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.
Dancolin Blending Stump Set for Oil Pastels, Art Student Tools for Heavy-Color Oil Painting, Dual-Tip Pointed and Round DIY Soft Wax Drawing, Smudging, Mixing, Highlighting, Erasable Knife for Painting and Color Blending
$16.80
Shanlian Hubei Brush Small Perfect Brush Washer - Ceramic Ink Dish, Calligraphy Cleaning Tool, Moisturizing Water Pot, Art Supply Decor
$14.20
Yanyu Mineral Water Fish Tank Stand - Triangular Bracket for Inverted Bottle Self-Made Water Circulation System
$17.05
Jingdezhen Pink Peony Flourishing Tea Canister Ceramic Lidded Loose Tea Storage Jar CYG-4578 One Jin Capacity Pu'er
$450.60
Round Sponge Brush Stamp with Mushroom Head – Printing Tool for Kindergarten Art and Kids' Crafts
$0.27
Metal Wick Centering Tool with Wooden Base for DIY Scented Candle Making
$1.28
Custom Temporary Bank Account Opening Sign, Company Signboard, Stainless Steel Door Plate, PVC Simple Plaque, Acrylic Advertising Board
$15.20
Natural Raw Crystal Diffuser Stones 500g - Same Style as Certain Summer Brand, Flameless Indoor Decor (White, Green, Purple, Yellow, Black, Blue)
$10.20
Iron Chain, Flower Pot Hanging Chain with Iron Rings, Black Suspension Chain for Bird Cages and Garden Planters
$0.10
Sheepskin Rattle with Brass Bells - Handmade Wooden Peach Wood Baby Toy for Chewing, Perfect for Children's Day
$10.80
Commercial Square Insulated Warmer Cabinet with Constant Temperature Heating, Countertop Display Case for Roast Duck, Chicken, Fried Chicken, Smoked Goose, and BBQ Meat
$338.00
PISEN Desktop Cable Organizer - Magnetic Data Cord Manager, Soft Silicone Fixed Wire Winder with Adhesive Clips, Mini Portable Hub
$10.10
Handcrafted Peach Wood and Sheepskin Rattle with Brass Jingle Stick – Traditional Chewable Wooden Baby Toy
$74.00
DC Drive DCS550-S02-0050-05-00-00
$10,838.20
Waterproof Storage Bag for Clothes and Bathroom Use, Large-Capacity Drawstring Organizer for Men and Women, Outdoor Travel and Toiletry Pack
$39.90
Steel Speed Bump with Rubber Surface for Cars and Railways
$3,668.00
Huaboshi Thickened Resin Vegetable Planter Box – Rectangular Plastic Balcony Grow Container with Drainage Tray
$45.99
New Data Cable Storage Bag Travel Digital Charger Cord Organizer Protective Visible Multi-Use Portable Case
$1.64
Press Wash Blade for KBA Printing Presses - Model KBA105 Ink Scraper, 1160*40mm
$40.50
Genuine Pirelli Run-Flat Car Tire P7 225 245 275 285/35 40 45 R18 19 20 21
$336.00
Chuangshidai 100XP Compact Desktop Fume Extractor for Soldering Irons - Rapid Smoke Purification
$696.00
Multi-Function Kitchen Sink Rack - Dish Drying Organizer for Bowls and Plates
$33.10
Water Brush Kids Water Painting Book Graffiti Special Pen Water Sketchbook Eco-Friendly Safe Tap Water Refillable Pen Set
$2.16
No-Drill Over-Toilet Storage Rack for Bathroom Restroom Organizer
$8.90
Jingdezhen Blue and White Porcelain Antique Brush Washer, Traditional Chinese Painting Calligraphy Brush Rinse Basin, Large and Small Water Pots
$16.90
Sketch Blending Stump Set for Art Students - Highlight Detail Shadow Tool Kit with Replacement Sponge Heads for Beginners
$9.00
Changyiyou Outdoor Large-Capacity Wheeled Duffel Bag - Thickened Storage Backpack with Wheels for Camping Gear and Travel
$109.00
Lightweight Waterproof Dry Bag for River Trekking and Rafting – Travel Storage for Clothes, Shoes, Socks with Moisture-Proof Buckle, Roll-Top Carry Design
$15.80
Tupai 3D Self-Adhesive Wall Stickers, Custom Acrylic Logo Advertising Letters for Signage, Background Walls, and Image Wall Decor
$8.50
Durable Replacement DEUBLIN 525/357 Water Inlet/Outlet Rotary Union for Curved Surface Printing and Cup Printing Machines
$300.00
![[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)
