I have added a third axis to the spectrum analyzer. The atMega328 (Arduino Nano) program is adxl335_3can_01_en.c. The Python 2.7 program is fft_spectrum_gui_3can.py.
I also made a version of the three axis analyzer that works with
Python 3.5, fft_spectrum_gui_3can_py3_01.py.
There is also a file with sampled
data for testing purposes datos_3can_20-12-2016__11_39_50.txt.
Works with both versions of the 3 axis FFT analyzer.
Notice that the accelerometer Z axis is limited to 500 Hz.
This files are also available on GitHub at
The screen shot is shown below.