Accelerometer total not equal to 1

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SUMMARY

The total output of an accelerometer in a static position should theoretically equal 1 g, but variations occur based on device positioning. Users have reported discrepancies where the calculated total, derived from the square root of the sum of the squares of the axis readings, does not equal 1. This inconsistency suggests potential calibration issues or environmental factors affecting readings. To achieve consistent totals across different static positions, further investigation into calibration techniques and environmental influences is necessary.

PREREQUISITES
  • Understanding of accelerometer principles and 3D motion sensing
  • Familiarity with the mathematical concept of the square root of the sum of the squares
  • Experience with data normalization techniques
  • Knowledge of calibration methods for sensors
NEXT STEPS
  • Research accelerometer calibration techniques for consistent readings
  • Explore methods for data normalization in sensor outputs
  • Learn about environmental factors affecting accelerometer accuracy
  • Investigate advanced mathematical concepts related to sensor data analysis
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Engineers, data scientists, and developers working with motion sensors, particularly those involved in robotics, mobile devices, and wearable technology.

mark2468
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Hi.

The theoretical total of accelerometer output when in a static position is equal to 1 g. However I get a different result depending on where the device is positioned. Some is greated than 1, some is less.

What I have done is determine the max value for each axis and divide all readings of a particular axis by the max for that axis. e.g:

Zmax = 1.14 and so all Z values are divided by 1.14.

I have done this for all three axis but the total is still not equal to 1. If there was a slight offset I could live with this, but it is different for all static positions.

Is there a way of getting the totals being the same for all positions in the 3d plane?

Mark.
 
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The total shouldn't be one. It's the square root of the sum of the squares that should be 1. Assuming no other accelerations.

And why do you start a new thread for every question with your accelerometer? Can't you keep it all in one thread? I guarantee you'd get better answers that way.
 
sorry, am new to forums.

I meant the total being the square root of the sum of the squares. This is not equal to 1, and the difference is not the same at each reading. If it was I could easily remove it.

Is this common and is there a way to correct it.
 

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