Re: [Paparazzi-devel] ins alt_float using barometer.

[Felix Ruess]

Hi Eduardo,

you should use absolute pressure (preferrably in pascal) and not the altitude.

INS_BARO_SENS is the scale factor to convert pressure changes to changes in meters at your altitude.

I still haven't had time to write a proper generic baro interface (where you just pass the pressure and it does averaging, offset and conversion to meters according to the real atmospheric pressure formula).

If someone wants to start on this it would be very much appreciated.

Cheers, Felix

On Mon, Aug 5, 2013 at 7:30 AM, Eduardo lavratti <address@hidden> wrote:

What is correct when using barometer:
1 - use the calculated altitude from baro
2 - use absolute pressure ?

When i upgraded my flywing with master branch the alt ins not work fine because it using baro absolute pressure without altitude calculations.

Then i modified the baro_bmp to propagate the AGL altitude as due on baro ms5611.

when i make the maiden flight my wing not stop to gain altitude.
The problem is that the signal on ins alt_flot.c has inverted.

I think the best way is the sensor propagate the absolute pressure and then the baro board module convert the pressure to AGL.

So ... what is correct ?

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