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Re: [Paparazzi-devel] ATMMega PPM Encoder

From: Alfonso Garrido
Subject: Re: [Paparazzi-devel] ATMMega PPM Encoder
Date: Tue, 24 Apr 2012 16:25:06 +0200

We have tried everything. Our PPM is blinking at 3Hz but no PPM arrives to the Yapa (all zeros message)! Plugging in servos directly to the receiver, they do follow the sticks. We cannot explain it! 

> Date: Mon, 23 Apr 2012 13:45:25 +1000
> From: address@hidden
> To: address@hidden
> Subject: Re: [Paparazzi-devel] ATMMega PPM Encoder
> > Our PPM encoder board is blinking at high rate and we have tried with
> > different cables to make sure nothing is broken, so our board and
> > connections seem ok.
> By high rate, do you mean ~1Hz or ~3Hz? If it's blinking at 1Hz, the
> PPM encoder is telling you that it's not outputting PPM, and your
> symptoms are expected. If it's blinking at 3Hz, you should expect to
> see PPM.
> >It may be something associated with any
> > failsafe issue?
> Perhaps. Can you test the PWM output of your receiver channels?
> If you have not changed the "throttle failsafe" configuration in the
> PPM encoder, and your chanel 3 PWM is > 2025 microseconds, then the
> PPM encoder will not putput any PPM and should be blinking at 1Hz.
> Simple check - is your receiver in failsafe? if you plug in servos
> instead of the PPM encoder, do they folow the sticks?
> Chris Gough
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