Bottle-o-meter

As widely known, one can generate tones by blowing over the top of any common bottle. Furthermore these tones change when the content of the bottle changes: The less content in a bottle the deeper the tone. This app records these tones and converts them to a fill level display using the so called Helmholtz Resonance Theory, which is valid for most bottles.

Currently there are two possible mathematical model variants to choose from:

- Theoretical model: This model is based on the shape parameters of the bottle - the inner neck diameter, the neck length and the bottle volume. These parameters must be specified prior to the measurement.
- Experimental model: This model is based on the base frequency of the bottle - i.e. the frequency of the empty bottle. The base frequency can conveniently be provided to the app in hertz or through a sound sample (you'll need an empty exemplary bottle).

Note that the results of this app only approximate the real fill level. Don't expect milliliter-precise results!

If you encounter detection problems please review the microphone sensitivity option in the settings and/or write a problem report to [email protected] if the problem persists.