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→Pressure and altitude
== Pressure and altitude ==
== Pressure and altitude ==
This section could also be named "the Weather Station OR the Altimeter".
Depending on the use case (weather station or altimeter", the way of using the BMP280 is slightly different.
=== About pressure reading ===
=== About pressure reading ===
The pressure is returned in Pascals (an unit from [https://en.wikipedia.org/wiki/International_System_of_Units International System of Units]). 100 Pascals = 1 hPa = 1 millibar. The barometric pressure is often using the millibar or mm of mercury as unit. Just note that 1 pascal = 0.00750062 mm of mercury mercure.
The pressure is returned in Pascals (an unit from [https://en.wikipedia.org/wiki/International_System_of_Units International System of Units]). 100 Pascals = 1 hPa = 1 millibar. The barometric pressure is often using the millibar or mm of mercury as unit. Just note that 1 pascal = 0.00750062 mm of mercury mercure.
Indeed, we can read the current pressure (without caring about the baseline) THEN we add the "correction" value --> Tadaaa! We have the SLP pressure (the same than displayed on Reference Weather Station).
Indeed, we can read the current pressure (without caring about the baseline) THEN we add the "correction" value --> Tadaaa! We have the SLP pressure (the same than displayed on Reference Weather Station).
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