IR Filament monitor
kroybal last edited by kroybal
I have been having issues with the IR filament monitor. For my printer's setup, the sensor is enclosed in an SLA printed opaque part with silicone gasketing to prevent light leaks. However, my sensor will flicker a persistent green even when there is no motion. I have had to disable FM for the past month due to the boards inconsistencies. This has persisted even after cleaning the sensor with air, and a gentle dusting with a PEC Pad ensuring the sensor is clear of dust/debris.
How does the board handle its signal output? Is it some square wave PWM signal that's producing some (I say this arbitrarily) 50% DC as its high/motion detected state and 25% low/no motion? I am trying to read into the led flickering and make sense of what is occurring behind the signal its providing to the board.
My DWC reports back over extrusion print paused and in other cases, I have experienced under extrusion where the behavior of the LED color indications: R R R R .... G
during phases of constant filament feeds.
There are parameters I can dial in such as reference length which I would imagine takes some delta of the signal output and converts signal into a length of motion required to produce the trace. I just don't see this helping my case, because I believe it is at a hardware level and not a software level.
I am digging deep into the PCB circuitry logic at this point, but I have done so because I feel like I have exhausted many of my fixes.
Which filament monitor exactly is this? The Duet Laser Monitor?
Which version? How is it configured? Calibrated?