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Re: [Paparazzi-devel] someting unpredictable

From: Christophe De Wagter
Subject: Re: [Paparazzi-devel] someting unpredictable
Date: Fri, 15 Apr 2011 21:04:18 +0200

Dear Mike,

You should ALWAYS be able to switch back to Manual, with good or bad thermopiles or even no thermopiles at all. 

The main options I can think of a the moment to "lock" up your autopilot like you describe are:

-Over-power your autopilot: (twog and tiny2 can deliver about 2.25Amp, Tiny 1 about 1.5Amp: 0.3A for uController, 0.4A for modem, so roughly 0.9 to 1.5 left for servo's... multiple and/or fast and/or strong servo's can easily overload your board. Especially when you switch to auto mode, the servo's usually move more then in manual...
-RC link out of range (usually the RC is the weakest link) should make paparazzi switch to auto2/home. If the plane was not tuned yet that can be catastrophic.

In both cases the logfile plotter or replay can help to reconstruct: did you still get data during the crash? did you see a second boot message? Was there RC-lost? Or dit the telemetry just stop? 

There are certainly other possibilities. Did you add a lot of own code for instance? But the above 2 are the most likely.

PS: Before switching to auto1 inflight, do it on the ground with the plane over your head to check the elevator going up when nose down etc...


On Fri, Apr 15, 2011 at 6:54 PM, Michael Weigand <address@hidden> wrote:

I had a plane fall from the sky the other when I switched into AUTO1
mode and couldn't switch back out.. in AUTO1 it threw all the control
surfaces to their extreme ends (elevator down, ailerons right, rudder
right) and the plane locked up and nose-dived. I suspect my problem
might be related to my thermopile sensors not being correctly aligned
(the wiki is pretty vague on it..), but I still can't figure out why
manual control didn't restore after I switched back..


On Fri, Apr 15, 2011 at 4:24 AM, GARCIA ALVAREZ, ANA
<address@hidden> wrote:
> Hi Roman,
> I have had the same problems you are relating. My RC link frequency was
> 35Mhz. I have recently moved to 2.4GHz and apparently I have no “automatic”
> mode switch.
> As to the GPS, I had accuracy problems related to the fact that my 2.4GHz
> modem was close to the GPS receiver.
> Ana
> _______________________________________________
> Paparazzi-devel mailing list
> address@hidden

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