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J
JDave.4
Visitor II
June 30, 2022
Question

Conversion from Roll-Pitch-Yaw to Phi-Theta-Psi

  • June 30, 2022
  • 3 replies
  • 2281 views

Hi,

The output of MotionDI algorithm is Roll and Pitch angles. How can I convert Roll-Pitch-Yaw to Phi-Theta-Psi? Thanks.

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    3 replies

    J
    JDave.4Author
    Visitor II
    July 2, 2022

    Any idea?

    M
    Miroslav BATEK
    ST Employee
    July 10, 2022

    Hello, it is not clear what do you want to accomplish. What is your definition of the Phi-Theta-Psi and why you can't use roll and pitch.

    J
    JDave.4Author
    Visitor II
    July 12, 2022

    Hello,

    Indeed I would like to calculate the tilt angle for an inclinometer application.

    Please see the AN below:

    https://www.st.com/resource/en/application_note/an4509-tilt-measurement-using-a-lowg-3axis-accelerometer-stmicroelectronics.pdf

    Please see page 7 equation 6 and 7. But MotionDI output values at only one axis deviate from those when the sensor is tilted on both axes. How can I fix it?

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