Safety is number one priority, so:
IP 20 and appliance class III
Optocoppuler
Plugs
Plugs are very important, because pulling cable may cause bad touch on our board.
Few layers of stolen nail polish may not seem beautiful, but seems like making legit IP67... as long as you are not moving it. It cracks, and need a replacement for something more flexible. It was flexible for few days, but now it isn't. No hot glue is not a good idea. You may fail to cover metal correctly. You need to put few layers of some flexible glue. Looks like I need hardware store shopping, unless you let me know in the comments about better way.
To power all this I used the most primitive buck converter with diode bridge and multimeter says it's extremely linear. Looks like the very next step is to make a container temperature of which will be regulated.
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