impactoz
Full Member
Posts: 142
Raspberry Pi: Yes
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Post by impactoz on Nov 15, 2020 2:05:02 GMT -8
So I am still using an AM2315, had not really had the need to move to a SHT30... I can find a SHT31 locally too!
But my issue that has always plagued me - is that my temperature readings for external are quite often recording too high. It seems to occur when direct sunlight is hitting the cover over the AM2315. At night, mornings, my AM2315 is recording pretty close to other observations in the area...
In summer - when direct light is hitting the sensor - its heating up and showing 6 - 7C more than what it should be...
Real painful. I used the cover from the supplied 3d files, and printed it myself... But I notice now after some weathering, maybe the cover is a little translucent - its an off white / greenish tint to it.
I want a quick solution - and knowing white cars are cooler than black... do you thin just painting the cover white might resolve it ?
The AM2315 shield does touch the case - the mesh shield is a tight fit - and touches the case and the shield... maybe thats the issue...
I just gotta resolve this one! arghhh!
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texansooner
New Member
Posts: 15
Raspberry Pi: Yes
Other Device: Many
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Post by texansooner on Nov 15, 2020 18:02:01 GMT -8
Thin is better - think of the shield as having mass - and thermal inertia - if it is warm, then the sensor will be as well - airflow through the shield will translate to a better reading of the sensor, perhaps an 'umbrella' over the sensor to keep it from direct sunlight would help. Painting just adds more mass, which may skew or mute the sensor response - and even though it might be white, it may have infrared absorption properties - a bit of experimentation is in order. Mine is doing the same thing. IF it is not solar powered, you could use a small fan to pull (not push) air through the shielded area. (blowing into the shield will heat it slightly over ambient.)
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Post by SDL on Nov 17, 2020 12:52:42 GMT -8
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Post by Powderjockey on May 16, 2021 17:07:54 GMT -8
I have the opposite of this. It is currently 26 C and my outside temperature is showing 9 C.
currentOutsideTemperature = 9.0 currentOutsideHumidity = 50.8 currentInsideTemperature = 30.48 The inside is probably correct, as this is the inside temperature where the Pi is housed.
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Post by SDL on May 17, 2021 18:20:09 GMT -8
What do you have for your housing? Odd it is showing low. Does it always show low?
BP
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