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Detecting Motor start up time from Accelerometer ADXL330

Hi Everyone,

 

    I have a simple program that reads the input of an accelerometer ADXL330 (specifically just one axis, the Z-axis) and plots the values to a chart and records the values in a table.

Subsequently, I have a DC Eccentric rotating mass (ERM) disk motor that I manually turn on with a 5Volt power source and would like to detect the time it took for the motor to turn on using the accelerometer.

 

   What I built in Labview is a crude attempt at this, but unforunately the table values seem to suggest a resolution of only 2.5ms between samples acquired from the accelerometer. I'm sure the specs for this particularly acclerometer is around 500Hz frequency sampling, so I am confused if the code is slowing down, or something is off between the data points I should be receiving back and what I am seeing.

 

   Would anyone be able to comment on this?

 

Thanks a lot!

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