"The BeerBugTM is a cloud connected digital hydrometer"
I already have a RaspberryPi that records the temperature of wort and stabilizes wort temperatures via a relay and a Fermwrap. The pain is that I have to take gravity readings, update my database, and manually turn up/down the heat based on the gravity.
I've put several hours into researching how to replicate this but have come up with nothing.
The only hint the company gives is the following:
The BeerBugTM's torpedo hangs down into your fermenting fluid and acts as a traditional hydrometer does. In short, this is a subject of the Archimedes principle - the force that is exerted on a body immersed in a fluid, is equal to the weight of the fluid that the body displaces.