Firmware: “I have a new board and I’m using whatever it came with”…
So I have a fairly standard K40 machine (came with the % based readout - added a 30mA meter) and upgraded to the Laserboard within about a week of using it (K40Whisperer worked fine but wanted something more). Everything works as it should and have been happily cutting/engraving using the Lighburn Software; the bundle is excellent by the way.
As things go, projects and the like change and I have recently been looking into (also) doing some metal engraving for small to medium sized stainless & steel parts. I’ve tried the moly lube method and have gotten quite good results - but not exactly what I am after. I have a 450nm, 10W diode laser (was previously mounted to a CNC Mill) that I made a mount for and thought this would be an easy add-on for those few times when I want to engrave/label metal parts; simply set the offset for the second laser in the camera view and have at it. All seem to be fine, but the output from the Alternate PWM pins does seem to be what I expected it to be. Prior to blindly (pun not intended, but appreciated) attaching a laser and seeing if it works, I hooked up an oscilloscope to the PWM output pins and only got about a 5% duty cycle despite having the value at 80% in LightBurn. Changing the Max Power % for the layer does not change anything… just a 5kHz pulse.
Here’s the part I am perhaps somewhat confused with and would appreciate your feedback. As I keep the original CO2 laser installed but ‘turned off’ from the original built-in control board, does that have an effect? I would like to be able to use both lasers but preferably not at the same time… How should I go about this? All I need is a clean 5V PWM output that provides a duty cycle based on the setting in LightBurn, irrespective of whether the ‘Laser On’ button on the unit is enabled… otherwise I may need to add a switch in-line with the CO2 power source which I would like to avoid.
P.S. Also tried the L-Gnd approach and it just gives me a constant ~85% output.