For those that haven't seen it already.
Keg --> in line flow sensor --> (kegbot) --> Android device
Keep track of beer left per keg if you use multiple sensors. There is an opensource project to do it yourself and add things like NFC tags to log who's drinking and solenoids to prevent pours without the correct NFC. They're kickstarting just the base functionality.
https://www.kickstarter.com/projects/12 ... -kegerator
Kegbot Kickstarter
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