Comment by minetest2048
4 years ago
I remember seeing a Hackaday post that uses FFT/spectogram to infer IoT things such as boiling kettle without cameras. Is this related?
4 years ago
I remember seeing a Hackaday post that uses FFT/spectogram to infer IoT things such as boiling kettle without cameras. Is this related?
No, it's not related. I'm trying to get notified when my noodle water has started boiling, but even with an humidity sensor in the kitchen it's pretty hard to tell when it's about to boil, so that the heat can be lowered before it splashes around. And the FFT in the kitchen is somewhat broken so I can't use it, there may be a lot of noise in the mains or something like that. In any case I've planned to replace the setup in the kitchen months ago, but never moved on to doing it.
The evidence I use to determine when water is about to boil is my ears. I hear a staccato creaky sound that accelerates just before water boils, that is very distinct and easily picked up by microphone. (Curiously, I've never seriously asked what makes this sound, physically.) How do rice cookers do it?