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Re: [Paparazzi-devel] Problems with Tiny13 and Graupner MC22 digital-ser

From: Eric BAHIER
Subject: Re: [Paparazzi-devel] Problems with Tiny13 and Graupner MC22 digital-servos and compile-erros
Date: Tue, 23 Aug 2011 22:39:07 +0200
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An possible reason of yours problems, the aswer in your mail

Le 23/08/2011 22:27, Prof. Dr.-Ing. Heinrich Warmers a écrit :
Hello world,

today we have found same reasons for the malfunction:

1. One digital servo (elevator) stop moving  and hang sometimes  by  collection to  receiver  or tiny13 . Connecting to a spectrum 2.4GHz  the servo work without problems.

Propably, your servo have a big current drink, and generaly on numerique servo this curent is drink in very small time, and very big current, this the perfect scheme to fail the small power supply of the tiny.
    Has someone had trouble  with digital  servos  by using a Graupner  35Mhz transmitter?  Is the impulscheme other than by analog servos?

generaly, it is not a transmiter problem, its a receiver problem, or a servo spec. Some servo ask to have the same level for the pulse and for the  power.(they don't like to have a 5v signal and a 6v power....)
2. Compiling with an old Siemens laptop results in a wrong  object code in the LPC2148.  There were no error massages given. By using a new laptop compiling  the same sources we found no malfunction.

"very fun", good luke.....

Heinrich Warmers

Prof. Dr.-Ing. Heinrich Warmers schrieb:
Dear Christophe,
tanks for the information.
We use 868 MHz  and will test the  ACT-reciever from Mikrokopter.



Christophe De Wagter schrieb:
The Penta Profi is not a good receiver in the presence of noise. E.g. with our 868MHz longrange modems we start getting very significant interference at 100m and at 300m loose control. Other receivers like the one they sell at mikrokopter are far less sensitive to this. 


On Wed, Aug 17, 2011 at 10:17 PM, Prof. Dr.-Ing. Heinrich Warmers <address@hidden> wrote:
we are flying the  following configuration:
Graupner MC22  (9 channel impulses),
Profi Penta RC- receiver,
25A Hype bruschless controller,
3 Hitec digital servos.

In  manual and auto1  mode we lost often and sporadic the control  over the aircraft.
The result is a crash.
It seems that the servos make maximum ways and the neutral setting is wrong.

For a configuration with:
MC16/20 and MC15 (8 channel impulses),
Hitec-RC-reciever and
2 Hitec analog servos
we have never seen a malfunction.

Has someone a idea how we can find the error?

Heinrich Warmers

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