Voron Resonance testing

 Based on https://www.klipper3d.org/Measuring_Resonances.html  (I used the pins pictured, not in the table)

ADXL345 pin	RPi pin	RPi pin name
3V3 (or VCC)	01/17	3.3v DC power
GND	06/25	Ground
CS	24	GPIO08 (SPI0_CE0_N)
SDO	21	GPIO09 (SPI0_MISO)
SDA	19	GPIO10 (SPI0_MOSI)
SCL	23	GPIO11 (SPI0_SCLK)

The accelerometer, while cheap, was difficult to wire.  The connection to the pi involves somewhat difficult to clamp wire.

If I did it again, I would use old USB3 cable.

The instructions are again a bit minimalist, I forgot to follow RPi Microcontroller document.

The key is to zero the klippy.log document, the reload.  Klippy.log usually has the errors.

cd /tmp

rm klippy.log

touch klippy.log

attempt to reload firmware, then 

cat klippy.log

to create the plots

find . -name 'calib*' -exec ~/klipper/scripts/calibrate_shaper.py {} -o {}.png \;