Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Model Number | MQ-135 |
| Detection Gases | Ammonia, Sulfide, Benzene, Smoke, CO2 |
| Operating Voltage | 5V DC |
| Output Signal | Analog and Digital (TTL) |
| Preheat Time | 24-48 Hours |
| Sensitivity Adjustment | Potentiometer Included |
| Interface Type | 3-Pin Header (VCC, GND, OUT) |
| PCB Dimensions | 32mm x 20mm |
| Compatibility | Arduino, Raspberry Pi, ESP32 |
| Package Contents | 1x MQ-135 Module, 1x Pin Header Strip |
Anonymous
Mar 25, 2026
Rating: 4/5
Good value but needs patience
The module is solid and well-soldered. Just remember that you must let it preheat for at least 24 hours before trusting the data. Once warmed up, it detects smoke and alcohol vapors instantly.
Anonymous
Mar 23, 2026
Rating: 3/5
Works but gets hot
The sensor functions well, but the heating element gets quite warm to the touch. Make sure your enclosure has some ventilation holes. Otherwise, no complaints about performance.
Anonymous
Mar 23, 2026
Rating: 5/5
Great sensitivity
I tested this against a professional meter and the relative changes were very accurate. Excellent for detecting cooking fumes or poor ventilation in small rooms.
Anonymous
Mar 15, 2026
Rating: 4/5
Useful for monitoring
Using this in my greenhouse to monitor ammonia levels from compost. It triggers my exhaust fan reliably when thresholds are met. Would buy again.
Anonymous
Mar 15, 2026
Rating: 5/5
Perfect for my home automation project
This sensor works exactly as described. I connected it to my Arduino Uno and had readings within minutes after the initial preheat. The sensitivity adjustment pot is very responsive.
Anonymous
Mar 09, 2026
Rating: 5/5
Easy to integrate
Plug and play with ESP32. The analog output provides a smooth curve for graphing air quality over time. Documentation online is plentiful for this specific model.
Q: Can this detect carbon monoxide specifically?
A: The MQ-135 is sensitive to a broad range of harmful gases including CO, but it is not specific to Carbon Monoxide alone. For dedicated CO detection, an MQ-7 sensor is recommended.
Q: What is the power consumption?
A: The heating element typically draws about 150mA at 5V. Please ensure your microcontroller or power supply can handle this current load.
Q: Does this module output I2C data?
A: No, the MQ-135 module outputs analog voltage and a digital TTL signal. For I2C communication, you would need an external ADC converter or a different sensor variant.
Q: Is the pin header included in the package?
A: Yes, the package includes one MQ-135 module and a strip of 3-pin headers which you can solder onto the board yourself.
Q: How long does the preheat time really need to be?
A: For stable and accurate readings, we recommend a preheat time of 24 to 48 hours. Shorter periods may result in fluctuating baseline values.
F01RB0WA23 Transmission Valve for Roewe DQCT280 Remanufactured
$324.00
Full Payment Pre-order Guzi Bear DMMD Dramatical Murder Badge Polaroid Set Merchandise
$29.00
Peach Wood Sheepskin Rattle and Clapper Brass Traditional Handmade Baby Teething Hand Drum Newborn Gift Box
$29.90
Pirelli Run-Flat Tires 235/245/255/265/275/285 40 45 50 55R19R20R21
$350.00
Protective Case Lid for Pelican Cases - Laptop Insert for Models 1510, 1560, and 1535
$254.00
Universal 5800 Super Glue for Plastic, Metal, Glass, and Wood, 10-Second Fast Curing
$2.01
White Noise Wood Chip Core Grid Scented Candle Wooden Core S-Type Brand Name Candle Container Soy Candle Core Wood
$1.50
Zunjue 100% Cotton Paper Block 300g Watercolor Paper, Fine/Medium Grain, Thickened 80 Sheets, Neutral Acid-Free Journal Paper for Art Students, Beginners, Watercolor, Colored Pencil, Pen, Light Wash, Marker
$27.20
Outdoor Waterproof Dry Bag for Rafting and Creek Walking - Large Capacity Backpack for Swimming, Hiking, Diving, and Flood Rescue
$132.00
Lukang 995 Door and Window Fast-Drying Glass Sealant - Transparent Weather-Resistant Neutral Silicone Structural Adhesive
$222.90
Large Flip-Type Water Draining and Air Drying Machine, Fully Automatic Air Knife Blower for Vegetables, Commercial Continuous Drying Equipment
$15,282.00
Large Capacity Household Quilt Storage Bag - Waterproof and Moisture-Proof Duvet Organizer for Moving, Packing, and Luggage Sorting
$5.88
Scented Candle Aluminum Alloy Turntable 360-Degree Rotating Double-Sided Silent Non-Slip Small Turntable for Cake Decorating and DIY
$30.40
Ceramic Five Oxen Painting Brush Washer – Antique-Style Ink Well for Calligraphy & Traditional Painting
$16.90
Liupintang 3-in-1 Brush Washing Bucket with Palette - Portable Handheld Multi-Function Art Tool for Chinese Painting, Watercolor, and Gouache, Foldable Small Pail
$17.80
ZGT Type Damped Spring Vibration Isolator for Large Equipment such as Chillers and Diesel Generator Sets
$135.00
Shanlian Lake Brush Wool Felt Mat for Calligraphy and Painting, Washable Desk Pad for Beginners
$22.70
New Silicone Data Cable Protector, Anti-Break and Anti-Bite Cord Organizer for Charging Lines and Headphones, Universal Phone Accessory
$5.58
Cafeteria Bulb Vegetable Cutter - Complete Kelp Shredding Production Line, All-in-One Slicing, Dicing, and Shredding Machine
$10,000.00
Electric Water Dispenser Pump for Bottled Mineral Water - Automatic Press-Type Purified Water Pump Manufacturer
$113.00
Heavy-Duty Industrial Wiping Cloths for Auto Painting, Baking, Film Application, Detailing, and Degreasing – Absorbent, Oil-Removing, Lint-Free Paper and Cloth
$120.00
6-Cavity Oval Beehive Silicone Mold for DIY Handmade Soap - Heat-Resistant Non-Stick Large Mold for Milk and Essential Oil Soaps
$4.93
Data Cable Organizer Bag with Zipper for Charging Cables and Adapters - Dustproof Desktop Storage
$5.90
Auby Baby Rattle Toy for 6+ Months, Chewable Wave Drum and Shaker for Newborns and Toddlers
$24.90
Preferred 45L Industrial Pulping Machine Spinach Fresh Pulp Galangal Carrot Tomato Sauce Making Fruit and Vegetable Industry Blender
$7,632.00
KAD Professional Thickened Sketch Blending Stump - Dual-Head Smudging Pen for Art Students
$9.90
Beijing Imported Dental Implant Package - Appointment Booking, X-Ray, and Treatment Plan Included
$1.00
![Huahu [Top Layer Cowhide] Japanese-Style Men's Genuine Leather Belt, Simple Casual Business Wide Belt with Automatic Buckle](https://www.gosteppe.com/cache/small/product/269537/legacy-main-e3e965ff85d9032ca79f72b8.webp)
Huahu [Top Layer Cowhide] Japanese-Style Men's Genuine Leather Belt, Simple Casual Business Wide Belt with Automatic Buckle
$423.00
Wall-Mounted Towel Storage Box Large Capacity for Bathroom
$8.42
Loctite 480/411/403/407/406/414/420/401/415 Heat-Resistant 495 High-Temp 417/416 Instant Adhesive
$26.80
![[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)
