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Re: [Paparazzi-devel] On Screen Display (Reto Buettner)

From: Bernard Davison
Subject: Re: [Paparazzi-devel] On Screen Display (Reto Buettner)
Date: Wed, 3 Aug 2011 18:36:27 +1000

You'd have to have a separate path to control the servos.

At the moment everything is going through the paparazzi flight computer.
So if something in it crashes then the system will be left hopefully in a failsafe mode.

On 03/08/2011, at 6:30 PM, Rui Costa wrote:

Since we are talking on redundancy. Is there any way to have a sorte of an watchdog board that will change to an independent manual control of the aircraft if any paparazzy board crash was detected? Some kind of a relay/switch?
Best regards
Rui Costa

On Wed, Aug 3, 2011 at 8:09 AM, Reto Büttner <address@hidden> wrote:
Hi Vladimir,

the effectivity of redundancy measures depend very much on the failure
mode. If the main Paparazzi board completely fails, you are right.
Then the plane is not steerable anymore, neither autonomously nor
manually and the plane crashes. The main Paparazzi board is a very
hard to avoid single point of failure. But if the main paparazzi board
only fails partially (e.g. autonomous control loops not working
properly anymore), only the GPS, the IR sensors/IMU/INS/AHRS or the
serial data link fail, then the redundancy using FPV and a separate
OSD will save your aircraft.

Cheers, Reto

2011/8/2 Volodymyr Khudyakov <address@hidden>:
> If Paparazzi fails, you simple fall to ground...
> All control you have from AP board and any OSD can help you.
> Sincerely
> Vladimir
> Date: Tue, 2 Aug 2011 15:21:47 +0200
> From: Reto B?ttner <address@hidden>
> To: address@hidden
> Subject: Re: [Paparazzi-devel] On Screen Display
> Message-ID:
>        <address@hidden>
> Content-Type: text/plain; charset=windows-1252
> The OSD of C?dric based on the Paparazzi data stream is great. Very
> compact and well integrated. Thanks for developping and sharing.
> For long range missions I prefer a separate OSD system for redundancy
> reasons. If Paparazzi fails you can complete the mission using FPV and
> OSD. If FPV and/or OSD fail you can complete the mission using
> Paparazzi.
> Cheers, Reto
> _______________________________________________
> Paparazzi-devel mailing list
> address@hidden

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