My fermenter sitting in BrewPi Published September 29, 2012 at 2736 × 3648 in BrewPi released! All source code online, a wiki, a forum, a bug tracker.. Let’s go! My fermenter inside BrewPi for a test with water. The DS18B20 sensors are watertight and connected with DIN plugs. I still have to make the sensor hole air-tight before starting a real brew.