Getting useful noise data...

Products & Technology Grove
#1

I am trying to log environmental noise, but the values I am getting from the loudness sensor and the noise sensor aren’t that useful. I have had the sensors set up in my living room for a few days.

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  • During the night when the room is very quiet, I am getting average (300 over 5 minutes) readings of the sensors between 391 and 392.
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  • During the day when things are noisier, I get readings between 391.5 and 393.
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  • In the evening with the TV blaring, I get readings from 394 to 397.
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    Although I can tell from the graph when things are, I need to write some code to trigger warning when things get too loud, and I simply do not feel like I get enough signal to noise ratio here to do that.

    I am essentially using the code from the loudness sensor wiki page in python on a raspberry pi, grove base pi hat.
    #2

    Hi there,


    1. please make sure your physical analog port match with the code analog port.
    2. you can adjust the blue item to adjust the sensitivity. thanks.
    #3

    OK, so I think I’m going about this all wrong. Here is a more illuminating graph:







    I think the sensor doesn’t return any sort of aggregate data, but returns the value from the mic at a given point. I think to get useful loudness data, I need to take a whole bunch of samples over a short period, and consider my loudness to be the difference between the lowest and the highest.



    Is that about right?