Driving a laser via PWM I would like to switch on and off a laser via the fan speed control "M106 S***" gcode. What pin does the arduino use to signal the mosfet connected to D9? Much thanks in advance. https://reprap.org/forum/read.php?219,489970,489970#msg-489970 Wed, 22 Apr 2026 00:29:04 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?219,489970,492955#msg-492955 Re: Driving a laser via PWM https://reprap.org/forum/read.php?219,489970,492955#msg-492955
My setup is very simple: I have an LED connected between the arduinos digital 9 pin and the ground pin. When I issue the M106 gcode, the arduino and LED stay on, but, about a quarter of the time, the USB connection is broken. What gives?]]> Anonymous User RAMPS Electronics Sun, 05 Apr 2015 01:43:32 -0400 https://reprap.org/forum/read.php?219,489970,491100#msg-491100 Re: Driving a laser via PWM https://reprap.org/forum/read.php?219,489970,491100#msg-491100 Anonymous User RAMPS Electronics Tue, 31 Mar 2015 14:03:57 -0400 https://reprap.org/forum/read.php?219,489970,490503#msg-490503 Re: Driving a laser via PWM https://reprap.org/forum/read.php?219,489970,490503#msg-490503
Quote
3Derping
What pin does the arduino use to signal the mosfet connected to D9?
D9 stands for Digital 9, so pin 9. Pretty creative with their naming, huh? :)


You should be able to use M42 Px Sy where x is the pin number (9 in your case) and y is the PWM value 0-255.]]> cdru RAMPS Electronics Mon, 30 Mar 2015 09:49:29 -0400 https://reprap.org/forum/read.php?219,489970,489970#msg-489970 Driving a laser via PWM https://reprap.org/forum/read.php?219,489970,489970#msg-489970
Much thanks in advance.]]> Anonymous User RAMPS Electronics Sat, 28 Mar 2015 23:59:02 -0400