Klipper - ADXL345 SKR MINI E3 v3.0

Different methods to connect ADXL345 to SKR MINI 3E v3

in your configuration file we add at the beginning of your configuration file comment out the [input_shaper] so there are no problems.

[include adxl345.cfg]

Depending on how you are going to connect it you have to comment or uncomment pertinent parts

SPI 1

pin row	pin row
1 - x	2 - x
3 - NSS	4 - CLK
5 - MOSI	6 - MISO
7 - 3.3v vcc	8 - GND

[adxl345]
cs_pin: PD9
spi_bus: spi1

---

I/O PORT

PD0	PD2	PD3	PD4	PD5
cs	scl	sda	sd0	x
NSS	CLK	MOSI	MISO	x

[adxl345]
cs_pin: PD0
spi_software_miso_pin: PD4
spi_software_sclk_pin: PD2
spi_software_mosi_pin: PD3

---

Pinout

G-Code Commands

1. command MEASURE_AXES_NOISE Should be somewhere in the range of ~1-100
2. TEST_RESONANCES AXIS=X
3. TEST_RESONANCES AXIS=Y
4. ~/klipper/scripts/calibrate_shaper.py /tmp/resonances_x_.csv -o /tmp/shaper_calibrate_x.png ~/klipper/scripts/calibrate_shaper.py /tmp/resonances_y_.csv -o /tmp/shaper_calibrate_y.png

---

ARDUINO as second MCU

pin sensor	pin arduino	arduino nano
CS	10/PB2	D10
SD0	12/PB4	D12
SDA	11/PB3	D11
SCL	13/PB5	D13
GND	GND	GND
VCC	3.3V	3.3v

Flashing

old version of avrdude:

1) `sudo nano /etc/apt/sources.list`
2) Add `deb http://raspbian.raspberrypi.org/raspbian/ buster main contrib non-free rpi`
3) Save and quit (`:wq`)
4) `sudo nano /etc/apt/preferences.d/avr-buster`
5) Type below and save file
    ```
    Package: avr-libc avrdud binutils-avr gcc-avr
    Pin: release n=buster
    Pin-Priority: 1001
    ```
6) Save and quit (`:wq`)
7) ```
    sudo apt update
    sudo apt install avr-libc avrdude binutils-avr gcc-avr
    cd ~/klipper
    make menuconfig
    ```
8) Change Micro-controller Architecture to ***Atmega AVR*** and Processor model to atmega<168|328|328p>
9) Press `q` and `y`
10) ````
    make clean
    make
    avrdude -patmega328p -c arduino  -b 57600 -P /dev/ttyUSB1 -v  -D -Uflash:w:out/klipper.elf.hex:i
    ```
    ***Note***: `/dev/ttyUSB1` may be different on your system and per printer primary MCU. Change any reference to match further ahead.
11) Once this is completed, nano will be ready to be used as a Second Klipper MCU

new version: ``` sudo sed -i '$ a\deb http://raspbian.raspberrypi.org/raspbian/ buster main contrib non-free rpi' /etc/apt/sources.list

echo -e "Package: avr-libc avrdude binutils-avr gcc-avr\nPin: release n=buster\nPin-Priority: 1001" | sudo tee /etc/apt/preferences.d/avr-buster > /dev/null

sudo apt update

sudo apt install avr-libc avrdude binutils-avr gcc-avr

avrdude -patmega328p -c arduino  -b 57600 -P /dev/ttyUSB1 -v  -D -Uflash:w:out/klipper.elf.hex:i
```

---

printer.cfg

Be sure to change serial address below as per output of 'ls /dev/serial/by-id/*'

[mcu arduino_nano_adxl]
serial: dev/serial/by-id/<usb-Arduino... | 1a86_USB2.0-Serial-if00-port0>

[adxl345]
cs_pin: arduino_nano_adxl:PB2

---

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