Our first experiment was to hook up a liquid flow meter to a Raspberry Pi and have the keg tweet every time someone drinks from it! Follow @AdafruitKegBot for updates.
For now the keg has birch beer, but we’ll be getting a beer beer kegerator soon and will mod that one up as well! Post your feature suggestions in the comments.
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Have you found the beer to be foamy since installing these flow sensors? We had good luck with swissflow flow sensors but these types of sensors introduced lots of foam.