jbesedic
New Member
Posts: 15
Raspberry Pi: Yes
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Post by jbesedic on Jul 6, 2019 6:39:42 GMT -8
I have a Davis Instrument Vantage Pro 2 station right beside my Skyweather station and I noticed that the temperature reading is off by approximately 4 to 6 degrees. I do have it in a shield to protect it from direct sunlight. I'm also comparing other weather station around my area using Weather Underground and my Davis Instruments station is pretty accurate. I'm hoping that I can possibly change the calibration somehow via the software? Here is the radiation shield I am using that is sold by Amazon. amzn.to/2XqB638 |
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Post by pharmville on May 20, 2020 11:48:24 GMT -8
I just purchased a skyweather kit and built my waterproof box. It has been set up for only a few days, but I'm noticing the same issue. During the day the temp is 6 - 10 degrees higher than actual, even if the sensor cover itself is in the shade. At night the sensor is still about 2 degrees hotter than a known good sensor. I'm going to try relocating it to make sure the sensor has good airflow, is continually shaded, and is connected to it's own pole, instead of connected to the skyweather box. That way I know the circuit boards in the vicinity aren't driving the temp up. I'll post back in several days with my findings, but I may want to try a different brand of sensor if that doesn't fix things. Otherwise the kit is great.
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Post by SDL on May 24, 2020 8:32:56 GMT -8
Yes, you probably have a thermal load on the sensor. Do you have an AM2315 or an SHT30 sensor?
BP
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Post by relix42 on May 31, 2020 16:47:35 GMT -8
I'm having a similar issue with the AM2315 in a recently purchased SkyWeather system. Box and wiring are built according to the v1.7 instructions. The testAM2315 python file included returns that same high temperatures. I've tried relocating the box, shading the sensor, and running the sensor outside the shroud to make sure the shroud wasn't holding heat.
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Post by SDL on Jun 1, 2020 10:19:54 GMT -8
At night is it recording high temperatures? say well after sunset. If it isn't reporting high temperatures, then it is your heat loading that is affecting the AM2315. You can try a Stevenson housing. You can find them to 3D print, but here is an inexpensive one that we use in Project Curacao3 down in the Caribbean. amzn.to/3gKTcTlBP |
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Post by pharmville on Jun 21, 2020 21:34:28 GMT -8
As for myself, I am using the AM2315 (which came with the skyweather kit I purchased). I moved that sensor away from the skyweather enclosure and placed it inside this: (click to see amazon product)
The enclosure is about 5 feet off the ground attached to one grate on an iron grate fence. No change whatsoever. Still 1 or 2 degrees C higher than expected, even a few hours after dark. So I decided to order an SHT30 from this site, in order to compare the 2. I'll give an update once it arrives.
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Post by SDL on Jun 23, 2020 5:47:03 GMT -8
pharmville,
Looking forward to the data. It's these kinds of problems with the AM2315 (and others you have not run into) that has convinced us to move to the SHT30 for I2C sensors.
BP
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Post by Jason on Jul 6, 2020 7:47:30 GMT -8
I'm so glad I found this thread. My AM2315 drops out after several days of continuous operation and will no longer power cycle. It just spits out "Remote I/O Error" messages. Has the SHT30 been tested enough that you would recommend it as a drop in replacement for the AM2315 probe? Or would I be venturing to the bleeding edge should I try to do so?
Thanks,
Jason
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Post by pharmville on Jul 6, 2020 16:35:31 GMT -8
I want to quickly report back on the SHT30 - Swapping out the AM2315 for the SHT30 has fixed the issue I had regarding accuracy. The SHT30 seems to report correct temperatures, and it has been doing fine for over a week now.
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Post by Jason on Jul 7, 2020 4:57:27 GMT -8
I want to quickly report back on the SHT30 - Swapping out the AM2315 for the SHT30 has fixed the issue I had regarding accuracy. The SHT30 seems to report correct temperatures, and it has been doing fine for over a week now. Are you power cycling the Raspberry Pi on a regular schedule? Thanks, Jason |
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Post by pharmville on Jul 12, 2020 13:04:29 GMT -8
Yes, I never changed the default, which is to power cycle every 5 days, if I remember correctly.
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Post by Jason on Jul 15, 2020 5:59:32 GMT -8
Thanks for the response! I don't power cycle my station at all so I'm curious to see if the SHT30 is more dependable over time than the AM2315.
Thanks,
Jason
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