How to find 'g' from a MEM's Device (Shimmer IMU)?

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SUMMARY

The discussion focuses on calculating 'g' from accelerometer readings obtained from the Shimmer IMU device. Users reported values between 1000 and 2000, which are likely outputs from the ADC. To accurately determine 'g', it is recommended to calibrate the accelerometer using Earth's gravity by aligning it vertically for a reading of 9.8 m/s² and horizontally for a reading of 0 m/s². This calibration process can enhance the accuracy of the readings by establishing a linear relationship between voltage output and acceleration.

PREREQUISITES
  • Understanding of accelerometer principles and operation
  • Familiarity with Shimmer IMU specifications
  • Knowledge of ADC (Analog-to-Digital Converter) output interpretation
  • Basic skills in data analysis using Excel or similar tools
NEXT STEPS
  • Research Shimmer IMU calibration techniques
  • Learn about linear regression for data fitting
  • Explore ADC output characteristics and conversion methods
  • Investigate accelerometer datasheets for specific models
USEFUL FOR

Engineers, researchers, and hobbyists working with motion detection and accelerometer data analysis, particularly those using the Shimmer IMU device.

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Hello all,
I'm working with an accelerometer to detect movement and I'm using Shimmer IMU. I got values ranging somewhere between 1000 and 2000. My question is, are these values the output of the ADC? And how do i calculate 'g' from the values?
I have attached an xls file with the experiment readings.
Thank you
 

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The device must have some documentation with it. Which should explain what those values are.
 
Probably the easiest way would be to just calibrate it using Earth's gravity - most accelerometers output voltage is linearly proportional to the acceleration, so all you need is two points to calibrate it. If you hold it vertically, such that the measurement axis is aligned with the gravitational force, you can get one such calibration point (9.8 m/s^2), and then you can get the second calibration point by holding it horizontally (0 m/s^2) or upside down (-9.8 m/s^2). You could even do all three, and then do a best fit line to determine a slightly more accurate reading.

Alternatively, there's probably a spec sheet somewhere, but how useful it is will depend on your setup.
 

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