I would like to make get some background noise measurements so I plugged in again my SCK 2.1. After turning it on all the sensors seemed to work OK except for noise sensor that showed constant 99 dBA.
After plugging and un plugging around ( tests with and without battery plugged, charged battery vs uncharged ) the sensor started to show something different, around 70 dBA. But at some point climbed again to 99 dBA.
Then i’ve updated the FW to the current version on git, the SAM 0.9.6. There the behaviour is the same with the lectures falling abruplty several minutes after the SCK restart from 99dBA to around 70 dBA. Now the noise showed is steadily drecreasing ( in one hour it went from 74 dBA to 68 dBA ) but being at night and inside a house these measures are nonsense and not related with previous measured done on the exterior that show a maximum of 68 dBA at noon on the exterior, and a minimum of 53 dBA on the exterior.
You can see the screenshots with the strange behaviour.
I’ll will cite @oscgonfer as It seems an specialist on this subject.