If CO2 is to high set fan on

[jonathan12]

Hi all,

I'm trying to turn on the house ventilation (mechanische ventilatie) when the CO2 is too high using a Sonoff wifi swich like this topic: https://www.domoticz.com/forum/viewtopic.php?t=12544

I have a working MHZ19 sensor on a NodeMCU. It is working in Domoticz.
I have a Sonoff wich I will connect to my ventilator (DUCO). For now I have connected a lamp on it. The switch in domoticz is working.

I created this blockly script:



Why is it not working when I blow into the CO2 sensor and make the CO2 higher then 800ppm?

[jonathan12]

Fixed it with another type of if do:



And this is also working: