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

From: Prof. Dr.-Ing. Heinrich Warmers
Subject: Re: [Paparazzi-devel] alt_hold - lisa_m + bmp085
Date: Wed, 20 Mar 2013 07:27:33 +0100
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; de-DE; rv:1.4) Gecko/20030619 Netscape/7.1 (ax)

the Booz use the idea from the mikrokopter baro system.
It has a analogue filter and a high  resolution.
To use the analogue sensors from freescale in combination with analogue filter and a damping material
are the best on multicopters.
I frond with this solutions 24bit SD-ADC analogue filter and the freescale sensors is the best solution.
(like on the HB-Autopilot). I measure a resolution of 3-5cm. !
This kind of solution are also used from the  Oliver Meister  ( UNI Karlsruhe group) .
He uses the MPXHZ6115A and the AD7787 with an resolution of 0.01Pa (BMP085 1Pa)
The digital sensors have a good  accurateness to estimate the altitude 1Pa, but the resolution is relay bad  in comparison to other.

Cheers, Heinrich

Felix Ruess schrieb:
Hi Eduardo,

the booz board has a higher resolution analog baro (also requiring more components and a DAC to set the offset voltage).
So the altitude measurement on the booz boards is definitely a lot better than with the BMP085...
The MS5611 should be quite a bit better than the BMP085, but I don't know how it compares to the analog baro on booz.

Cheers, Felix

On Tue, Mar 19, 2013 at 9:11 PM, Eduardo lavratti <address@hidden> wrote:
Well, i am search for ppz altitude hold and found this videos:

i think this videos have made using old ppz booz hardware.
I never get any result like this.

anybody get a good alt_hold using bmp085 ?

i will continue my tests but i appreciate any help with config.

attached are the bmp085 capture.
As you can see the variation is about 2m.
i captured this inside home with all door and windows closed.

outside the graphic have much more peaks and the rotorcraft jump when peak occurs.

> Date: Tue, 19 Mar 2013 08:42:15 +0100
> From: address@hidden
> To: address@hidden
> Subject: Re: [Paparazzi-devel] alt_hold - lisa_m + bmp085

> Hi Eduardo,
> > after some months of hard work with paparazzi i can tell that my
> > rotorcraft is flying 100% stable end navigation is almost perfect.
> >
> > Yesterday i do lots of test using bmp085 and the altitude hold work with
> > much variation.
> >
> > for a test i installed a SONAR (matixbot) today and the altitude hold
> > work very well but only after i disable barometer because INS add some
> > kind of baro diff to SONAR.
> >
> > After i configured GUIDANCE_V to get a good alt_hold using SONAR e
> > enabled the BARO again.
> >
> > The result is the same as a started the tests... the altitude hold with
> > bmp085 has much variation.
> >
> > Has any set to filter barometer ?
> > the aspirin 2 with ms5611 has a better alt_hold than bmp085 ?
> >
> > I ask about bmp because i tested the last ardupilot model with ms5611
> > baro and altitude hold work much better than the old version with bmp085.
> there are a simple static tests with recent barometric pressure sensors:
> Martin
> _______________________________________________
> Paparazzi-devel mailing list
> address@hidden

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