Possible mistake in the code of the exemple DustSensorDSM



  • The code shows that the concentration can be calculated by the expression:
    long concentration = 1.1pow(ratio,3)-3.8pow(ratio,2)+520ratio+0.62; // using spec sheet curve
    But the sheet curve, as we can see in the graph, we have the concentration in the x axis, not in y as in the code:
    ratio= 1.1
    pow(ratio,3)-3.8pow(ratio,2)+520ratio+0.62
    I didn't understand why, in every code i see of this sensor, is the same. Can someone explain?
    If it is a dumb question, sorry, but help me please.
    The graph of data sheet.
    ![0_1607407293081_1da48a38-62da-4af6-a352-a1cbd79b2201-image.png](Uploading 100%)
    @epierre



  • Corrections of the post:
    ratio= 1.1pow(concentrarion,3)-3.8pow(conccentration,2)+520*concentration+0.62
    the graph
    123.jpg


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