Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Sensor Type | MQ-7 Semiconductor Gas Sensor |
| Detection Target | Carbon Monoxide (CO) and Combustible Gases |
| Operating Voltage | 5V DC |
| Output Signal | Analog Voltage (0-5V) and Digital TTL |
| Heating Voltage | 5.0V ± 0.2V |
| Load Resistance | Adjustable via On-board Potentiometer |
| Response Time | < 30 Seconds |
| Recovery Time | < 60 Seconds |
| Interface | 3-Pin Header (VCC, GND, DO/AO) |
| Dimensions | 32mm x 20mm x 14mm |
Anonymous
Mar 25, 2026
Rating: 5/5
Great addition to my workshop alarm
I built a custom ventilation trigger for my garage workshop. This sensor reliably triggers the fan when I run the engine indoors. It gives me peace of mind knowing the system is monitoring CO levels actively.
Anonymous
Mar 19, 2026
Rating: 4/5
Good sensitivity, needs warm-up
The module detects CO very well once it has warmed up. Just remember that these sensors need about 24-48 hours of initial burn-in for best stability, and a few minutes of warm-up each time you power them on. Otherwise, solid performance.
Anonymous
Mar 09, 2026
Rating: 5/5
Reliable for student projects
We bought ten of these for our university robotics lab. They are consistent across all units and handle the 5V logic level perfectly. The build quality is decent for a hobbyist component.
Anonymous
Mar 07, 2026
Rating: 5/5
Perfect for Arduino Safety Projects
This sensor works exactly as described. I integrated it into a home safety prototype using an Arduino Uno. The analog output is stable, and the digital threshold is easy to adjust with the onboard potentiometer. Great value for the price.
Anonymous
Mar 03, 2026
Rating: 5/5
Easy to interface
Plug and play with Raspberry Pi and Arduino. The documentation online is plentiful, and the module itself is straightforward. The LED indicator is a nice touch for quick visual debugging.
Anonymous
Mar 02, 2026
Rating: 4/5
Works well but consumes power
The detection capability is excellent. However, keep in mind the heating element draws significant current (around 150mA), so it's not ideal for battery-powered applications unless you implement a sleep cycle. For plugged-in projects, it's great.
Q: Can I connect this directly to a 3.3V microcontroller like ESP32?
A: The sensor requires a 5V supply for the heater to function correctly. While the analog output may work with 3.3V logic, it is safer to use a voltage divider or a logic level converter for the signal pin to protect your 3.3V board.
Q: Does this module come with a library for Arduino?
A: The hardware itself does not include a physical library card, but there are many open-source libraries available in the Arduino IDE Library Manager (search for 'MQ-7' or 'Gas Sensor') that make reading the analog values very easy.
Q: What is the lifespan of the heating element?
A: Under normal operating conditions with proper voltage, the heating element typically lasts for several thousand hours. Continuous operation without cycling is recommended for the most stable readings during the measurement phase.
Q: Can this sensor detect natural gas or just carbon monoxide?
A: While primarily calibrated for Carbon Monoxide (CO), the MQ-7 is also sensitive to other combustible gases like hydrogen, methane, and propane. However, for specific natural gas leak detection, an MQ-5 or MQ-6 might offer better specificity.
Q: How often should I calibrate the potentiometer?
A: You generally only need to set the potentiometer once during your initial setup to define the threshold for the digital output pin. Unless your environmental conditions change drastically, re-calibration is rarely needed.
Tianzheng DZ15LE-100/3N901T 100A Transparent Leakage Circuit Breaker, Molded Case Circuit Breaker 3901T 63A
$278.00
![[Daimai Holds Micro-Needle Hair Transplant Patent] Little Red Cap Hydro Glow | Scalp Hydration and Repair](https://www.gosteppe.com/cache/small/product/270424/legacy-main-ecbdc6ee4688639f4a8ef150.webp)
[Daimai Holds Micro-Needle Hair Transplant Patent] Little Red Cap Hydro Glow | Scalp Hydration and Repair
$880.00
Pelican Rolling Case pelican1560 - Waterproof Shockproof Safety Case for Photography Equipment and Instruments
$1,550.00
Disipulai Hot Air Circulation Vertical Food Warmer Display Cabinet - Adjustable Temperature Countertop Cooked Food Warming Equipment
$2,023.00
Complete Pasteurization Production Line for Pomegranate, Grape, Orange, Apple Juice, and Mare's Milk
$6,048.00
Portable Tire Stone Removal Tool - Essential Handheld Hook for Car Owners
$13.73
Factory Direct Longan 160 Curved Hot Stamping Machine Fully Automatic Hot Foil Printer Pneumatic Heat Press Leather Embossing Machine
$10,000.00
Bean Sprout Germinator Tray, Hydroponic Vegetable Growing Container, Soil-Free Pea Sprouting Pot
$14.06
TOPTOY Crayon Shin-chan Memory Echo Series Blind Box - Anime Figure Collectible Toy and Birthday Gift
$47.20
Natural Lightning Cat's Eye Yellow Tiger Eye Loose Beads, Single Crystal Beads for DIY Bracelets and Accessories
$3.91
Pirelli Tire 235/55R19, Original Equipment for Mercedes-Benz GLC, Genuine Tire Compatible with Audi/Land Rover/etc.
$512.00
Biliansheng Hair Transplant: No-Shave Hairline Restoration, Top Thinning Density Enhancement, Nationwide Chain
$9,999.00
Luru Authentic 15-Note Steel Tongue Drum - Professional Grade for Beginners, Adults, and Children
$500.00
![MOOCAT [Postage Stamp Stub] Hand-Drawn Blank Irregular Wood Pulp Fine-Texture Paper for Cyanotype, OC Signing, and Collage](https://www.gosteppe.com/cache/small/product/270412/legacy-main-3037a70329c5379f7064bc16.webp)
MOOCAT [Postage Stamp Stub] Hand-Drawn Blank Irregular Wood Pulp Fine-Texture Paper for Cyanotype, OC Signing, and Collage
$9.90
Used Car Tires - Sizes 155/165/175/185/195/205/215 for 13/14/15/16 inch Rims
$140.00
Pin Puller Extractor Mechanical Repair Tool Bearing Puller and Locating Pin Extractor
$76.50
Water Brush Pen Set with Large Capacity - Essential Tools for Beginners Using Gouache, Solid Watercolor Paints, and Line Drawing; Perfect for Art Students
$32.00
C9335 Automotive Brake Disc Lathe – Resurfacing, Boring, Grinding & Polishing Machine
$16,005.00
Jaguar Tire Lug Nuts Compatible with XE/XF/XJL/F-TYPE/F-PACE - Wheel Hub Screw Caps for Modification
$118.00
Three-Hook Tire Stone Removal Tool, Wheel Groove Cleaner for Removing Stones from Vehicle Tires
$4.80
Pad Printer Accessories: 4-Inch Blade Clamp, Blade Holder, and Doctor Blade Assembly
$5.40
3M Industrial Scouring Pad 7447C, Metal Rust Removal, Stainless Steel Brushing and Polishing Cloth
$4.00
Qinghe Blazing Rose Series
$1,580.00
Cheddar Cheese Production Line, Front-End Processing and Deep Processing Machinery, Mozzarella Cheese Equipment
$25,480.00
MGQ Konjac Noodle Bubble Cleaning Machine, Fully Automatic Soaking and Lifting Washer
$17,555.40
Industrial Large Meat Grinder Fresh Meat Mince Chopper Fruit Vegetable Crusher Meat Grinding and Mixing Integrated Meat Filling Mixer
$32,030.00
Zhuolide D-302 UV Glue - Invisible Adhesive for Transparent Glass, Metal, Coffee Tables, and Crystal Glass, 250g Large Capacity
$130.00
Hell Training Rock Guitar by Shinichi Kobayashi: Electric Guitar Tutorial for Speed Playing
$106.00
![[Buy One Get One Free] Natural Agarwood, Sandalwood, and Cypress Incense Powder Set with Electric Burner](https://www.gosteppe.com/cache/small/product/270397/legacy-main-04181167165316608773b986.webp)
[Buy One Get One Free] Natural Agarwood, Sandalwood, and Cypress Incense Powder Set with Electric Burner
$8.42
Quilt Storage Bag – Large-Capacity Waterproof & Moisture-Proof Moving Pack for Clothes, Luggage, and Comforters
$10.10
![[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)
