Laser Filament Monitor 'SW' PCB Pads & Inner Chamber Color



  • Hi,

    I got Duet's newly released laser filament monitor a while back but only now starting to look into hooking it up in my rig & I have the following questions which I'm hoping to get some info on:

    (1) on the sensor's PCB there are a couple of round pads marked 'SW'. Looking at the schematics they seem to me to be intended for connecting an external reset switch - is this correct? and if so, has anyone utilized this feature? How useful is it to have?

    (2) What would be the best background color (if any) for the inner chamber where the sensor's 'camera' chip is located (i.e. where the filament runs and inspected by the chip)? does the color even make a difference in this context?

    Many thanks in advance.
    SnowCrash


  • administrators

    1. It's for an optional filament presence switch.

    2. It must be printed in black.



  • @dc42 said in Laser Filament Monitor 'SW' PCB Pads & Inner Chamber Color:

    1. It's for an optional filament presence switch.

    Thanks for the very quick response, @dc42!

    Could you please elaborate on what 'an optional filament presence switch' is and what it does?


  • administrators

    A filament presence switch is a simple switch that tells the sensor whether filament is present or not. So it can tell the Duet instantly when a spool runs out. But it's not really needed, because the end of the filament will pass through the filament monitor, which should detect loss of motion before the end reaches the extruder drive.



  • @dc42 said in Laser Filament Monitor 'SW' PCB Pads & Inner Chamber Color:

    A filament presence switch is a simple switch that tells the sensor whether filament is present or not. So it can tell the Duet instantly when a spool runs out. But it's not really needed, because the end of the filament will pass through the filament monitor, which should detect loss of motion before the end reaches the extruder drive.

    So the voltage across these pads alternates between High & Low on the basis of filament presence regardless of the main signal from the monitor module? does this functionality exist out-of-the-box or are tweaks needed?


  • administrators

    You need to change the filament monitor type in the M591 command to enable the filament presence switch.


 

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