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

JDave.4
Associate III

‎2022-06-30 09:27 AM

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 3
JDave.4
Associate III

‎2022-07-02 01:24 AM

Any idea?

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Miroslav BATEK
ST Employee

‎2022-07-10 09:34 AM

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.

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JDave.4
Associate III

‎2022-07-12 05:54 AM

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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