Bambu lab release new the A1 mini, using hotend pressure.
I think this is light enough on the MCU

bambulab a1 mini measure Inductance for pressure advanced auto calibration
Prusa mk4‘s hardware can do same thing.
I’m interested in how they do auto Pressure Advanced
without computer vision

Using string gauge and AD620 for z probe. I think RP2040 has enough sram to do it

More details for auto pa, still need more data from hotend pressure.
https://forum.duet3d.com/topic/33667/auto-pressure-advance-turning-by-hotend-pressure

@nikscha Here is a post about sampling speed
https://forum.duet3d.com/post/251488

Change Pressure advance according to speed.
https://github.com/SoftFever/OrcaSlicer/pull/5609

igiannakas opened this pull request in SoftFever/OrcaSlicer

closed Enhancement: Adaptive Pressure advance #5609

@gloomyandy For example, the Protocol 2.0 used by DYNAMIXEL XL330-M288-T, PWM servos cannot be used for torque control and speed control. Two-way communication can be used not only for servos maybe digital sensors or other non-real-time device control.

@droftarts Hope it can be used on Expansion boards. The serial bus servo can be connected to IO 0 of 1LC.

Improve servo motor scalability, position, speed, and torque support
Perhaps it can be controlled by commands similar to M260

Bambu Lab may also use a similar algorithm to achieve flow calibration.
https://forum.duet3d.com/topic/33667/auto-pressure-advance-turning-by-hotend-pressure/28?_=1716527681549

I checked the code and it is consistent with your guess. Automatic calibration uses DFT to determine frequency and amplitude, and the golden section search algorithm iterates.
Without developers have no chance.

@penguinya Just early version, I think it is ok.

@Charlie According to the simulation results, the impact on printing is unobservable.
Aluminum 6061, 100N force

@Charlie https://help.prusa3d.com/article/stuck-filament-detection-13101-mk4-21101-mk3-9-17108-xl_690089

Just an updating.