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ADXL345 g formula

Question asked by RobertoCarlos on Jul 24, 2013
Latest reply on Jul 25, 2013 by RobertoCarlos

Hi

 

I have an ADLX 345 conected to the new Arduino DUE, and I would like to check if its the correct formula for real g acceleration:

 

Areal = ( Ameas - Offset)* Scaling factor

 

where

 

Areal is the actual acceleration in g units

Ameas is the raw acceleration measured (after 2´s complement combination procedure)

Offset is the offset calculated for each axis

and Scaling factor is dependant on resolution and g range

 

so, for an measure with +-16 g on full range (13 bits) the sclaling factor is 0,0039 g thus the equation is

 

Areal = (Ameas - Offset)*0,0039    (g)

 

Is that correct?

 

Thanks

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