Build yourself a weather station

Re:Build yourself a weather station by Wubdidu on Monday June 15, 2020 @04:45AM (#23525235)

I'm by no means an expert on this, but I had some issues with the temperature reading of the BME280. It seems to be so sensitive that simply having it on top of a Wemos D1 Mini shield PCB cause the temperatures to differ by more than 2 degrees celsius because the heat of the ESP module seems to radiate up to the BME280 (or transfers through the wires/traces). Just having my finger right above it ticked off the temperature reading, so I assumed even indirect sunlight on it or similar things might give wrong readings too.

I resorted to adding a DS18B20 for temperature readings and only using the air pressure and humidity of the BME280. I could design a PCB that moves the BME280 further away from the D1 Mini with tiny traces to avoid heat transfer, but then again I didn't want to risk it and a quick research showed that the DS18B20 seems to be reasonably accurate as well.

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Re:Build yourself a weather station by cerberusss on Monday June 15, 2020 @05:51AM (#23525601)

The author didn't say so, but I'd assume these sensors must be placed in a small oven of some kind, so as to introduce averaging and hysteresis of temperature.

When I brew my beer, I need to look at the environmental temperature. I can't stick the thermometer in the beer because it'll be contaminated. So I put a thermometer in a glass of water which I place next to the beer vat.

I'd expect you'd have to put that BME280 in a small metal oven, or submerge in a volume of oil or water. It'll screw up the barometer probably.

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