Uncertainty

In my race out the door this morning, I can’t be sure if I heard bubbling or not. I’ll assume that everything is working until price otherwise. For my next fermentation attempt, I definitely want to add remote data logging. Speaking of that…
The follow up to LightBeer is popping through my head. It’s not like I need more projects, more that more projects need me. At least that’s what I tell myself. This follow up, which is a direct follow up to LightBeer is half experiment and half function. I have a lot of empty beer bottles now, with quite die variation in size and shape. This tells me that they should each have there own (harmonic frequency? That magic frequency where they perfectly vibrate producing a note). So… I harvest some greeting card piezo elements, strap them to the bottom of bottles. Tune them all and make music.
Now if I automate the tuning, the system for doing that I believe would also work for determining the frequency associated with a given density of a liquid. Ie. I could automate a substitute measurement for specific gravity when fermenting.
It’s like a circle of life of something.