Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Brand | TELESKY |
| Model Number | MQ-9 |
| Detection Gas | Carbon Monoxide, Combustible Gas |
| Operating Voltage | 5V DC |
| Output Signal | Digital Switch Output (0 and 1) |
| Analog Output | Yes (0-5V) |
| Preheat Time | Approx. 24 hours |
| Interface Type | 3-Pin Header (VCC, GND, DO) |
| Dimensions | 32mm x 20mm x 15mm |
| Application | Home Safety, Industrial Monitoring, DIY Projects |
Anonymous
Mar 31, 2026
Rating: 3/5
Functional but calibration takes time
The module functions correctly, but be patient with the calibration process. It took a few days of continuous power to get stable readings in our workshop environment. Good product overall once settled.
Anonymous
Mar 29, 2026
Rating: 5/5
Ideal for university projects
Used this for my final year engineering project on indoor air quality. The documentation provided by the seller helped me understand the circuit diagram quickly. Highly recommended for students.
Anonymous
Mar 26, 2026
Rating: 5/5
Perfect for my Arduino safety project
This sensor module works exactly as described. I connected it to my Arduino Uno and had readings within minutes after the initial preheat. The digital output threshold is adjustable via the potentiometer, which is very handy.
Anonymous
Mar 14, 2026
Rating: 4/5
Works well with Raspberry Pi
Integrated this into a home monitoring system using a Raspberry Pi. The analog reading allows me to graph gas levels over time. Only downside is the power consumption is slightly higher than expected during preheating.
Anonymous
Mar 12, 2026
Rating: 4/5
Good sensitivity, needs warm-up
The sensor is quite sensitive to gas leaks during testing. Just remember that it requires a long preheat time (about 24 hours) before the first use to stabilize the baseline. Once warmed up, it performs well.
Anonymous
Mar 02, 2026
Rating: 5/5
Great value for money
For the price, you cannot beat this module. It includes both analog and digital outputs, making it versatile for different microcontrollers. The PCB quality looks solid and the pins are well-soldered.
Q: Is the output voltage compatible with 3.3V logic systems?
A: The module operates at 5V. While the analog output scales with voltage, the digital output high level will be near 5V. For 3.3V systems like some ESP32 configurations, a voltage divider or logic level shifter is recommended for the digital pin.
Q: Does this module require an external library to work with Arduino?
A: No external library is strictly necessary for basic usage. You can read the digital output using a standard digitalRead() function and the analog output using analogRead().
Q: How do I adjust the sensitivity threshold for the digital alarm?
A: There is a blue potentiometer on the back of the PCB. Rotate it clockwise to increase sensitivity (trigger at lower gas concentrations) and counter-clockwise to decrease it.
Q: Can this detect natural gas or only carbon monoxide?
A: The MQ-9 sensor is designed to detect Carbon Monoxide (CO) as well as combustible gases like LPG, Propane, and Methane (natural gas).
Q: What is the exact preheat time required before the sensor is accurate?
A: We recommend a preheat time of at least 24 hours for the first use to ensure the sensor element stabilizes. Subsequent power cycles may require less time, but 20-30 minutes is advisable.
Nordic Creative Digital House Number Wrought Iron 3D Decor for Shops, Offices, Homestays, and Villas
$23.00
Piano Sheet Music Collection - Pop and Classical Scores, Tutorial Books, and Staff Notation for Piano and Electronic Keyboard (10,000 Songs)
$10.00
Natural Clear Quartz Faceted Tumbled Beads for DIY Jewelry Making, High-Quality Carved Beads for Bracelets and Necklaces
$1.80
Music Play Lao Wei Khalil Fong Guitar Chord Sheet - Digital Version
$9.00
Kimberly-Clark 41412 WYPALL X70 All-Purpose Wipes - Oil/Absorbent/Solvent Resistant Shop Towels
$110.00
EMG 60/85/81/81TW/89/89R Active Dual-Coil Guitar Pickups - Cuttable and Ready to Install
$910.00
Retainer Storage Case with Mirror for Cleaning and Soaking Portable Orthodontic Aligner Box
$24.93
Suitable for 195/55R15 & 195/60R15 Used Tires Year-Round Supply Low Price Guaranteed Quality
$80.00
Sink Drain Rack Corner Hanging Basket - Kitchen Sponge and Cloth Organizer, Multi-Function Home Storage Solution
$13.73
Magnetic Refrigerator Side Storage Rack - No-Drill Wall Organizer for Spices and Utensils
$9.10
Multi-Function Car Tire Stone Removal Hook Tool for Picking and Digging Out Debris
$7.35
Suction Cup Sink Strainer - Disposable Kitchen Drain Filter for Food Scraps and Waste
$14.30
Kimberly-Clark Wiper Paper, Industrial Cleaning Wipes for Oil and Grease, Factory & Laboratory Use
$963.52
Loose Gold Rutilated Quartz Beads, Donghai Agate, Chalcedony, Jade, Cat's Eye, Titanium Crystal, Aquamarine, White and Yellow Crystal Single Beads for Bracelets
$8.42
Faucet Drain Mat, Non-Slip Countertop Pad for Kitchen and Bathroom, Splash-Proof Sink Organizer, Thickened Mold-Resistant Silicone Mat
$3.78
New Pirelli Tire 255/40R20 101W AO PZERO PZ4 with Silent Cotton Original Fit for Audi A6L
$1,358.00
Oriental Pearl Dual Porcelain Jar Gift Set: Green Tea, Black Tea, Jin Jun Mei, Pu'erh Loose Leaf Tea in Porcelain Jars
$149.00
Purified Water Bucket Stand Inverted Water Dispenser Pump Simple Mineral Water Drinking Machine Press Pump
$10.80
New Children's Gouache Paint Brushes DIY Hand-Painted Graffiti Art Class Watercolor Acrylic Paint Brushes Bristle Round Tip Brush
$6.41
Natural Clear Quartz Fully Clean Untreated Faceted Round Rice Beads - For Women's Bracelets, Spacer Beads, and DIY Crafts
$6.63
Sponge Brushes for Kids' Crafts and Creative Painting - Student Art Stamping Tools, DIY Sponge Paintbrushes
$13.86
Jiuchenggong Liquan Ming Tang Dynasty Ouyang Xun Yao Mengqi Copybook, Regular Script Brush Calligraphy Workbook, 3 Volumes, 188 Pages
$17.90
Shaped Watercolor Paper Ticket Stubs - Blank Postage Stamp Bookmarks with Serrated Edges, Thickened 300g Premium Cotton Pulp, Fine Texture for Art Hand Painting, Easy Blending, High Absorbency, Wrinkle-Resistant - Perfect for Postcards and Creative Cards
$9.85
Naitong Automatic Retractable Air Hose Reel with PU Braided Hose for Pneumatic Tools and Car Detailing
$119.00
Premium Wall-Mounted Aromatherapy Empty Bottle – 100ML Plastic Square Diffuser Bottle with Wall-Mount Adhesive Sticker
$2.98
Leyingfang Floating Pen for Kids' Water Drawing, Colorful Water-Soluble Suspended Markers, Erasable Watercolor Pens
$13.80
Loose Rose Quartz Beads, Donghai Agate, Chalcedony, Jadeite, and Madagascar Pink Crystal for DIY Jewelry Making
$6.72
Expandable Stainless Steel Sink Rack, Multi-Function Kitchen Drain Board for Fruits, Vegetables, and Utensils
$14.90
Transparent Retainer Case Aligner Storage Box Portable Carry-On Squeeze Bag Orthodontic Appliance Rubber Band Cleaning Box
$18.50
Transparent Data Cable Organizer Bag for Travel - Portable Multi-Use Visible Storage for Digital Chargers and Cable Management
$7.36
![[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)
