I tried to play a bit with this library but the readings I got from it made no sense... I'll use it as a general "air quality" sensor... One more question I'd like to know the answer to - say I'd like to connect a DHT22 temp\humidity sensor on the same D1 mini The MQ135 connects to A0, 3v3...

I saw there is an unofficial for the MQ135 but I'm not sure how to add it in order to test it
https://diyprojects.io/esp-easy-develop ... kjDrN-WY2w

Thanks for that,

Would be glad if anyone else familiar with the sensor could help with getting the rzero and where should I put it in the ESPEasy formula

Thanks for your reply

I was wondering about your comment, given that you suggested in your example to use 4.7K & 1K Ohm resistors :
This would be for a source which voltage range is 5.7V ? do you have any knowledge of the MQ-135 Analog output voltage range ?

Thanks

Hi there, I'm new to ESPEasy and so I've tried to use MQ135 to detect CO2 levels around the house I've connected the sensor to the 3v3 output from the D1 mini, although I see that the spec define 5v as the recommended voltage I managed to get a reading but it's not so stable so I have a few question...