Yes, both side by side avoiding air flow, read both temperatures and you have the offset. Not accurate but working for me. If you do not have a real calibrated reference you can’t trust digital thermometers too and fever thermometer have a limited range. The ice water method is quite accurate as water with a good amount of ice cubes is quit precisely 0C.
The interesting temperature for my pond is 3.5 (<4) C. This is when surface ice is building if the air temperature is below 0C because below 4C the convection of water stops. This is when I stop my pump to avoid surface Ice building up quickly (cold water then would flow on-top of the ice layer)
Boiling water is a good reference too but not easy to handle on digital sensors.
I also have an IR thermometer but couldn’t reproduce the same results because it is highly influenced by the surface radiation or reflections. The metal case of an BMP seams not to be as good as the black surface if an microchip package.
At least part of the reason for that is that perceived temperature is not only affected by the air temperature (which is principally what the thermostat measures), but also radiant heat from (or to) the walls (as well as drafts, humidity and so on). Normally exterior walls are colder than the air temperature and that has an effect on perceived temperature, but when you turn the heat up for a while it warms up the structure of the building and that takes some time to decay, so for some time after the air returns to normal temperature the walls are still warmer than they normally are, hence the improved comfort perceived.
Totally agree. Furthermore when the human body feels a room “cold” it is (sometimes) influenced by temperature changes by entering a colder room or a continuous decrease if temperature . So when the heater sends out radiation the human body experience the heating as an increase of comfort which last longer than the actual raise of temperature. It is all about delta T instead of absolute temperature.
Hi I've been using a BME680 for about a year in my bathroom. I'm finding the temp, hum and pressure, excellent in measurement. The gas sensor is a little more problematic to get to work correctly. Timing is of the essence.
In the image a graph of the output your can see the peak at 8am when someone is using the bathroom, the green is the humidity and the yellow is the gas sensor. the blue is also humidity from another place in the house i use for comparison.
Our Victorian house can be so cold in the summer that you have to put a jumper on when you come in!
However, an ambient air temperature of 18 deg C is perfectly comfortable to the "Ambient Air Tester" (tm) - AKA, the "Wife" - but in the winter, that is considered cold.
