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I use a Raspberry Pi in combination with a temperature probe to measure the temperature of my wort. It would be nice if I had another probe that could measure the current gravity of my beer, so that my RPi could instruct my fermwraps to heat up once primary fermentation is complete.

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Yes. There is the beerbug, a wifi/bluetooth SG sensor.

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beerbug has an API in the works to allow access for applications like this. – jalynn2 Mar 31 '14 at 17:15
Any idea on how it works? – Matthew Moisen Mar 31 '14 at 18:20
It appears to be driven by weight/gravity: The BeerBug sits on top of your fermenter in the bung/stopper, and a weight hangs from it through the stopper and submerged in the wort/beer, attached by fishing line. I'm assuming it monitors the amount of pull the suspended weight is exerting on the controller, which increases as the gravity of the wort/beer decreases. You have to tare it by giving it your initial gravity, taken with a standard hydromoter or refractometer. – jalynn2 Apr 1 '14 at 18:59
I should add that I have not actually used mine yet -- I just received it a few weeks ago, and have not had a chance to brew since. – jalynn2 Apr 1 '14 at 19:09

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