Is it possible to register vibrations from the phone?

Question

Arduino

I wonder how real it is and what can be registered?

In the phone settings there is a type of vibration when calling, there are 5 types (Basic, Heartbeat, Waltz, ...). I want to register vibrations to "guess" the type. Attached to the phone Loudity LD-BZPN-2312, but it seems the vibrations from the phone are too weak, it registers only the beginning and sometimes something in the middle. I would like to get at least something similar to the listed vibrations. What do you advise?

PS: I want to check the SW-420

Answer 1

You want to record infrasound with frequencies of tens of hertz, and you are trying to use a piezocrystal with a resonance of 4 kHz for this. Piezo are completely unsuitable sensors for infrasound, their operating frequencies are upper sound and ultrasound.
It is unlikely that sensors based on the electrodynamic principle will be better (this is understandable at least from the fact that the problem of bass reproduction in a mobile phone has not been solved so far). But you can still try to use them if you fix such a sensor on a massive fixed base, and run a rigid sound guide from its moving part to the place on your phone where the vibration is felt best.
Perhaps the best vibration sensor would be the standard body position sensor found in every modern smartphone. But this is just my guess.