Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Sensor Type | MQ-3 Semiconductor Gas Sensor |
| Detectable Gas | Alcohol, Ethanol, Methane |
| Operating Voltage | 5V DC |
| Output Signal | Analog (AO) and Digital (DO) |
| Sensitivity Range | 0.04mg/L - 4mg/L (Alcohol) |
| Response Time | < 10 seconds |
| Recovery Time | < 30 seconds |
| Heater Voltage | 5V ± 0.2V |
| Load Resistance | 200kΩ (Adjustable) |
| Board Dimensions | 32mm x 20mm x 14mm |
Anonymous
Mar 30, 2026
Rating: 4/5
Works well but gets hot
Functionality is spot on for detecting alcohol concentration. Note that the heating element gets quite hot during operation, which is normal for this type of sensor, but ensure your enclosure has ventilation. Overall satisfied.
Anonymous
Mar 25, 2026
Rating: 4/5
Good sensitivity, needs warm-up
The sensor is very sensitive to ethanol vapors. Just remember that it needs about 2-3 minutes to warm up before giving accurate readings. Once heated, the response is quick. Documentation could be better, but plenty of tutorials exist online.
Anonymous
Mar 16, 2026
Rating: 3/5
Decent but requires calibration
The sensor works, but don't expect plug-and-play precision out of the box. You must spend time calibrating it in fresh air and then with a known alcohol source to get meaningful data. Good for hobbyists, maybe not for industrial use without extra work.
Anonymous
Mar 12, 2026
Rating: 5/5
Easy to interface with microcontrollers
Connected this to an ESP32 without any issues. The voltage levels are compatible, and the signal is clean. I used it to build a simple safety alarm for a home brewing setup, and it triggers reliably when ethanol levels rise.
Anonymous
Mar 04, 2026
Rating: 5/5
Reliable for classroom kits
We bought ten of these for our robotics club. They are robust and handle student handling well. The dual output (analog and digital) is excellent for teaching different ways to read sensor data with Arduino.
Anonymous
Mar 02, 2026
Rating: 5/5
Perfect for my breathalyzer prototype
This module works exactly as described. The analog output is stable after the initial warm-up period, and the digital threshold potentiometer makes it easy to calibrate for specific alcohol levels. Great value for electronics projects.
Q: Does this module come with headers soldered?
A: Yes, the module typically comes with the pin headers pre-soldered, ready for immediate use with breadboards or jumper wires.
Q: Is the digital output pin active high or active low?
A: The digital output (DO) state depends on your calibration via the onboard potentiometer. Typically, it goes LOW when the gas concentration exceeds the set threshold and HIGH when it is below the threshold, but this can be inverted by adjusting the comparator settings if your board supports it.
Q: How long does the sensor last before needing replacement?
A: Under normal operating conditions, the MQ-3 sensor element has a typical lifespan of 1 to 2 years in air. Continuous exposure to high concentrations of corrosive gases may reduce this lifespan.
Q: What is the power consumption of this sensor?
A: The heater inside the sensor consumes approximately 150mW to 200mW at 5V. Please ensure your power supply can provide at least 200mA to maintain stable operation.
Q: Can this detect methane gas as well?
A: While the MQ-3 is primarily optimized for alcohol and ethanol, it does have some cross-sensitivity to methane and other combustible gases. However, for dedicated methane detection, we recommend the MQ-4 or MQ-5 sensors for better accuracy.
UHT Ultra-High Temperature Sterilizer, Room-Temperature Set Yogurt Production Line, Yogurt Processing Equipment, Stirred Yogurt System
$80,640.00
Professional Sketch Blending Kit for Art Students: Gray Tone Pencils, Sponges, Stumps, and Erasers
$4.17
Custom Solid Wood Signboard with Engraved Lettering, Advertising Carved Plaque for Homestays, Tea Rooms, Studios, Wooden Entrance Hanging Sign
$16.90
MOKO Stainless Steel Expandable Dish Drainer - Multi-Function Kitchen Sink Rack for Bowl and Plate Storage
$28.00
WoSporT Factory Direct WST Safety Case 32cm (12.6 inch) - Dustproof, Waterproof, and Impact-Resistant Tool Box
$95.00
South Korea DIO Dental Implant / Implant + Abutment + Crown
$1,580.00
40cm Extended Drill Attachment with Scouring Pad Head for Polishing, Rust Removal, and Marble Countertop Cleaning
$60.00
Authentic Ou Style Tian Kaishu Thousand Character Classic Calligraphy Card for Adult Practice, High-Definition Coated Paper
$55.10
Zer0g Ultra-Light 14g Backpack Waterproof Liner - Polycro Odor-Barrier Pack Liner for Hiking and Trekking
$21.20
Touchmark Liquid Acrylic Markers with Soft Tips, Specialized for Elementary School Art, Ideal Birthday Gift for Children
$18.90
Paper Blending Stump for Sketching - Professional Art Tool with Blade for Highlights, Pastels, and Oil Pastels
$3.74
Wen Zhengming Small Regular Script Love Lotus Essay Brush Tracing Practice Copybook Calligraphy Paper Copying Custom Wholesale for Beginners
$8.80
Heavy-duty Industrial Scouring Pad Roll with Aluminum Oxide for Stainless Steel Polishing and Rust Removal
$57.52
1.06m Leather Slitting Machine – Wide-Range Strip Cutter for Leather, Luggage, and Rubber Materials
$16,250.00
Ceramic Double-Boiler Steaming Bowl with Lid – Ideal for Eggs, Bird's Nest, Custard, and Soup for Home or Commercial Use
$21.11
![[Ya Que You Sheng] DT900 PRO X Calibration File V2 Version EQ Equalization](https://www.gosteppe.com/cache/small/product/269040/legacy-main-a3c0c55ffaafe89c05afced1.webp)
[Ya Que You Sheng] DT900 PRO X Calibration File V2 Version EQ Equalization
$15.00
Ceramic Rabbit Egg Holder, Creative Irregular Egg Stand, Home Breakfast Small Dish, Craft Gift Ornament
$44.78
Hot-Selling Wire Money Tree Bonsai Base – Ceramic Pot for Wealth Attraction Incense
$37.00
Maike Outdoor Sports Waterproof Backpack Wet-Dry Separation Ski Bag Fishing Creek Fins Multi-Function Gear Storage
$152.00
Viral NFC Chip Stickers for Music Wall - Adhesive Read/Write Tags for Song Scanning, Cards, and Photo Frames
$2.38
Rechargeable Generation 2 Personal Air Purifier - Safe Portable Electric Fan for Travel Commuting and Flights
$181.00
Integrated Sink Splash Guard with Silicone Drain Mat - Auto-Draining Countertop Organizer
$23.30
Ultra-Light Aluminum Camping Light Pole – Foldable Mini Lamp Stand for Outdoor Picnics and Tabletop Use
$8.33
bimoz Under-Desk Cable Organizer No-Drill Shelf for Home Office Socket Strip Router Wire Data Cable Fixer Minimalist Wire Winder Dual-Side Mount Ventilated Design
$40.80
Extended Deep-Cut External Thread Tool Holder with Relief Groove for Swiss-Type Lathe HKFF42R6001
$15.50
Meiao Dental Imported Dental Implant Package, Swiss ITI Straumann Implant Abutment, False Teeth, Filling, and Planting
$14,188.00
Assorted Colors Kids' Painting Crayons - Washable Oil Pastels in 12, 18, 24, or 36 Colors for Graffiti and Coloring
$2.47
Fruit and Vegetable Slicer - Stainless Steel Commercial Electric Multi-Function Shredder for Radish, Potato, Cucumber, Pepper, Automatic
$2,880.00
CAAS-Developed Granular Insecticide and Fungicide for Vegetable Gardens – Soil Pest Control and Fertilizer for Enhanced Vegetable Growth and Yield
$13.50
Marie's C6823 Sketch Blending Stumps (3-Pack), Professional Charcoal and Pastel Smudging Tools for Art Students and Beginners, Hard/Small/Highlight Set on Newsprint
$7.48
![[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)
