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My new octocopter frame

Posted by Peter Koch on March 13, 2011 at 2:30pm

This is the new folding frame Project I am working on.

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Can anyone tell me if it´s possible to control the eight counter rotating motors with ACM.

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Comments

  • Developer
    Jani Hirvinen March 14, 2011 at 7:10am

    Actually ACM has full support for Tri, Quad and Hexa's already.

     

    For coaxial setups you should have separate control for all 8 motors due lower motors needs to run with slower and optimized speed or you waste a lot of mAh's for fighting against the wind.

     

    Using 8 PWM outputs from APM is a bit tricky due hardware issues. OUT5-6 cannot be used to Fast PWM due hardware issues on microprosessor.

     

    I2C is also a bit tricky to use due if one I2C fais they all fail. This is due I2C bus.

     

    We are working on UART based ESC's that are safer to use in 8+ configurations. No real ETA for those.

  • 3D Robotics
    Chris Anderson March 13, 2011 at 4:25pm

    I think eight is supported by the ArduPirates code.

     

    ACM will start with quad and tri support

  • Peter Koch March 13, 2011 at 3:56pm

    @ Ike: The developmet is made with SolidWorks.

     

    This was also my first thought but of the coax config I will los the Yaw effect.

  • DaveyWaveyBunsenBurner March 13, 2011 at 3:43pm
    If you are runnint 8 motors in a standard coaxial configuration you should be able to run it using y leads to split 4 channels into 8.

    In a coax config, two motors receive exactly the same signal.
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