Digital Pressure Gauge for Keg

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More info to come.


Monitor and adjust CO2 pressure on a keg, for carbonation and serving.


Corny keg gas quick-disconnect (1/4" male flare) -> 1/4" female flare nut -> short 1/4" aluminum tubing, flared -> 1/4" compression-to-FPT adapter -> 1/4" MPT w/ Schrader (tire) valve

The FPT side of the compression adapter was drilled from the side to accept the nozzle of a piezo pressure sensor (see [Circuit] below). Pressure sensor was JB-Welded in place.


  • Input: PRESSURE TRANSDUCER TDR-120 from ($1/ea, surplus; no longer available)
  • Logic: Will use AVR to read analog voltage/resistance from sensor.
  • Output: Segment display? LCD? Web-enable? Bluetooth?