Loose Beads for Women's DIY Bracelets and Snowflake Necklaces
$3.83
DIY Handmade Soap Silicone Mold, Essential Oil Soap, Creative Gift Soap Base and Aromatherapy Materials, Love Forever Design
$12.90
Flameless Aromatherapy Diffuser with Essential Oils, Dried Flowers, and Preserved Flower Decor
$13.60
DOUBLECOIN 7.00R16LT-14 (RSS2) All-Steel Radial Truck Tire - Economical and Wear-Resistant
$1,375.00
