Accelerometer Usage

Update Klipper

• Klipper supports the LIS3DH accelerometer as of November 13, 2024. If you need to use the LIS3DH accelerometer, you need to update Klipper.
• After connecting to the host computer via the network, enter the following code (update may fail due to network issues):

  cd ~/klipper 
  git pull

Add Configuration

#####################################################################
#                       LIS3DH Accelerometer Configuration (Enable if needed)
#####################################################################
[lis3dh]
cs_pin: SHT36:gpio9
spi_software_sclk_pin: SHT36:gpio10
spi_software_mosi_pin: SHT36:gpio11
spi_software_miso_pin: SHT36:gpio12

[resonance_tester]
accel_chip: lis3dh
probe_points:
    125, 125, 20  # Set this to the coordinates of the nozzle during resonance measurement

Usage Tutorial

Install Dependency Packages

warning

• The FLY host machine does not need to execute this, as it already comes with the accelerometer dependency package.
• Non-FLY host machines must execute this! It is recommended to use SSH tools such as MobaXterm_Personal for operation.

• Please execute the following commands sequentially to install the dependency packages.

• Please note that, depending on the CPU performance, it may take a lot of time, up to 10-20 minutes. Please wait patiently until installation is complete. In some cases, if the motherboard's RAM is too low, the installation may fail.

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

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

Test Accelerometer

• You need to home first before executing.
• Execute ACCELEROMETER_QUERY in the console.
• For multiple accelerometers, specify testing one by using ACCELEROMETER_QUERY CHIP=<ADXL>, where <ADXL> needs to be modified to the corresponding accelerometer name.
• If there is an error, please check the wiring and configuration.
• Normal output is shown below:
  
• This can then be used for resonance compensation measurement.

Calibrate Accelerometer

• Home first.
• Input SHAPER_CALIBRATE in the console, which will start automatic calibration for X and Y.
• After calibration is completed, execute SAVE_CONFIG to save the data.
• You can also use SHAPER_CALIBRATE AXIS=X to automatically calibrate one axis.
• The calibration process may take a long time, so please be patient.

tip

Attention! If the printer vibrates too violently during the test, please press the emergency stop immediately or send M112 to stop.

• A high accel_per_hz can make the vibration intense; you can appropriately reduce it.

  [resonance_tester]
  accel_per_hz: 50  # Default value is 75