MS1100 Gas Sensor, VOCs Sensor for Air Quality, Carbon Dioxide

That being said, it just produces an analog voltage signal based on it's readings. There's also the option to set a trigger event onboard if values exceed a certain level. I found it to be completely non-responsive to a direct blast from a Co2 canister. That isn't scientific fact, it's just my experience. I wanted to build an AC leak detector based on Co2. I will be moving up to the next level which is an SPI device. I expect it will make far more data available to my micro controller. I'd definitely be willing to select this module for an application without a micro controller. I don't know if I'd trust it for a safety response system. But I'm also not saying you can't. I haven't tested it in the fire/smoke detection range. It goes crazy from electronic cigarette vapor. It will also respond very slightly to a direct slow exhale of breath. Just be sure that this module will suit your needs. I require a more complex form of multi-molecular analysis which this simply isn't intended for.

Worked perfect for my electrical engineering class, instrumentation and measuements.

This sensor works well for what it does, this gas sensor active over 2 yrs, paired with mq9 gas sensor and pm2.5 particle sensor and covers wide range of gasses, have it working with esp32.

Works, makes correct measurements. In the video l opened the door outside and you can see how CO2 level drops every second. Used Lingo microcontroller and manual with it with some internet help