Does anyone know how I can get an LED to Pulse
I use neopixel
so I want to do something smart with the M150 and the conditional G-code
but I find it hard to learn
I had envisioned something like this for the arduino
but the things are not called the same and it is not set up in the same way 
int led = 9; // the PWM pin the LED is attached to
int brightness = 0; // how bright the LED is
int fadeAmount = 5; // how many points to fade the LED by
// the setup routine runs once when you press reset:
void setup() {
// declare pin 9 to be an output:
pinMode(led, OUTPUT);
}
// the loop routine runs over and over again forever:
void loop() {
// set the brightness of pin 9:
analogWrite(led, brightness);
// change the brightness for next time through the loop:
brightness = brightness + fadeAmount;
// reverse the direction of the fading at the ends of the fade:
if (brightness <= 0 || brightness >= 255) {
fadeAmount = -fadeAmount;
}
// wait for 30 milliseconds to see the dimming effect
delay(30);
}
I have also found this for duet3D
and if I replace M42 P1 S{var.i} with M150 E0 R{var.i} U0 B0 P255 S10 F1 it just gives me errors
; Flash red
var i = 0.0
while var.i <= 1
M42 P1 S{var.i}
G4 P10
set var.i = var.i + 0.01
fade/pulse
https://docs.duet3d.com/en/User_manual/Reference/Gcode_meta_commands
