Sound Level Graph?

[NateEaton]

Stas,

First off, great solution. It was straightforward to throw an ESP32 and an INMP441 on a breadboard, run ESPHOME to install the advanced config and having a sound meter up and running in no time. Comparing results against a sound meter on my phone, the results are pretty close (4-5dB higher than my phone in a quiet room but peaks for loud noises are almost the same).

I haven't gotten into lower level details, yet, messing around with filters. In the meantime, one favor? I'm curious what you used to create the example Sound Level graph in the README? It's obviously not the standard Home Assistant history graph.

Thanks,
Nate

[stas-sl]

Hi!

Yes, I also noticed that in a quite room I get higher readings than I would expect. Here I described my experiments: ikostoski/esp32-i2s-slm#19. It can vary a bit (1-2 dB) depending on mic instance (I also used INMP441) and there could be other electromagnetic noises that can affect.

Considering the graph in README - I send data to my own database and use Grafana for visualization.

[pe0ter]

I have built a teensybat bat detector last week and I am amazed how much high frequency noise surrounds us in our houses. Power supplies, induction cookers, anything with a switched-mode power supply creates noise a mems microphone can hear and will display as noise level even though we do not hear it and regard a room as quiet.