BTT SFS 2.0 with Leviathan Mainboard

[Schredi]

Hello Guys. I just Wonder if the Leviathan Mainboard that comes with the LDO Kits is compatible with the BigTreeTech Smart Filament Sensor 2.0. I cant get it Runing I tried using the Filament Sensor PIN PF0 and the Fan 3 PIN PC9. And it didnt worked. 

Leviathan Pinout: https://ldomotion.com/p/guide/VORON-Leviathan-V13

SFS V2.0 User Manual_20231123.pdf

[jetcat]

This is config script I use with my Leviathan. Using PC0 and PC1.

 

[filament_switch_sensor switch_sensor]  
switch_pin: PC0
pause_on_runout: False
runout_gcode: 
        PAUSE          # [pause_resume] is required in printer.cfg  
        M118 Filament switch runout 
insert_gcode: 
        M118 Filament switch inserted
        
[filament_motion_sensor encoder_sensor]  
switch_pin: PC1
detection_length: 14.4 # accuracy of motion sensor 2.88mm
pause_on_runout: False
extruder: extruder
runout_gcode: 
        PAUSE          # [pause_resume] is required in printer.cfg 
        M118 Filament encoder runout 
insert_gcode: 
        M118 Filament encoder inserted 

[Schredi]

Did you Wire the Red and Blue Cable to PC0 and the Black and Green to PC1?

[jetcat]

I used the +5v and gnd on the neopixel output since I didn't use it and the signals to PC0 and PC1 (or any unused end stop). I think the 3.3V output is too low.  Even the 5V out is only 4.5V on the Leviathan board because of a diode drop.

[Nitrooxyde]

 

Small data point for future readers on the voltage side: the SFS 2.0 is

officially rated **3.3–5 V** (BTT manual, p.5 — the "5V" in their wiring

diagrams is just because the example boards are 5V-tolerant STM32s). Mine runs

fine on a clean, regulated 3.3 V — so if it doesn't work from a board's 3.3 V

pin, it's likely that rail sagging under load rather than the sensor needing 5 V.

 

Alternative approach if someone prefers to skip board pins entirely: I run mine

from a $3 RP2040-Zero flashed as a Klipper USB MCU (sensor powered by the pico's

3V3, one USB cable to the Pi). Write-up + printed mount here if it can help:

https://github.com/Nitrooxyde/BTT-SFS-2.0-RP2040-Zero-Klipper