PWM not getting power

looking for some help with a problem im having. trying to get pwn signal to the laser. trying to get it on to focus the beam.

with these settings
$30=255
$31=0
$32=1
i run M03 S25 and receive no output readings. volts stay 0.0

but if i do this
$30=0
$31=255
$32=1
then run M03 S25 i get 5.0 volts. but no matter what Sxxx value i use, the volts do not change, always holds at 5

Grbl 1.1f [’$’ for help]

$$
$0 = 10 (Step pulse time, microseconds)
$1 = 255 (Step idle delay, milliseconds)
$2 = 0 (Step pulse invert, mask)
$3 = 4 (Step direction invert, mask)
$4 = 0 (Invert step enable pin, boolean)
$5 = 0 (Invert limit pins, boolean)
$6 = 0 (Invert probe pin, boolean)
$10 = 115 (Status report options, mask)
$11 = 0.020 (Junction deviation, millimeters)
$12 = 0.002 (Arc tolerance, millimeters)
$13 = 1 (Report in inches, boolean)
$20 = 0 (Soft limits enable, boolean)
$21 = 0 (Hard limits enable, boolean)
$22 = 1 (Homing cycle enable, boolean)
$23 = 3 (Homing direction invert, mask)
$24 = 25.000 (Homing locate feed rate, mm/min)
$25 = 2000.000 (Homing search seek rate, mm/min)
$26 = 250 (Homing switch debounce delay, milliseconds)
$27 = 1.000 (Homing switch pull-off distance, millimeters)
$30 = 255 (Maximum spindle speed, RPM)
$31 = 0 (Minimum spindle speed, RPM)
$32 = 1 (Laser-mode enable, boolean)
$100 = 40.000 (X-axis travel resolution, step/mm)
$101 = 40.000 (Y-axis travel resolution, step/mm)
$102 = 188.976 (Z-axis travel resolution, step/mm)
$110 = 8000.000 (X-axis maximum rate, mm/min)
$111 = 8000.000 (Y-axis maximum rate, mm/min)
$112 = 500.000 (Z-axis maximum rate, mm/min)
$120 = 500.000 (X-axis acceleration, mm/sec^2)
$121 = 500.000 (Y-axis acceleration, mm/sec^2)
$122 = 50.000 (Z-axis acceleration, mm/sec^2)
$130 = 790.000 (X-axis maximum travel, millimeters)
$131 = 790.000 (Y-axis maximum travel, millimeters)
$132 = 100.000 (Z-axis maximum travel, millimeters)

im at a loss on this one so i had to ask for help. im sure im forgetting something to tell you… but im sure someone will remind me.

Thanks for your time and help!
Mo

Your grbl settngs printout would indicate that you don’t have 1.1f loaded unless there have been some recent changes to 1.1f.

If you want to use grbl version 1.1f with a laser it has some odd requirements that are included in its “safety” mode which modifies the way some G-code commands work.

If you don’t need the feed rate or spindle speed over rides there is a way to use the laser without having to deal with G-code changes ( a modified version of 1.0c)

Here is the documentation that would allow you to use 1.1f.

What software are you using to send the G-code? (I’m guessing - Easel?)

ugs.

Just to do a little clean up.

For 1.1f

Set $10=1
Set $25=750.000 (your value is way to high for this)

You will need to read the document above to use your laser with 1.1f

thanks mate! its all working now… i was miss reading the info from the document. i have a fault in the wiring of my brain…

~Mo

2 Likes