Xbee RTH failsafe

Posted by Bill on November 24, 2011 at 10:45am

So I am interested in playing with FPV, although I am paranoid that if I fly more than several hundred feet away I will lose the signal and crash.  So what I am interested in is a failsafe that will automatically trigger RTH when either direction of the bi-directional telemetry signal fails.

 

How I imagine this working:

  • Each telemetry message from the quad contains a timestamp.
  • Ground station periodically sends a heartbeat to the quad echoing the latest timestamp received from the quad.
  • The quad continuously checks the latest heartbeat received from the ground station.  If it is more than several seconds old, it will automatically return to home.

 

Can anyone tell me if something like this exists, or would be feasible to implement?

 

Thanks!

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Tags: failsafe, rth, telemetry, xbee
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Replies

  • Bill November 24, 2011 at 11:37am

    Thanks, it would be a ton easier to just use a Tx/Rx failsafe.

     

    While I'm at it, could someone recommend a good Tx/Rx system for FPV?

  • Jason Wise November 24, 2011 at 11:29am

    Yeah go for FrSKY....its as easy as this, in my case just had to flick my switch that initiates RTH and wham! it works

    FrSKY series receivers support failsafe function for all channels. Follow the steps below to set failsafe:
    1) Bind the receiver first, and disable failsafe on the transmitter side;
    2) Set all transmitter controls to the desired failsafe position;
    3) Press briefly the F/S button of the receiver, the GREEN LED of the receiver will flash twice, indicating the failsafe is set up successfully.

  • Gustav Kuhn November 24, 2011 at 11:11am

    Why don't you just use the Tx/Rx failsafe function ?

    I'm using a FRSky system in my JR 9X II, programmed the failsafe to continue the mission in Auto on signal loss.

    Have to admit, the first time I deliberately switched to Tx off to test, I kinda forgot to breathe for a while there :-)

    Just as easy to program the failsafe for RTH..

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