For this I would specify a minim on time for the output in the pid controler so that the problem cannot arise in the first place would be my solution now
Might it be easier to âhackâ the physical switch on your dehumidifier so that it is in an âalways onâ state? That way Mycodo only needs to control the relay for the outlet your device is plugged into.
This is why I try to avoid appliances with âsoft switchesâ⌠you canât turn them on just by switching on the outlet they are plugged into, and when you turn them off (or they lose power), they âforgetâ that they were turned on.
Like Kyle said, without some kind of closed-loop monitoring of the on/off state of the device, youâll never be sure if the device is running or not.
Seems like it might be easier to hack the physical switch/electronics in the device than figuring out a custom coding solution.
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I have chosen a deshumidifier with a physical switch in order not to get this problem 
Iâve been using the method for years now, but somethimes i have problem because my relay is âstickingâ and deshumidifier doesnât stop. I found a way to avoid that but i was thinking maybe âupgradeâ my set up with a ârealâ PID/PWM control of the peltier plates.
I think this will give a much constant moisture and could be better for the hardware
I plan to modifie the deshumidifier to get the âcooling fanâ always on, and directly control the peltier with PWM by the use of a cheap âBrushed RC ESCâ.
What do you think about that?
Thanks
Hello and first of all thank you for looking at my problem.
Modifying the hardware so that my dehumidifier is always on would work, but my problem with that is that the automatic switch-off function when overheating and when the water tank is full no longer works.
The thing with the Peltier Plates sounds interesting at first, but itâs also a lot of tinkering and here I would be careful with things like cheap RC ESC and stuff like that because itâs supposed to run 24 hours a day, 365 days a year.
First of all I can deal with the custom code that is already here and otherwise I now have a reason to deal with programming
Mine is wrking since years now and, of course i also need to keep it working 24/7 correctly.
Iâm not scared about RC ESC quality, peltier module is not really big, it should not get too hot.
About the water level sensor, on mine itâs just a simple switch (and i saw another one where it is just plate in water). I was thinging of using it between the ESC and the peltier, so when water is full, it cut the peltier power.
For the overheating, iâm not sure mine got one.