Discussions

Joystick for APM2.5 (Urgent)

Posted by Roy Le on March 24, 2014 at 5:36pm

Hi Guys,

 

I use a Logitech USB joystick to connect my APM (with Xtend900 radio and windows 7). then switch on the joystick function, the servos can work, but after several seconds, the servos are freezed. it seems large data workload for APM, what can I do? Any insight you have into helping me is appreciated. thanks so much!

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Replies

  • Developer
    Michael Oborne March 25, 2014 at 10:28pm

    what data rate do you have your radios set at?

    • Roy Le > Michael Oborne March 26, 2014 at 12:36am

      You mean 'Expo' value? I have tried the maximum and minimum exponential control for these two RC channels, Same.

      Btw, if it was caused by servo's power, why does it can work within seconds? anyway, I will test it. thanks so much!

      • Developer
        Michael Oborne > Roy Le March 26, 2014 at 3:48pm

        no.

        how fast can that data flow between the two radios.

        • Roy Le > Michael Oborne March 26, 2014 at 7:30pm

          Currently, it was set 57,600bps (the Xtend can be set from 9,600 to 115,200).

          I noticed the xtend signal was reduced from 100% to 60% when I enabled the joystick, if I kept moving the joystick, the xtend signal would be lost.

  • Roy Le March 25, 2014 at 10:01pm
    UAV: Xtend900 -> APM2.5 -> servos, and the servos(2x 5g) are powered by APM directly because the power is very small. (Some guys told me: they met the same problem on Xbee or 433 radio), does it caused by the power? I will test it ...
    • Moderator
      Graham Dyer > Roy Le March 25, 2014 at 10:07pm

      It is not recommended to power servo's from the APM, some servo's can draw 1A each under load. You can check by looking at Vcc in the log, it must stay around 5V.

      Servo's must be powered separately otherwise you will have brownout.

      I have no problem with 433 radios

      • Roy Le > Graham Dyer March 26, 2014 at 6:50am

        just try the separately power, same problem.

        and I noticed the xtend signal was reduced from 100% to 60% when I enabled the joystick, if I kept moving the joystick, the xtend signal would be lost. I have tried under '0-50 Expro'.

  • Roy Le March 24, 2014 at 11:34pm
    it seems caused by the radio buffer data accumulation (same problem on Xtend900/Xbee/433), is there anyone provide help to me? thanks!
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