Re: [Paparazzi-devel] Problems with Tiny13 and Graupner MC22 digital-servos and compile-erros

[Hector Garcia de Marina]

They have to be connected as close as possible to the digital servos (as they are which demand the current peak).

If you have problems putting ceramic capacitors, try with low ESR ones. So low C + low R = high instant peak current.

It depends on your servos, power line, etc, in general this solution should work. If not, you should identify the problem with an oscilloscope capturing an "instant" dramatic voltage drop at the digital servos side to be sure that this is the actual problem.

Regards

On Thu, Aug 25, 2011 at 3:29 PM, Prof. Dr.-Ing. Heinrich Warmers <address@hidden> wrote:

Thanks for the information  Hector Garcia de Marina,

have you connected the capacitors in the impulse or vcc wire ?
Regards

Heinrich

Hector Garcia de Marina schrieb:

On Tue, Aug 23, 2011 at 10:39 PM, Eric BAHIER <address@hidden> wrote:

hello,

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.

Hi, I have a similar problem in the past but with other stuff. It was solved attaching two small capacitors (around 0.01uF) in parallel just to commit this kind of transient.

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-- 
Héctor