Measure resonances with FLSUN ADXL

You can use FLSUN ADXL with FLSUN Speeder Pad for measuring Resonances via USB.

Needed:

• FLSUN ADXL
• USB cable

• Some dependencies are required to use this accelerometer, install them with this following commands (one at a time):

  sudo apt update
  

  sudo apt install python3-numpy python3-matplotlib libatlas-base-dev
  

• Followed by this command to install Numpy in Klipper's environment:

  ~/klippy-env/bin/pip install -v numpy
  

• If you have an error when installing Numpy, follow this steps, if not continue:

  Show / Hide

  
  

  • Enter the following commands (one at a time):

    sudo apt update
    

    sudo apt full-upgrade -y
    

    sudo apt install --reinstall python2* -y
    

    sudo service klipper stop
    

    cd ~ && mv klippy-env klippy-env.bak
    

    cd ~ && virtualenv -p python2 klippy-env
    

    cd ~/klippy-env
    

    bin/pip install -r ../klipper/scripts/klippy-requirements.txt
    

    ~/klippy-env/bin/pip install -v numpy
    

    sudo service klipper start
    

  • Numpy should install correctly.

• When it's done, plug FLSUN ADXL into one of the Speeder Pad's USB ports.

• Then, type this command to retrieve the serial:

  ls /dev/serial/by-id/*
  

• You should see 2 serials appear, one is your printer serial an other is the FLSUN ADXL, the one with the mention Klipper_stm32f103xe:

  

• Go to your Mainsail Web interface then click on Machine tab.

• Open adxl345_flsun.cfg file and edit following line with serial you have just obtained:

  serial: /dev/serial/by-id/usb-Klipper_stm32f103xe_A83331333634120136343231-if00
  

• Click on SAVE & RESTART at the top right to save the file.

• Then uncomment (remove the #) to the following line in the printer.cfg file to enable ADXL support:

  [include adxl345_flsun.cfg]
  

• Click on SAVE & RESTART at the top right to save the file.

• You should see the mcu adxl connecting to Klipper.

• You can test accelerometer by entering this command:

  ACCELEROMETER_QUERY
  

• Something like this must be returned:

  accelerometer values (x, y, z): 5551.544565, 7048.078582, -1924.535449
  

• Enter this command to measure the noise of the accelerometer for each axis:

  MEASURE_AXES_NOISE
  

• You should get some baseline numbers for the noise of accelerometer on the axes (should be somewhere in the range of ~1-100). Too high axes noise (e.g. 1000 and more) can be indicative of the sensor issues, problems with its power, or too noisy imbalanced fans.

• To measure the resonances on X axis run ADXL_AXE_X macro.

• To measure the resonances on Y axis run ADXL_AXE_Y macro.

⚠ If you encounter an error while measuring the resonances. Replace microsteps to 16 in printer.cfg file just for the duration of the test.

Note: After tests, it's better to disable the ADXL by commenting out the [include adxl345_pico.cfg] line again.

See more documentation here: Measuring Resonances | Klipper