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

sudo apt update
sudo apt install python3-numpy python3-matplotlib

cd ~/klipper/
sudo cp "./scripts/klipper-mcu-start.sh" /etc/init.d/klipper_mcu
sudo update-rc.d klipper_mcu defaults

cd ~/klipper/
make menuconfig

Configuration

sudo service klipper stop
make flash
sudo service klipper start

sudo raspi-config

Enable SPI

[mcu rpi]
serial: /tmp/klipper_host_mcu

[adxl345]
cs_pin: rpi:None

[resonance_tester]
accel_chip: adxl345
probe_points:
    117.5, 117.5, 20  # an example