Hi @Siddharth-Velappan The warmup time of the MH Z19b is 3 minutes. So 2 is probably fine, but you could probably do 3 just in case. Although 2 would save your more battery time. Do you mind explaining your setup a bit more? I would love to do something similar but I do not know where to get started with the PIC microcontroller!

Hi, General description is available on english version. Sorry for bad translate.

@Samuel235 I am looking at a CO sensor too, do you have any updates on the ones you are using? What is the exact model?