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Strange readings from ADXL345

Question asked by Nonimo on Jul 30, 2015
Latest reply on Aug 14, 2015 by neilzhao

I use ADXL345 for shock/acceleration measurement. I use Adafruit's breakboard connected to Raspberry Pi B+. For acquiring data I use program written on Python. This program request data from accelerometer about 10 times a second and write it into text logfile. However, it shows me strange result. Here is on graph (X axis is time of day, Y axis is acceleration in G) I see strange fluctuations. I can't explain such behavior. Could anyone help me to explain it please? Thank you!

20150721.jpg

Here is graph with similar fluctuations, one spike is proof that sensor works, I just shook it.

20150723.jpg

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