Thread: Quadrocopter project

  1. #46

    Join Date
    May 2005
    And as you say on your site, accelerometers measure linear acceleration, not rates of rotation. I haven't read further into your design, but what I can tell you from contract work my employer exposed me to, you're not really going to be able to 'determine orientation' from acceleration. The project I am referring to was a weather buoy project, that used accelerometers to transmit information about sea states. The problem is that as a buoy pitches, the accelerations have to be corrected for orientation (not the other way around!). The purpose of using a magnetometer to correct the accelerations for orientation was to decrease power consumption and cost.

    Regardless, the IMUs you've listed seem to package this all for you.


    But, I do want to say thanks for keeping track of the parts you've bought. I had started doing the research to build something similar and basically got bogged down with the many options out there. All the parts you'd found seem very reasonable as far as specs and cost.
    Last edited by BobMcGee123; 09-21-2010 at 05:49 PM.
    I'm not immature, I'm refined in the opposite direction.

  2. #47
    Registered User
    Join Date
    Dec 2006
    If you have an object that's not accelerating (stationary or not), the 3 axis accelerometers will output a vector of length 9.81m/s^2, pointing to ground.

    From the direction of the vector, we can calculate our pitch and roll. The only part of orientation we can't figure out is yaw, so I use GPS for that. Some people use magnetometers.

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