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Description
MQ 135 Air Quality Sensor Module – Hazardous Gas Detection for Arduino by ADIYDESCRIPTION This Module makes use of the MQ135 air quality detector and hazardous gas detector chip. Other circuit components such as the LM393 analog comparator chip on this module makes it easy to integrate this module into a project that can detect hazardous gases. The Module requires a 5V power supply and provides a digital Logic output (1 or 0) and an analog level output (0 4V). The digital logic output is LOW (0) when no gas is detected but goes
DESCRIPTION
This Module makes use of the MQ135 air quality detector and hazardous gas detector chip. Other circuit components such as the LM393 analog comparator chip on this module makes it easy to integrate this module into a project that can detect hazardous gases. The Module requires a 5V power supply and provides a digital Logic output (1 or 0) and an analog level output (0-4V). The digital logic output is LOW (0) when no gas is detected but goes HIGH (1) when hazardous gas concentration in the environment reaches the set threshold set via a potentiometer on the module. The analog level output provides an output voltage within the range of 0 to 4V based on the concentration of the hazardous gas in the environment; 0V for lowest concentration, 4V for maximum concentration. You can use it detects hazardous gases such as Ammonia, Nitrogen Oxide, Alcohol, Benzene, Smoke (Carbon Monoxide), Carbon Dioxide and other air contaminants in your DIY project.
The MQ-135 device on this module uses a heating element. After initial power ON, Please wait at least 20 Seconds before reading outputs to ensure data validity.
Datasheet
FEATURES
High Sensitivity
Stable and Long Life
Detection Range: 10 - 300 ppm NH3, 10 - 1000 ppm Benzene, 10 - 300 Alcohol
Heater Voltage: 5.0V
Dimensions: 18mm Diameter, 17mm High excluding pins, Pins - 6mm High
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4.1 ★★★★★
Based on 1770 reviews
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Product Reviews
★★★★★ 3
good toys but better for gentle / non aggressive teethers
Color: Blue
cute but not very durable. better for dogs who are not aggressive chewers even though they are young pups.
when they are broken apart by teeth, the pieces are at least clean cuts. no big concerns of ingestion
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Reviewed in the United States on June 7, 2026
★★★★★ 5
Cute set for my 2-1/2 pound chihuahua puppy, and this set would also make a great gift
Color: Pink, Color: Pink
First off, I like how each piece is individually wrapped and then placed all together in a plastic bag. While it's not in a gift box, I feel like this would still make a really cute gift (that shows up in good shape, too.)
For the current price of under ten bucks, this feels like a really great value for five cute toys.
My chihuahua puppy is only 2-1/2 pounds, so some of these are a bit larger for her, but that's to be expected at her tiny size, and it doesn't stop her from enjoying them.
These feel really sturdy to me for smaller dogs to chew on. I personally love the added "ribbons" because I think they're adorable and because my dog loves things like that. They really get her to engage with toys even more. while also giving me another way to interact with them more as I play with her.
I could see how those fabric pieces may wear down over time for a larger dog, but I think it depends on how much a dog focuses on chewing on those pieces. Fortunately, the plastic toys will still be cute without those fabric pieces if anything happens to them.
Unfortunately, the plastic pieces have a very slight odor. I'm super sensitive to smells, so you may not notice it at all. It's certainly not as bad as so many other plastic items, and it came right off when I washed it in dish soap (which I would do before giving these to my pup anyways.)
I hope your small dog enjoys these as much as we do, and I hope you find this review helpful!
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Reviewed in the United States on May 27, 2026
★★★★★ 4
My dog wasn’t interested in these
Color: Pink
I have a 10 pound adult Maltese/Yorkie mix and she was not interested in these toys at all. They are solid construction and very firm. They have lots of bumps, humps and ridges that would likely feel good to a teething puppy. They look great but I’m not sure why they put ribbons on some of them. The ribbons would be quickly shredded with a game of tug-o-war with my dog. I deducted one point for usefulness.
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Reviewed in the United States on June 7, 2026
★★★★★ 5
good
Color: Yellow - Fried Chicken Leg, Color: Yellow - Fried Chicken Leg
My dog is obsessed with this toy. He carries it around everywhere and plays with it every day. Good quality, cute design, and great value. Would buy again!
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Reviewed in the United States on June 9, 2026
★★★★★ 5
doggy toy chicken leg
Color: Yellow - Fried Chicken Leg
I bought this chicken leg toy for my dog and it quickly became one of his favorites. The yellow top part has two different sections — the very top makes a crinkly sound like paper when he bites it, and the middle squeaks when he chews or presses on it, which really keeps him interested. The white bottom part is super soft and easy for me to hold, so it’s great for playing tug or just interacting with him. The size is perfect for small dogs, but it might feel a bit small for larger breeds — that said, the material quality is really nice. Overall, it feels well made, fun, and keeps my dog entertained without getting bored. Definitely a good buy.
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Reviewed in the United States on January 4, 2026