5 years, 4 months ago.

How to calculate angle by accelerometer readings?

Hi, I am working on a project with ADXL313. My goal is to convert the accelerometers into an angle. Previously I used the formula as --

FltAlgX = asin(X[0]/65536.0f)*Rad2Deg; FltAlgY = acos(Y[0]/65536.0f)*Rad2Deg; FltAlgZ = asin(Z[0]/65536.0f)*Rad2Deg;

(Rad2Deg=180.0f/3.141592f & dividing by 65536 is to get the value in mg form not mg/LSB). I came to know that this formula is wrong. When I googled for another formula I got a number of different formulas to get angle like somewhere it's given like Ax=arctan(X/sqrt(Y^2+Z^2)) Ay=arctan(Y/sqrt(X^2+Z^2)) Az=arctan(Z/sqrt(X^2+Y^2))

So finally, I am totally confused that what the exact formula we should take to calculate the angle from accelerometer readings. Please help me to come out from this confusing scenario.

Thanks