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Thread: The Ultimate Axon Thread

  1. Re: The Ultimate Axon Thread

    Quote Originally Posted by Adrenalynn View Post
    What do you send to a standard pwm servo to get it to report back its position? That's magic I wanna learn - teach me?
    I think you misunderstood the conversation?

    You pose the servos, not by physical manipulation with angle sensor feedback, but by scroll bars in a GUI that update servo positions in real-time. Then save the angles once your happy with them as a pose. Its much faster than the tweak, compile, upload, test cycle that takes forever.


    Quote Originally Posted by Adrenalynn View Post
    What do you send to a standard pwm servo to get it to report back its position? That's magic I wanna learn - teach me?
    And to actually answer your question, you solder a single wire to the potentiometer output pin of the servo and connect it to your mcu ADC. From there you just map the voltage to the angle using basic interpolation. The Axon has 16 ADC, so not difficult to do for a biped using $20 servos.

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    Re: The Ultimate Axon Thread

    Yes, that was the program I was talking about from lynxmotion. I ask because that is what I used before, when I had the bot board and the ssc-32. And I am not good with the programing part of robotics. Need more practic.

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    Re: The Ultimate Axon Thread

    Ah, my mistake. I think the definition of "pose and capture" got re-posed in the marketing department. [Not yours, John...]
    I Void Warranties´┐Ż

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    Re: The Ultimate Axon Thread

    Quote Originally Posted by societyofrobots View Post
    ...
    And to actually answer your question, you solder a single wire to the potentiometer output pin of the servo and connect it to your mcu ADC. From there you just map the voltage to the angle using basic interpolation. The Axon has 16 ADC, so not difficult to do for a biped using $20 servos.

    I have a tutorial and sample code for the Arduino and python in the tutorials section that shows exactly how to do that. The pot is a bit noisy when it's moving so some basic filtering is needed but other than that, it's pretty simple.

    http://forums.trossenrobotics.com/tu...by-servo-3279/
    Last edited by jes1510; 10-21-2009 at 11:22 PM. Reason: tutorial linkage
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