Altitude obviously wrong

[nesdnuma]

Hello,

I am trying to use your library on an Arduino UNO R2. The temperatures provided by the MS5611_simple example seem to be correct but not the absolute altitudes (I have 26m instead of 57 above sea level).

[impala454]

Weather conditions affect the pressure readings so you're not going to get an exact altitude calculation unless you can feed in a nearby sea level reference pressure. The absoluteAltitude = ms5611.getAltitude(realPressure); in the example is a bit of a misnomer. If this is for a moving device, you could always call the getSeaLevel() function to get that sea level reference pressure, given the known starting altitude. If it's a fixed base device well then you can just look up the altitude.

[nesdnuma]

OK, thanks!