Measure resonances with Raspberry Pi Pico - Guilouz/Klipper-Flsun-Speeder-Pad GitHub Wiki

You can use ADXL345 with FLSUN Speeder Pad for measuring Resonances via USB with a Raspberry Pi Pico.

Needed:

Wiring:

Some dependencies are required to use ADXL345, install them with this following commands (one at a time):
```
sudo apt update
```
```
sudo apt install python3-numpy python3-matplotlib libatlas-base-dev libopenblas-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

It's also necessary to compile firmware for Raspberry Pico, enter the following commands (one at a time):
```
cd ~/klipper/
```
```
make menuconfig
```
Select these settings:
Then on your keyboard press the Q key then Y to save configuration.
Enter the following commands to compile firmware (one at a time):
```
make clean
```
```
make
```
Plug Raspberry Pi Pico into one of the Speeder Pad's USB ports while holding down the BOOTSEL button.

Type this commands to flash firmware (one at a time):

cd ~ && sudo mount /dev/sda1 /mnt

sudo cp /home/pi/klipper/out/klipper.uf2 /mnt/

Now disconnect and reconnect the accelerometer, without holding the BOOTSEL button this time to restart it in normal mode.
Then, type this command to retrieve the serial:
```
cd ~ && ls /dev/serial/by-id/*
```
You should see 2 serials appear, one is your printer serial an other is the Raspberry Pi Pico, the one with the mention Klipper Rp2040:
Go to your Mainsail Web interface then click on Machine tab.
Open adxl345_pico.cfg file and edit following line with serial you have just obtained:
```
serial: /dev/serial/by-id/usb-Klipper_rp2040_E6605481DB318D34-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_pico.cfg]
```
Click on SAVE & RESTART at the top right to save the file.
You should see the ADXL MCU 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.