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A comment on Life next to 199 data centres. Parent comment

Re:Life next to 199 data centres by NoiseBert69 on Monday October 27, 2025 @01:54PM (#45724196)
I live close to a hospital and they make a generator test run once a month. That's an ultra deep sinus (~30Hz) that's humming along - you can hear it everywhere within the city.

It's was super easy to measure using a Sensirion Differential Pressure sensor. They have a few extremely sensitive models that have a 100Hz sampling rate (50Hz useable after Nyquist) - also: you can sense washing machines (from vibrating buildings) with it 2 blocks away.

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Re:Life next to 199 data centres by bigwheels on Monday October 27, 2025 @06:32PM (#45727109)
What is the sensor attached to? And how can you pinpoint the source direction of sounds with it?

The product listing says something about a manifold, it looks like a raw component with 4 pins or so.

https://sensirion.com/products/catalog/SDP510

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Re:Life next to 199 data centres by NoiseBert69 on Tuesday October 28, 2025 @02:29PM (#45736832)
Sensirion SDP600-25Pa

SDP600-25Pa --- I2C ---> ESP32 --- UDP over Wifi --> Linux Host with simple Python recording script

Very rough pin-pointing is possible: plastic kitchen funnel which is attached to the sensor using a short hose.

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