Klipper + ADXL345 Input Shaper guide: Difference between revisions

Revision as of 10:43, 27 November 2021

Guide

Aquire an ADXL345
Solder 6 wires on to the ADXL345.
Monut the ADXL to you Extruder. If you got a moving printbed as X you need to move the ADXL345 halfway into the calibration guide. Watch NEROs video!
Connect the 6 wires to your Raspberry Pi - DO it correct please or you COULD risk frying either your ADXL345, Your Raspberry Pi... or both ;-)
Install the software - if you havent done so already.
Update your Raspberry Pi:
sudo apt update -y
sudo apt upgrade -y
Install "numpy" - Note: this will take quite some time - NERO says 20 minutes. It was faster on my Raspberry Pi 4 but still...
~/klippy-env/bin/pip install -v numpy
Install additional dependencies
sudo apt install python-numpy python-matplotlib
Configure your Raspberry Pi as a secondary MCU - Note: I got this working together with screen on my Creality Ender 5 Plus :-)
sudo cp ~/klipper/scripts/klipper-mcu-start.sh /etc/init.d/klipper_mcu
sudo update-rc.d klipper_mcu defaults
Rebuild the microcontroller code:
cd ~/klipper/
make menuconfig
Select "Micro-controller Architecture (Linux process)"
Select "(X) Linux process" - make sure the X is set.
Press Q
Respond Yes to save changes.
Stop the klipper service:
sudo service klipper stop
Build and flash the new code to the microcontroller.
make flash
Start the klipper service again.
sudo service klipper start
Make sure the Linux SPI driver is enabled:
sudo raspi-config
Select "3 Interface Options"
Select "P4 SPI"
Respond Yes to the question "Would you like the SPI interface to be enabled?"
Respond Ok to the information that "The SPI interface is enabled"
Press TAB twice to mark the "Finish" button.
Press Enter.
Open your klipper configuration file in your favorite linux text-editor. I use nano.
nano ~/printer.cfg
copy the Additional lines below.
paste the Additional lines into your klipper configuration file above the [mcu] section.
Save the changes in the klipper configuration file.
Exit the texteditor.
Issue the "restart" command in your klipper terminal window - I use OctoPrint for this.
Software is now fully installed and configured.
Test if the ADXL345 is recognised and talking with Klipper.
Issue the "ACCELEROMETER_QUERY" command in your klipper terminal window - I use OctoPrint for this.
You should get a resonse that looks like this:
Recv: // adxl345 values (x, y, z): 611.934960, 305.967480, 11473.780500

Additional lines

[mcu rpi]
serial: /tmp/klipper_host_mcu

[adxl345]
cs_pin: rpi:None

[resonance_tester]
accel_chip: adxl345
probe_points:
    150,150,20  # an example

Credits

I wrote this guide using NERO 3Ds Youtube video as inspiration, so I hade the commands needed handy to cut'n paste into my Raspberry Pi when ever I want to rerun the calibration.

@@ Line 38: / Line 38: @@
 # Open your klipper configuration file in your favorite linux text-editor. I use nano.
 # <blockquote><code>nano ~/printer.cfg</code></blockquote>
+# copy the ''Additional lines'' below.
+# paste the ''Additional lines'' into your klipper configuration file above the [mcu] section.
+# Save the changes in the klipper configuration file.
+# Exit the texteditor.
+# Issue the "restart" command in your klipper terminal window - I use OctoPrint for this.
+# Software is now fully installed and configured.
+# Test if the ADXL345 is recognised and talking with Klipper.
+# Issue the "ACCELEROMETER_QUERY" command in your klipper terminal window - I use OctoPrint for this.
+# You should get a resonse that looks like this:
+# <blockquote><code>Recv: // adxl345 values (x, y, z): 611.934960, 305.967480, 11473.780500</code></blockquote>
 #
 #
@@ Line 46: / Line 56: @@
 #
 #
+#
+#
+#
+#
+#
+#
+#
+==== Additional lines ====
 <pre>
 [mcu rpi]