I'm also an EE. Class D audio amplifiers are filtered PWM. A motor inductance also filters pwm to an analog value. Your laser modulation input likely low pass filters the pwm as well.
-- Ralph On Aug 13, 2021 2:25 PM, Dave Matthews <n36...@gmail.com> wrote: CAUTION: This email originated from outside the Walla Walla University email system. 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 > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > > https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=04%7C01%7Cralph.stirling%40wallawalla.edu%7Cc049983552324009948d08d95ea0e3c7%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637644867391671331%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=BlMQs4lcF0qlyREAutYk9V18ssqfk0ecl3nS24iuDVg%3D&reserved=0 > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > > https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=04%7C01%7Cralph.stirling%40wallawalla.edu%7Cc049983552324009948d08d95ea0e3c7%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637644867391681328%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=wlHYwF2Kum9DJ3dgfxlzZN8ZO3TgIW3pyF7FkfSKjQo%3D&reserved=0 > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > > https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=04%7C01%7Cralph.stirling%40wallawalla.edu%7Cc049983552324009948d08d95ea0e3c7%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637644867391681328%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=wlHYwF2Kum9DJ3dgfxlzZN8ZO3TgIW3pyF7FkfSKjQo%3D&reserved=0 > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=04%7C01%7Cralph.stirling%40wallawalla.edu%7Cc049983552324009948d08d95ea0e3c7%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637644867391681328%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=wlHYwF2Kum9DJ3dgfxlzZN8ZO3TgIW3pyF7FkfSKjQo%3D&reserved=0 > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=04%7C01%7Cralph.stirling%40wallawalla.edu%7Cc049983552324009948d08d95ea0e3c7%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637644867391681328%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=wlHYwF2Kum9DJ3dgfxlzZN8ZO3TgIW3pyF7FkfSKjQo%3D&reserved=0 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
