I've been working on a delta based CO2 laser cutter. I need help finding the PWM pin that normally controls the printhead fan speed (D9). I would like to use this to control my laser's power by issuing M106 SXXX to my RAMPS 1.4 board. So far, I have been able to upload the basic "Fade" arduino sketch to my stand alone arduino. Once I connect the laser to the appropriate PWM pin, it responds just like an LED would (fading in and out). This tells me my other circuitry is good. All I have to do now is find the right pin the arduino and connect to that, correct? What pin does marlin + ramps use to control D9? https://reprap.org/forum/read.php?133,489633,489633#msg-489633 Fri, 11 Sep 2026 13:08:09 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?133,489633,491173#msg-491173 https://reprap.org/forum/read.php?133,489633,491173#msg-491173 forums.reprap.org]]]> SergioMC Laser Cutter Working Group Tue, 31 Mar 2015 16:27:58 -0400 https://reprap.org/forum/read.php?133,489633,489633#msg-489633 https://reprap.org/forum/read.php?133,489633,489633#msg-489633 So far, I have been able to upload the basic "Fade" arduino sketch to my stand alone arduino. Once I connect the laser to the appropriate PWM pin, it responds just like an LED would (fading in and out). This tells me my other circuitry is good. All I have to do now is find the right pin the arduino and connect to that, correct?

What pin does marlin + ramps use to control D9?]]> dudesom Laser Cutter Working Group Sat, 28 Mar 2015 06:52:32 -0400