Input shaping, accelerometer, and klipper

[Daniel Rosen]

I read some posts here about the greatness of adding input shaping. I successfully installed the USB BTT S2DW in my ender 3 and got all the data. Planning to do it in my voron and tenlog next. However, I don't fully understand how the axes map works. Is this axes map fine If the accelerometer is lying flat?. Thanks

The lis2dw.cfg file that I copy from github is as follows:

[mcu btt_lis2dw]

serial: /dev/serial/by-id/usb-Klipper_rp2040_btt_acc-if00

[lis2dw]
cs_pin: btt_lis2dw:gpio9
#spi_bus: spi1a
spi_software_sclk_pin: btt_lis2dw:gpio10
spi_software_mosi_pin: btt_lis2dw:gpio11
spi_software_miso_pin: btt_lis2dw:gpio8
axes_map: x,y,z

[resonance_tester]
probe_points: 100, 100, 20
accel_chip: lis2dw

[Ed Street]

Grats on the upgrade.  
There are several gotchas with the graph and many things to look for.  This covers much, but not all of those.   https://klipper.discourse.group/t/interpreting-the-input-shaper-graphs/9879

Also, don't give up on it.  This is a very complex, very detailed thing.

[Daniel Rosen]

Thanks Ed. this is useful information and will go through it in detail. I glanced it and there is no mention about how to match the accelerometer position with the axes map. 

[Ian Nicholson]

I'm hoping you've already gotten past this part, but here's what Klipper's manual says about mounting the accelerometer:

https://www.klipper3d.org/Measuring_Resonances.html#mounting-the-accelerometer

From what I've seen you don't need to map the axes specifically, unless you want the graph to be explicitly correct.