UberFridge, the first results are in!
It has been a while since I have published UberFridge and this update is long overdue. Now I’d like to finally share the first results with you and you can download my paper on UberFridge for a more scientific and condensed write-up of this project. I have brewed two beers so far: Hoppy Hefe: 3kg Wheat Dry Extract (8,0 EBC) 30,00 gm Hallertauer Perle [6,90%] (30 min) Hops 14,2 IBU 30,00 gm Hallertauer Perle [6,90%] (15 min) Hops 9,2 IBU 120,00 gm Hallertauer Hersbrucker [2,90%] (Dry Hop 5 days) 1 Pkgs Weihenstephan Weizen (Wyeast Labs #3068) [Starter 1500 ml] Hoppy Hefe fermented around...
Read MoreUberFridge hardware and schematics
I have grouped all the circuits used in my UberFridge project in this article. Schematics, a board layout and pictures. A top view of the electronics in UberFridge. My fridge has an on/off button on the top, which made it very easy to reroute it via a relay. The boards at the bottom were already in the fridge. I have encased most of the electronics for UberFridge in a small casing made from an Ikea box lid, see this article. The sensor wires go through the top of the fridge to the light bulb housing in the fridge. The relays are on a separate board. All other electronics are in a plywood...
Read MoreControlling fridge and beer temperature with a predictive on/off algorithm and PID
UberFridge is capable of controlling the temperature of a fermenting beer with 0.1° C accuracy. It can also be set to keep the fridge temperature within a -0.5 to +0.5 °C range. How this is done in an energy efficient manner is explained in this article. Controlling the fridge temperature To control the fridge temperature, I use a predictive on/off algorithm. Why do I need a predictive algorithm? Because waiting on measurements doesn’t work. On/Off actuators The temperature in the fridge cbe lowered by turning on the compressor. To increase the temperature, I just turn on the light in...
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