prusa3d / prusa_laser_filament_sensor

PRUSA Laser filament sensor

Filament presence and velocity detection using a PAT9125EL optical laser movement sensor, operating at 850nm.

See also:

• PAT9125EL datasheet
• boucaron's investigation into this board

KiCad PCB layout

prusa_laser_filament_sensor's Issues

Add SPI pin and/or I2C select bridge

As Prusa is planning to have 5 filament runout sensors on the MK3 MMU wouldn't it make sense to:

• add a solder bridge from ID_SEL (pin 8 PAT9125EL) to GND and VDD (3 sensors could be active in I2C mode at the same time)
  • closed to VDD = HIGH I2C Slave ID (7-bit) 0x73
  • closed to GND = LOW I2C Slave ID (7-bit) 0x75
  • open = NC I2C Slave ID (7-bit) 0x79
• add additional PIN (ID_SEL) to the MMU stepper switch to use the PAT9125EL in SPI mode

Why don't use the MOTION pin 7 to detect "simple" motion?

No 3D models in repository

It would be nice to get a footprint library along with 3D models. At least, for PAT9125EL component.

Version 0.2 can get warm enought to melt plastic, should be removed from the repository!

Lots of people reported that the version 0.2 have melted PETG, this version should be removed from the repository. This might happen when there is a mechanical damage (like a bad removing of the filament with a big blob at the end).

https://shop.prusa3d.com/forum/general-discussion-announcements-and-releases-f69/be-aware-the-filament-sensor-almost-caught-fire--t24590.html
https://shop.prusa3d.com/forum/others-archive--f66/filament-sensor-just-burned-up--t14394.html
https://www.facebook.com/groups/prusacommunity/permalink/857264271280973/

Missing filter cap on LSF0102 Vref.

The 200k resistor from the datasheet is now included, but I think you are still missing a cap from vref to ground.
The data sheet says this (but doesn't recommend a specific cap value)
A filter capacitor on Vref_B is recommended.

Link to datasheet is no longer available

The link to the datasheet is no longer available, is it possible to provide a new link?