How do I properly do it?

[alphatech]

Hi,
I have a temperature sensor attached to the hot water on the shower. I would like to turn the bathroom fan on when the temperature is reaching 75F (see graph). So far it works but it missfires two times, when the temperature goes up to 75F and then goes down to 75 again. I would like to turn the fan on only once.

Thanks for your input,
Aldo

[Michael McSharry]

For the data that you show on your graph when do you want the fan to run?

[alphatech]

Around 75

[Michael McSharry]

Your graph shows 3 peaks above 75. Do you want exactly 3 ON cycles of the fan. When do you want the fan turned OFF?

[alphatech]

Hi Michael,
3 peaks indicate three showers, at each peak going up I would like the bathroom fan to go on. So in theory I would like the bathroom fan to go on at above 75F but not when it goes down after cooling down. I have another script that turns off the fan after 10 minutes of activity.

Thanks,
Aldo

[Michael McSharry]

The simple trigger of increases to 75 and persists for 0 should do what you want. Exclude the rate and the retrigger aspects of the trigger.

[alphatech]

Thanks Michael. Looking forward to use your sprinkler app. Installing it as we speak.