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Noise-o-meter on a Raspberry Pi for all those open plan offices : r/raspberry_pi
Building a noise level dashboard for your office with a Raspberry Pi | by Yuri Veremeyenko | Homeday | Medium
Raspberry Pi 4 Model B/3B+/3B HIFI DAC Full HD Class D Amplifier Sound Card,X450 Audio Expansion Board Raspberry Pi Music Player|Demo Board| - AliExpress