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  1. #21
    I got my sensors all wired up. Well all but one, I managed to pop one of the digital temp sensors. I will need to order another one. Anyway I ran a test overnight with the sensors in a closed container and logged out the temperatures from all 7 digital sensors and the 4 analog sensors that I can hook up at the same time. Here is the raw temperature readout.



    I then analyzed the data and calculated a new scale and offset that would bring all the sensors into a closer line with the first digital sensor. Here is the corrected data.



    And finally I worked out the difference between the reference sensor and the rest. The analog sensors lag behind the digital ones, probably because of larger thermal mass. That is why the error grows so large during times of fast change (sunrise). When the temperature is stable the error is within 0.2 degrees C. It is even smaller for the digital sensors, I may leave the analog sensors off or use them where direct comparison is not important.

    Last edited by reality_boy; 07-07-2019 at 10:39 PM.

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