Reddit reviews Luvay 12Pcs Piezo Pickup Transducer Prewired - 27mm Contact Microphone Trigger - Discs Elements for Acoustic Instrument: Guitar, Drum, CBG etc. with Leads
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Plate material: BrassGreat for: Acoustic Instrument Pickups, Stomp Boxes, Contact Mics, Etc...Resonant frequency: 4.6 +/- 0.5 KHzResonant impedance (ohms): 300 max
I gave up on the accelerometer and got these piezo disks instead. I then flashed ESP Easy on it and had it report the piezo voltage to Home Assistant over MQTT. However, I wasn't able to find a good threshold (walking or talking in the laundry room registers about the same as the dryer running) so I pretty much abandoned the project :(