Re: [Paparazzi-devel] alt_hold - lisa_m + bmp085

[Eduardo lavratti]

I found a problem.
Today i put a external bmp085 in my lisa_m and the altitude hold work very well.

i think the onboard sensor is problematic.
Even in the graph plot i can see the difference between 2 sensors.

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From: address@hidden
To: address@hidden
Date: Wed, 20 Mar 2013 18:47:15 -0300
Subject: Re: [Paparazzi-devel] alt_hold - lisa_m + bmp085

Yes, all boards in the same frame.

About vertical acc, if i disable de baro/sonar (put 0 in baro and sonar values) the quadcopter try  maintain altitude only based in acc and it work very well.
My problem is BAROMETER.

> To: address@hidden
> Date: Wed, 20 Mar 2013 22:25:23 +0100
> From: address@hidden
> Subject: Re: [Paparazzi-devel] alt_hold - lisa_m + bmp085
>
> The resulting altitude is not just taken from baro sensor, it is
> calculated from the vertical acceleration between the baro measurments.
> So what would i looked here at is a calculated altitude/clean baro values
> comparison. If their behaviour dont match, the problem is in acc
> measurments.
> As I already mentioned, the resulting altitude estimation is very
> sensitive to the vibration level.
> Did you try all the different boards on the same copter frame with the
> same mounting?
> Regards,
> Sergey
>
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