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understanding numbers

Posted by martin keilloh on March 12, 2013 at 2:12pm

Hi when i do a download of the logs I get the following raw numbers,

    Accel X = 0.60           Accel Y = o.47 and Accel Z = -9.84 these numbers vary a little but remain similar through out the log,my real question is why is the Accel Z so different.

                        Many Thanks,Marty.

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Replies

  • Mike Boland March 12, 2013 at 2:50pm

    Z axis is vertical and shows the acceleration due to gravity of 9.8m/s/s.

    If you hold the copter on it's side or nose down then the X or Y will read 9.8 and Z will be closer to 0

  • MR60
    Hugues March 12, 2013 at 2:45pm
    Hello,
    AccelZ is around -9,81 because it is the value of our planet's gravity acceleration in meters per second per second. The acceZ measires acceleration up/down.So when not moving, accelZ measures gravity.
    If you flip your apm upside down, accelZ will show a positive 9,81 instead of negative!
    Hugues
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