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Problems of drift with ADXL345

Question asked by DanieleG on Jan 25, 2013
Latest reply on Apr 27, 2016 by NevadaMark

Hi all.

I'm using an ADXL345 for a shock detector and acceleration logger, but I have problems with the values returned by the sensor.

The system stores a value every 10 seconds by making a averaging of 32 readings. The ODR is 400 Hz.
As you can see from the chart that I enclose, I experience a periodic drift of the reading of which I can not understand the cause.

In the graph, Serie3 is the Z axis, Serie2 Y and Serie1 X. The top mean value of Z is around 1.07 g.

The sensor, of course, has been positioned at rest on the floor.
What do you think could be the cause of this behavior?