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IndustryArena Forum > Laser Engraving and Cutting Machines > General Laser Engraving / Cutting Machine Discussion > Question about PWM - do I need it to control my NEJE 30W laser
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  1. #1
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    Question about PWM - do I need it to control my NEJE 30W laser

    I'm in the final stages of a build for a laser engraver. Right now I'm using an Arduino Uno r3 with a Protoneer CNC Shield to control motion. The CNC Shield has outputs for Spindle Enable and Direction, but I don't see anything for PWM control. My question is, do I need PWM control for the laser to control the power. If I do, any recommendation for a controller board that will fill the bill? I am totally new to laser technology, so please go easy on me. I don't know if i am leaving out any pertinent information, so please ask questions and I'll do my bet to answer them. I was planning to use LaserGRBL, but would be open to using other software if it would be better suited to my hardware. Lightburn or...
    Thanks,
    Joe Melhorn
    Sahuarita, AZ

  2. #2
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    Apr 2005
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    Cool Re: Question about PWM - do I need it to control my NEJE 30W laser

    I guess that you need PWM for laser power control.
    To be able to control power, parameter $32 should be set to 1 ($32=1) - Laser mode ON

    PWM output is available at the circled pins.

    Click image for larger version. 

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