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Another thing that maybe is obvious, if I decide to use the i2c LCD I have to switch to i2c mode the co2 sensor too and not maintaining it in uart mode right?

Yeah after a little bit of mind refreshing I remember how it works. I used i2c protocol for my old quadcopter FC (basically an arduous mega repacked) and his sensor. Thank you for the tips anyway :)

Casabonita can you share the actual code that you are running now? :) so I can start to study it to apply my modifications :)

Ok thank you for your tips. I will start to learn more about coding during this period of waiting for the components :)

Thank you for the update :) but I can connect the LCD via i2c and the co2 sensor at the same time? I'm at the very beginning with coding I'm better with soldering stuff :) Good idea :) for now I have to wait the components. Something like 30/40 day to receive it from China

HI casabonita420, first of all thank you for sharing your beautiful project to the community. And now...yesterday I ordered all the components that you used in your project, and some others sensor like soil moisture, and 8 relay board, Ethernet shield, rtc. I want to try to add some variables to...