Setting throttle failsafe with EZUHF and Taranis Please help.

Posted by Phil Horner on March 24, 2015 at 3:11pm

Hi everybody.

I'm desperate and can someone please help. I'm trying to set the Failsafe on my Pixhawk so that when my Taranis loses the connection or gets turned off the RTL jumps in. I'm using a EZUHF RX. I've done just about everything I can think of to get it to work but no luck. I'm worried the answere is obvious but my brain now is mush and I probably can't see the wood for the trees.

As it stands now, my min throttle is 1117, my max is 1873. My FS Pwm is 1049 and when I turn off the Taranis the Initial setup / Failsafe / Channel 3 (throttle channel) reads 993. At this stage the RTL or Land should jump in but I get no reaction at all. It just stays in Stabilise mode.

Again, please help. I don't have much hair left.

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Tags: ezuhf, pixhawk, taranis
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Replies

  • 100KM
    Hein du Plessis December 9, 2015 at 5:41am

    I'm tearing my hair out here. I also have a Taranis with OpenTX 2.1 and EZUHF. I can't get the pwm values below 999! I've tried extended trim, offset, everything I can think of.

    How can I tell the receiver to send out a lower PWM on Throttle?

    • Richard Kennedy > Hein du Plessis December 9, 2015 at 5:49am

      Look in the documentation for your RX and look for a way for it to 'don't send pulse' or 'send no pulse' then you turn throttle FS on in MP to a number 10 or so below what your lowest throttle setting is when your TX is on. Is this what you mean? Some RX's don't have that option. Maybe your EZUHF doesn't do that. 

    • 100KM
      Hein du Plessis > Richard Kennedy December 9, 2015 at 7:16am

      Thanks for replying. No such option on EzUHF though. I've set my throttle trigger to 1002 uf, set failsafe on trasmitter and used throttle trim to take the throttle higher, to 1020. This works but it will mean the plane will failsafe if I ever touch the throttle trim again..

    • Richard Kennedy > Hein du Plessis December 9, 2015 at 12:08pm

      Well as long as you do the calibration for all your channels in MP with the throttle trim up a bit then I guess that should work just fine. You shouldn't need to trim it lower right? As long as bringing the throttle stick all the way down shuts off the motors you would never need to touch the trim right? I think that's what Justin was getting at above. 

    • 100KM
      Hein du Plessis > Richard Kennedy December 9, 2015 at 12:15pm

      Yes, just odd that I can't trim the throttle below 1000 uf. I just feel uneasy doing it this way.

    • Richard Kennedy > Hein du Plessis December 9, 2015 at 1:02pm

      Let me know how it works out it would be good to post here for reference. Thanks

  • This reply was deleted.
    • Richard Kennedy April 21, 2015 at 4:01pm

      Yea TX off won't work... bummer. 

      Yea I really should I install that companion software!!! 

  • This reply was deleted.
    • Richard Kennedy April 21, 2015 at 3:30pm

      I looked at the manual and that ezuhf can't / doesn't do no pulse aka zero ppm. I am wondering however if you simply shut off your TX then reprogramed the ezuhf to use those channel positions [which would be zero ppm because it's off] so then that would get the result you want... a really low ppm? 

      Otherwise I get where your going I think. So you raise your radio's lowest ppm do the pixhawk radio calibration then got back to the higher setting but... I don't think it would fly right unless you re-centeted all your sticks centers?? gees man I have a Taranis yours is similar that sounds like about 1.5 million menu button presses!! LOL there must be a better way. Just for the heck of it try resetting the FS like I mentioned above [ with your TX off ] and least that's easy to try I would think. Then again it might not work if it doesn't see any TX signal. 

  • This reply was deleted.
    • Richard Kennedy April 21, 2015 at 12:55pm

      Justin

      Throttle FS needs to be set up with your RX. You need to look up the directions for your RX and see if it has the option to do 'no pulses' on lost TX. Some do some don't. What this does is send zero ppm if it losses signal which then the pixhawk or APM see's that triggers the throttle FS in the pixhawk or APM if you have this turned on. This set up is better in many ways to the RX simply going to set default channel outputs [ some RX only have this option ] as there can be several unintended problems with this way of going about it. 
    • Henri April 21, 2015 at 12:47pm

      Hi Justin.

      Happy that you can't achieve it with full trim.. Imagine trimming in flight?

      - Sub trim in your radio will normally let you go lower and servo extend as well. 

      - When you are as low as possible store this value in your receiver, as failsafe, and then power the receiver down.

      - Bring back your Transmitter throttle value to a normal value (you mentioned 991 uS).

      That should work.

      Henri

This reply was deleted.