Re: [Paparazzi-devel] problems with the rc link

[Christophe De Wagter]

It looks like your extra "safety" mux is making it less safe! According to the webpage I google'd this switch uses a single RC channel to switch between the autopilot and the remote control. However, when you go out of range, then the RC doesn't work (which is normal) and your safety switch is switching at random as your receiver picks up noisy signals out of the air (normal but not nice!)

If you give the entire pulse combination from your receiver to paparazzi directly, it will check its integrity using all the defines from your radio file (repeat frequency, nr of pulses, etc: you can even make this so specific that it will accept your transmitter and not another type). If a full frame (full series of all pulses from all channels+ repeat rate) is not according to the definition, it is rejected. If too many frames are bad (RC REALLY LOST) then the autopilot takes over, which is probably better than random servo's. 

Using the paparazzi autopilot as safety switch is as safe as it gets. This will stop the "uncontrolled switching" but will of coarse it will not increase your RC range. To solve that part, relocate stuff in you plane, shield things, use ferrites, remove ground loops, use better quality receiver, etc...

Christophe

On Thu, Sep 2, 2010 at 2:03 PM, Ana García <address@hidden> wrote:

Hi,
I have been testing today the rc link range and have experienced some problems. My configuration is the tiny 2.11. The modems I use are xbee pro(2.4GHz), and my rc link is through 35Mhz. I use a Corona receiver with the PPM  Encoder. In addition, I have a failsafe mux(from diydrones), so I have done some "Y" in order to output the signal from the RC receiver to the PPM encoder and the failsafe mux.
 
We've launched a flight session and verified that we had manual/autopilot swich control and when autopilot, auto2/auto1/manual control. Then we started moving away from the GCS. At some point, we lost the RC control and the engine started moving and stopping. The servos started moving autonomous. In addition, the failsafe mux has a led indicating manual/autopilot, and it looks like it switched alone.
 
I don't know if anybody has any idea about what may happen. We've thought about changing the rc receiver, including ferrites and removing the failsafe mux.
 
Thanks and sorry I've written a lot.

_______________________________________________
Paparazzi-devel mailing list
address@hidden
http://lists.nongnu.org/mailman/listinfo/paparazzi-devel