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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.

  2. #22
    It has gotten up to 109 F here, very hot indeed! However my test house is holding up well. There are no signs of warping and there is only a slight discoloration on the plastic.



    I did notice that at the hottest time of the day the metal pole is heating up hotter than ambient temperature and radiating heat into the house. I suspect painting the pole white would help. On the flip side in a cold environment painting the pole black probably helps get heat into the house, even on a wooden rocket box. I did not measure this but it was quite warm to the touch, I estimate it was 8 degrees hotter than ambient.



    I have my temp sensors all set up, and I made a mount for my test houses. I just need to put the whole thing up and let it run. One problem is that we are only days away from the monsoons kicking in so we now have heavy cloud cover and should be seeing quite a bit or rain for the next few weeks. I really should have put this all up two weeks ago to catch the high point of summer heat...

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