AirGradient Forum

Outdoor Temperature and humidity reading correction

Components
#61

Just chiming in that as of 3.1.13 with an Open Air, the temperature reading is still quite off. I’m not sure what the expected accuracy is supposed to be at the moment. The temperature is really -11C right now but it’s showing as -4C. Yesterday it was 0C and it was showing 8C. So still quite inaccurate.

When we developed the two formula we did not have much low temperature data.
Are you depending on local outdoor temperatures to collect data in order to adjust the algorithm? It seems like you should be using some small refrigerators and freezers in order to simulate colder temperatures, especially if you aren’t in an area of the world that gets such temperatures, like a lot of your users do.

#62

We are working on an update to bring the new custom calibration for temperature and humidity into the firmware so that it can be picked up by hone assistant. This will be in version 3.1.14 of the open source firmware.

1 Like
#63

My outdoor unit consistently shows a higher temperature than what the “weather app” shows. However, it is on a small balcony, mounted to the concrete wall that no doubt carries heat well into the night after the summer sun has set.

Short of having the temperature sensors out of the case, and out of the sensor packaging, in exactly the same conditions as each other being mindful of any slight breeze from a warmer or colder surface, I’m guessing it might be very hard to get a highly accurate and correlating measurement.

In my view, This is different to a PM measurement because if you consider the air inside a room, even if runs over a hot or cold surface it shouldn’t considerably change the density of the PM in that air. Unless the surface collects, or absorbs, PM - but that’s a whole lot less likely than a surface that can affect air temperature.

I might be way off on this, but it does seem logical?

#64

Here are 3 sensors measuring the temperature, all on the north side of my house or garage. The Netatmo sensor is within 30 cm of the Airgradient outdoor sensor. The sensor in the ComfoAir is pulling air from an outside vent at 210 m3/h so should be completely independent of shade/sun. It is also cloudy and gloomy outside, so the sun shouldn’t have any impact.

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#65

Why just not add a real sensor for outside unit … based os sth 41 ot sth45? … ad relesase modytified base part of the case… as shop upgrade or 3d pritable stl file?

Istead od hiding this fuckup for year(s)?

#66

@TeMpL thank you for your feedback. I’ll bring this up with our CTO.

#67

I just stumbled upon this. Do I need to do something to correct my temp and humidity? Where do I do it?

#68

Hi @talormanda, the AirGradient Open Air correction algorithm for temperature and relative humidity should be applied automatically by default, but you can double-check on your monitor’s calibration settings. It should be ‘Standard AirGradient Open Air Calibration’.

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Please note that the AirGradient Open Air’s temperature and humidity sensor is integrated inside the PMS5003T module. It is primarily used for improving PM reading accuracy. Since it is located inside the PMS5003T, the reading could deviate compared to the ambient temperature.

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#69

Gotcha. I will then trust this as just air quality and continue to use my other separate temp/humidity sensor for accurate data for that part.

2 Likes
#70

@talormanda thank you for your understanding!

#71

“I can be the first to try a fixed unit and a fixed base if you need to compare two units in the same location, which currently does not work. Fix the issue and stop selling crap that doesn’t work.”

#72

@TeMpL I appreciate your enthusiasm to help us test the product. However, before we go further, may I ask you to be respectful and polite in our community forum to maintain a nice and constructive atmosphere? I understand your resentment, but I hope you agree that we should keep it constructive and respectful.

For the Open Air, as we discussed before, we tried to keep the product simple, highly affordable, and primarily focus on PM2.5 monitoring, not as a weather station. And for that part, the Open Air has been proven to be an excellent low-cost air quality monitor. We also clearly stated on our shop page that the temperature and humidity sensor is used for PM2.5 correction, not primarily for ambient temperature and humidity monitoring.

We will definitely continue working on improving our product, but the Open Air might not be the first on our list currently.

#73

Again… just disable temperature reporting then, or fix it… Product is still for sale…

#74

Thank you for your feedback. If I remember correctly, I was informed that in the early days of the AirGradient Open Air, we preferred not to show the temperature entity on the Dashboard, but later, there were some requests from customers that they would love to see it. I believe that’s a business decision we made. But again, thank you for your feedback about this.