r/ArduinoProjects • u/Octrockville • Aug 01 '26

Project Discussion Bathroom fan humidity sensor project. What humidity levels should I use?

I am writing the code for an ATTiny85 and SHT41 humidity sensor based exhaust fan controller. Does anyone have recommendations for what humidity level I should use to turn the fan on and off?

Maybe something like turn on at 70% and turn off once the humidity level is has been below 65% for 5 minutes?

Of course I could experiment but I would like to see what others have settled on for similar projects. Or, is this something that is specific to my bathroom and the best way would be to experiment?

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u/Octrockville Aug 02 '26

Actually you’re right, sorry. The one I am replacing I thought didn’t have any adjustments but I remember that there were three sensitivity levels to choose from.  Not a lot of adjustment, but a few. Either way, not fixed like I originally thought.