makerportal/mpu92-calibration

Error in Acceleration integration

AnaRhisT94 opened this issue · 2 comments

AnaRhisT94 commented

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 commented

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

asciiscry3r commented