I come from an electronics background and am used to looking at a scope so
have always considered PWM as a digital control mode.  I'll take a look for
examples of how to set up a pwm pin in HAL.  My initial setup was done with
StepConf so I let it do all of the work to set up a spindle pwm pin.

Thanks.

Dave

On Fri, Aug 13, 2021 at 5:21 PM Ralph Stirling <
ralph.stirl...@wallawalla.edu> wrote:

> PWM *is* analog (0 to 1.0).  In hal, you would connect motion.analog_out
> (syntax likely wrong, going by memory) to a pwm value input.  That would
> feed the M67 value to your pwm.
>
> -- Ralph
>
> On Aug 13, 2021 2:09 PM, Dave Matthews <n36...@gmail.com> wrote:
> CAUTION: This email originated from outside the Walla Walla University
> email system.
>
>
> I saw a lot of references to using the M67 but couldn't see how it would
> apply as it is for analog outputs.  I thought that would be for something
> like the 0-10 volt spindle control.  I was looking at the M62 because I
> thought a PWM output would be considered a digital pin.  Am I looking at it
> wrong?  The laser is PWM between 0 and 5v.
>
> Dave
>
> On Fri, Aug 13, 2021 at 4:34 PM Todd Zuercher <to...@pgrahamdunn.com>
> wrote:
>
> > You might need to use M67 to set the PWM value and M62 to turn it on/off.
> >
> > Todd Zuercher
> > P. Graham Dunn Inc.
> > 630 Henry Street
> > Dalton, Ohio 44618
> > Phone:  (330)828-2105ext. 2031
> >
> > -----Original Message-----
> > From: Dave Matthews <n36...@gmail.com>
> > Sent: Friday, August 13, 2021 4:16 PM
> > To: Enhanced Machine Controller (EMC) <emc-users@lists.sourceforge.net>
> > Subject: [Emc-users] M62/M63 with a pwm output possible?
> >
> > [EXTERNAL EMAIL] Be sure links are safe.
> >
> > I recently started playing with lightburn and want to do photos.  Using
> > M3/M5 Sxxx for laser control works fine for following lines but not for
> > photos.  I think that I want to use M62 along with an Sxxx for laser on
> and
> > power setting.  The laser power is controlled by PWMing the on/off pin.
> >
> > Lightburn likes to use M106 and an S number for laser control.  I think
> it
> > is coming from M106 being used for fan on a Marlin 3d printer board.
> > Find/Replace M03 in place of the M106 sort of works but It does a laser
> > on, move, laser off so there is a lot of overburn.
> >
> > Sample gcode from Lightburn:
> > ; Image @ 2500 mm/min, 20% power
> > M8
> > M106 S0
> > G0X1.8487 Y0.8204 F0
> > ; Layer C01
> > M106 S0
> > G1X0.041 F98.425
> > M106 S20
> > G1X0.29
> > M106 S0
> > G1X0.041
> > M106 S0
> >
> > From the docs it looks like M62 would do the job if I can also use the
> > Sxxx to set the pwm.
> >
> > Questions
> >
> > - Is it possible to set up the digital pin associated with the M62 to be
> a
> > PWM output?
> > - Is there an example of how to do this?
> >
> > Dave
> >
> > _______________________________________________
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