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You can also calculate Altitude. '''However, you can only really do a good accurate job of calculating altitude if you know the hPa pressure at sea level for your location and day!''' The sensor is quite precise but if you do not have the data updated for the current day then it can be difficult to get more accurate than 10 meters.
You can also calculate Altitude. '''However, you can only really do a good accurate job of calculating altitude if you know the hPa pressure at sea level for your location and day!''' The sensor is quite precise but if you do not have the data updated for the current day then it can be difficult to get more accurate than 10 meters.
== La pression PNM ==
Les stations météo professionnelles affichent des pressions dites "PNM" (PNM: Pression Niveau Mer ou SLP: Sea Level Pressure).
Il est utile de savoir ce que c'est et comment calculer une telle pression.
[[Fichier:Pression-PNM.jpg|800px]]
[[FEATHER-MICROPYTHON-BMP180#La_pression_PNM_comme_sur_les_stations_m.C3.A9t.C3.A9os|Voyez cette section de notre autre tutoriel détaillant le principe et le calcul]] avec un BMP180 (un autre senseur de pression).
== Référence de la bibliothèque ==
== Référence de la bibliothèque ==