I have been working on a co2 laser cutter and its now about time to start testing it. Its running off of an arduino uno and a cnc shield with grbl and that works fine with the total of 3 nema 17 motors(1x, 2y). Now i want to connect the co2 laser. The power supply I have will take a pwm input but i am not quite sure how to do that with the uno+shield. Also, what free software is there that i could use? Here are the links to what I have: arduino + shield- Arduino CNC Kit w/ UNO + Shield+ Stepper motors DRV8825 Endstop GRBL laser power supply- 50W CO2 MYJG Series Power Supply (Green Shell) MYJG-50W 110/220V I don't have very much experience with arduino so any help would be greatly appreciated.