barometer fluctuation

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atomer
Posts: 11
Joined: Fri Apr 15, 2016 8:58 pm

barometer fluctuation

Post by atomer »

Hello,
I installed BMP180 on my Flip 1.5 MWC. I also enabled on config.h file (version 2.4). It shows reading on MultiWii GUI.
When I request for est altitude using MSP_ALTITUDE, it gives me negative and different values each time I request. You can see it in some samples below.

I'm guessing Multiwii is calculating altitude from mean sea level pressure? If so how do I get relative altitude (zero when I'm ready to fly) ?

Thanks in advance

Code: Select all

est altitude: -188 cm   Vario: 0 cm/s

est altitude: -186 cm   Vario: 0 cm/s

est altitude: -175 cm   Vario: 0 cm/s

est altitude: -177 cm   Vario: 0 cm/s

est altitude: -152 cm   Vario: 6 cm/s

est altitude: -154 cm   Vario: 0 cm/s

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