3 ms·

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

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.

cerberusss 6y ago
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.