Question

Which of the formulae give us the angle of inclination in the ADXL-335?

(a) theta=atan(X_Value/sqrt((Y_Value*Y_Value)+(Z_Value*Z_Value)))

(b) theta=atan(X_Value/sqrt((Y_Value*Y_Value)*(Z_Value*Z_Value)))

(c) theta=atan(X_Value/sqrt((Y_Value)+(Z_Value*Z_Value)))

(d) theta=atan(X_Value/sqrt((Y_Value*Y_Value)+(Z_Value)))

I have been asked this question in an online quiz.

The above asked question is from ADXL335 Accelerometer Sensor in portion Interfacing of Sensors, Actuators, and Other Modules of Arduino

Answer 1

Right option is (a) theta=atan(X_Value/sqrt((Y_Value*Y_Value)+(Z_Value*Z_Value)))

For explanation I would say: atan(X_Value/sqrt((Y_Value*Y_Value)+(Z_Value*Z_Value))) gives the correct value of the angle of inclination of the accelerometer module. Here all the three values read from the 3 data pins of the ADXL-335 module are to be replaced in the equation at the same time in order for this to work.