(The current photos are of the original project. I will replace those when new photos are available.)
Water waves are the variation of water level over time. The waves in a pond are a good example. If you experiment with throwing rocks into the water you can see the waves spread out and dissipate. There are more than just one up and down motion of the surface, maybe anywhere from 5 to 10. The water waves appear to be generally in the frequency range of around 1 Hz, plus or minus.
What would happen if you record the water height as a function of time, and then speed it up by a factor of around 100. That would raise the frequency to around 100 Hz, which is in the range of human hearing. What would it sound like?
Would waves formed by throwing something into a swimming pool, when sped up, sound like clapping your hands in an empty room? Or what?
I tried a little experiment a while ago and got this sound: https://cdn.hackaday.io/files/19229822693536/file1024_Kathy_s_pool_300x.mp3 - it shows promise, but it does not sound very good at all!
So, in this new version, I'd like to substantially improve the sound quality.
Basically it's a data recorder that can record water height at rather slow rates (around 1 Hz). I can't use a digital audio recorder directly for this, since the frequency is way too slow. What is required is some kind of transformation of slowly changing height measurements into an audio signal. Some software can transform the audio signal back into the sequence of height measurements, and then that sequence can be sped up by a factor of about 100 to create a new audio file representing the water waves.
The long term goal is to build two detectors to create a stereo audio waveform.