Digital Pressure Gauge for Keg

More info to come.

Goal

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

Plumbing

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.

Circuit

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