Centering servo before disarm

Posted by The Sea Captian on June 4, 2014 at 9:14am

For my project I am using a linear servo. When the pixhawk is disarmed the linear servo will stay in position. So if it is fully extended for a left turn, when the pixhawk is disarmed the servo will stay fully extended.

Is there a way (such as a command) that will center a steering servo? The uav will be controlled via cellular signal commands to the pixhawk via mavlink pushed by an arduino board.

Example: Before sending a command to the pixhawk to disarm, i want to make sure the servo is in the neutral position. So I would want to send a "servo return to neutral position" command before the "pixhawk disarm" command.

thanks!

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Tags: center, command, pixhawk, servo
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Replies

  • MikeRover June 4, 2014 at 5:38pm

    Switching to HOLD mode before you disarm should set the steering and throttle to their trim positions.

     

    Depending on the speed of your steering, you may want to give a one or two second delay before the disarm.

  • Admin
    Thomas J Coyle III June 4, 2014 at 12:17pm

    @TSC,

    I believe that when the Pixhawk is disarmed the Servo Output channels go to OFF (no output). That is what I have seen with my servo tester, that can measure the PWM output of a servo output channel, on the throttle channel and I would assume the steering channel too, prior to arming and after disarming the Pixhawk.

    Regards,

    TCIII ArduRover2 Developer

  • Developer
    Linus June 4, 2014 at 12:12pm

    Hi The Sea Captain,

    i guess you want to checkout MANUAL_CONTROL

    or RC_CHANNELS_OVERRIDE for this.

    Regards,

    Linus

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