Too stable noise measurements

Hi,

the data from my sensor esp8266-4578495 (Sensor ID:72805) are too stable - it’s basically always around 44±1 dB and the differences between night and day are minimal (https://api-rrd.madavi.de:3000/grafana/d/BYsfp-xGz/dnms?from=now-1d&to=now&var-chipID=esp8266-4578495&viewPanel=panel-2) … I don’t think this is correct and I remember couple years ago when I started with it, the measurements had higher variance

Can the microphone be “broken” after couple years? Is there any troubleshooting info - steps I can try to reset or “fix” the sensor?

BTW: where can I see graph with historical values for more than 24h?

Thanks!
Jan

Theere was a website of Helmut Bitter with more complex graphs but I can’t remember where…

https://laerm.citysensor.de/

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