Variable Spindle PWM in GRBL 0.9

I want to help even works Variable Spindle PWM in GRBL 0.9
Connect the wire to the pin No. 11 and the second wire to the ground
And try to run it with with m03 and m05 commands
So what are the steps to do I even worked out where I am a novice in this area

I have 300W Quiet Cut spindle and Spindle Speed Controller


There’s a pretty thorough discussion of the speed control system on this Inventables Blog.

You’ll also find a good discussion of how and why certain parameters should be set on the Shapeoko Forum.