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Re: [Paparazzi-devel] rc lost

From: Dylan Brunello
Subject: Re: [Paparazzi-devel] rc lost
Date: Thu, 5 Sep 2013 20:42:36 +1000


I think you can set FrSky receivers to output no pulses when the RC signal is lost. I used the following steps:
  1) Re-bind rx and tx to clear any old failsafe servo positions that were set
  2) Power the rx with tx off
  3) Press the bind button on the rx for a short duration (less than 1 sec)
I have only verified the behaviour using the GCS. With the RC transmitter on (3 position at manual) the Radio Command status says "OK"; with the transmitter off it says "Lost/None". I had a look at the PPM messages however they seem to remain fixed at the latest values with the transmitter off or the receiver fully unplugged. I will try to check that the PPM goes to nothing with an oscilloscope when I get a chance. Have you already tried this? I'm just setting up my first plane and I'd like to have the failsafes modes working properly.


On Tue, Aug 20, 2013 at 2:01 AM, Michal Podhradsky <address@hidden> wrote:
Hi Refik,

if you are using the paparazzi 8ch ppm encoder I would look into paparazzi wiki, there is a page about it (

Btw all FrSky receivers with CPPM output are sending out the PPM stream even when the RC signal is lost. The values of each channel in case of RC lost can be set. Although this "failsafe" feature is handy for RC airplanes (it is usually configured to kill throttle and turn left/right), paparazzi currently cannot recognize it properly (autopilot still receives PPM signal, so it is "happy").

The way to handle that would be monitoring the values on selected signal and if it goes over "normal" value, it is recognized as RC lost.

A patch would be helpful.


On Sun, Aug 18, 2013 at 10:50 AM, Refik Sever <address@hidden> wrote:
Dear all,

We are using Turnigy transmitter (ER9X firmware) with its standard RF9xv2 receiver. We couldn't find how to set the failsafe with ER9X firmware. Is there anybody who knows this?

We are using 8 ch. PPM Encoder. Currently the autopilot behaves like this: When the autopilot is in Manuel mode, if I turn off the transmitter it goes to Auto1. When it is in Auto1 or Auto2 modes, if I turn off the transmitter then it holds its state.

In the GCS, when I turn off the transmitter then it writes "NONE" in radio command status. And I can take it to Auto2 mode by sending Auto2 command from GCS, if the transmitter is closed. I can not do that if TX is open.

 If the autopilot knows that RC is "None", then why doesn't it automatically go to Auto2 mode?
Can I program it to behave like that? 

We are waiting for your suggestions.


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