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Ligne 95 :
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→Testing the sensor
The sketch display pressure and other parameter every 2 seconds.
The sketch display pressure and other parameter every 2 seconds.
== Pressure and altitude ==
=== 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.
=== Sea level pressure ===
You can also calculate the altitude from the pressure. However, to proprely measure the altitude, you need to know the pressure at the sea level (hPa, pressure that change every day)!. The BMP280 is really precise, however it may be difficult to have precise evaluation of the altitude if you don't know the pressure at the sea level (the pressure {{underline|of day}} at the sea level).
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