> A fascinating fact is that the oscillation frequency is rather stable at ~9.9Hz as it mainly depends on gravity and diameter of the flame.
This reminds me of when I first heard about Dolbear's law by which you can get an approximate measurement of the air temperature using the number of chirps per minute from a cricket.
Maybe you could also use the spinning fan from the computer that makes all these calculations, as another frequency reference. Although I'd want that particular calculation to be done in constant time, to avoid potential instability or hunting oscillation.
> A fascinating fact is that the oscillation frequency is rather stable at ~9.9Hz as it mainly depends on gravity and diameter of the flame.
This reminds me of when I first heard about Dolbear's law by which you can get an approximate measurement of the air temperature using the number of chirps per minute from a cricket.
https://en.wikipedia.org/wiki/Dolbear%27s_law