A simple snap-on case for an RP2040-based accelerometer module for Klipper, using an ADXL345 and a Pimoroni Tiny 2040.
The models folder includes a little soldering jig to hold both boards together in approximately the same position as the case.
This was first outlined in this Klipper forum post.
cd ~/klipper/
make menuconfig # select RP2040 as target
make
# Connect the Pico via USB while holding down BOOT
sudo mount /dev/sda1 /mnt
sudo cp out/klipper.uf2 /mnt
sudo umount /mnt
# This should trigger a reboot and you should see a new serial port
ls -al /dev/serial/by-id/*Add this configuration to your printer.cfg (I use an include directive, so I can comment it out when not having the accelerometer plugged in)
[mcu pico]
serial: /dev/serial/by-id/usb-Klipper_rp2040_mySerial
[adxl345]
spi_bus: spi0a
cs_pin: pico:gpio1
[resonance_tester]
accel_chip: adxl345
probe_points:
100,100,20 # an example