Measuring gas concentration with an MQ sensor in MySensors setup?

[Aria James]

Hi everyone! I’m putting together a MySensors node and want to measure gas levels (like smoke or CO) using an MQ-series gas sensor, then send that data over MySensors radio to my controller. I found this tutorial explaining the MQ Gas Sensor series (MQ-2, MQ-3, etc.), covering their working principles and interfacing with microcontrollers:
https://www.theengineeringprojects.com/2024/04/mq-gas-sensor-series.html
I also checked example sketches on GitHub for MQ sensors with ESP modules, and read a blog post comparing different gas sensors in home air quality projects. Has anyone integrated an MQ sensor into a MySensors network? What resistor, calibration, or data smoothing tips worked best for you?

[epierre]

as I experienced, MQ sensors are not really gaz sensitive, they are more particle size sensitive when hot enough and when not totally scrap.

I would not rely my life on them, if you have an alcool spray use it around and any MQ will to go the sky...