Installed a Creativity 3D Printer Filament Sendor module. Doesn't seem to work.
The Ender 3 Pro motherboard has a connection for the sensor, but I do not have the skills needed to modify the operating system (Marlin 126.96.36.199) to get it to work.
ALSO tried connecting it to three GPIOs on my OctoPrint Pi, but that also did not work. Used GPIO 17 for the red wire, 18 for the white wire, and 20 for the black wire from the sensor. Not sure the pin to wire colot is connect.
Also added "Plugins:", (2 spaces) Filament:, (4 spaces) Pin 17, (4 spaces) bounce: 00, each on their own line, to config.txt. Also tried to install the OctoPrint Filament Plug-Ins, but it always fails.
Installed sensor to motherboard, then a second time tried connection to OctoPrint Pi 3b.
Have not tried safe mode, not sure that would help
You can download this in OctoPrint's System Information dialog ... no bundle, no support!)
OctoPrint version, OctoPi version, printer, firmware, browser, operating system, ... as much data as possible
OctoPrint v1.7.3 on a Pi3b
Printer is an Ender 3 Pro, version Marlin 188.8.131.52.