Baby's first infrasound.
My DIY #Infrasound experiment just produced a strong spectral feature at 3.95 Hz using a Sensirion SDP810 differential-pressure sensor + #ESP32.
Did I detect a nearby train? A resonance/artifact from my 15' tube? Something else?
I don't know yet -- which means it's time for more experiments.
https://salemdata.net/johnpress/?p=1268
#DIY #CitizenScience #Acoustics #Sensors #OpenHardware #DataCenters