Engrave Photos with PWM Laser

edited May 8 in Tips & Tricks
Hi,
is there anyone experienced in engraving photos with PWM Laser?
just need some setups regarding grayscales as i´m not really satisfied with my results.

I use PLTB450 B 1.6W Blue Laser Diode with PWM capable driver controlled by 12 Bit PWM at 1KHz

Thanks

Comments

  • edited August 10
    I've try to engrave some photo but without a real good result..
    See the photo on the end of the blog article...
    http://www.e-tips.it/2017/03/20/incisore-laser/


    Seems that for a gray-scale you have to drive the laser with a higher PWM frequency...
    but in repetier-firmware, if you change the PWM frequency then it will decrease the resolution of the pwm, so you have less duty cycle value, so you cannot have a good result...

    Edit.
    I will add a question...
    In the repetier, the PWM frequency is fixed?
    If the frequency is made by the hardware peripherals and it is a fixed frequency, i will try to increase it with a micro-controller programmed for multiply the frequency...

  • there is a solution out of the box , see
    https://github.com/repetier/Repetier-Firmware/tree/development/src/SampleEventSystems/Laser PWM and DAC

    I´ll post some pictures to my GitHub  to show some pretty good results.
    (may take a cuple of days)





  • edited August 11

    RAyWB said:
    there is a solution out of the box , see
    https://github.com/repetier/Repetier-Firmware/tree/development/src/SampleEventSystems/Laser PWM and DAC

    I´ll post some pictures to my GitHub  to show some pretty good results.
    (may take a cuple of days)





    Great! Fantastic work!
    I've ordered two PCA9685 board and two solid state relay (i've got to machine).
    I will tell you the result as soon i receive the parcel :)

    Great work also with the fix:
    Warmup for laser included (to avoid gaps in engraving)

    I've downloaded your firmware and i will configure and try it ;)

    Edit:
    Ops, i've got the MEGA..
  • edited August 11
    I have it running on a mega/ramps also.

    use dev firmware and add the custom events , warmup and most other features are included in official repetier-firmware
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