Well, 2 Outputs for the LED indication of temperature, one ADC (you called it A2D).
I use LM335 because it's very very easy to use. Of course, I could also use a PTC (about half of the price or even lower, but accuracy?). and one pin for the heater switch. Yeah, I'll draw a schematic, and attach it to a message.
Maybe I'll add a PC-fan to distribute the air inside. (But adding things won't make it cheaper, unfortunately)
Thanks for the link!
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