Error in Acceleration integration

[AnaRhisT94]

I'm getting the following error after moving the IMU:

python3 accel_integration.py
Starting Data Acquisition
Start Moving IMU...
Data Acquisition Stopped
Traceback (most recent call last):
  File "accel_integration.py", line 189, in <module>
    imu_integrator()
  File "accel_integration.py", line 128, in imu_integrator
    b_filt,a_filt = signal.butter(4,5,'low',fs=Fs_approx)
  File "/home/pi/imu_project/venv/lib/python3.7/site-packages/scipy/signal/filter_design.py", line 2957, in butter
    output=output, ftype='butter', fs=fs)
  File "/home/pi/imu_project/venv/lib/python3.7/site-packages/scipy/signal/filter_design.py", line 2423, in iirfilter
    "must be 0 < Wn < fs/2 (fs={} -> fs/2={})".format(fs, fs/2))
ValueError: Digital filter critical frequencies must be 0 < Wn < fs/2 (fs=6.0 -> fs/2=3.0)

Any idea why this happens?

[AnaRhisT94]

Solved it by turning off the magnetometer readings which slow my rpi zero. But still the integration fails. (posted in new issue)

[asciiscry3r]

Try to downgrade python libs

On Thu, Nov 4, 2021, 23:51 Ilan Aizelman @.***> wrote:

Solved it by turning off the magnetometer readings which slow my rpi zero. But still the integration fails.

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