Laser Advice and Guidance - Mesa Card

If the laser module input is TTL compatible; it should be OK
as long as there is a common ground (laser GND goes to 7I76E Gnd)

If you are concerned, you could add a say 220 Ohm resistor in series with the PWM output

chris@cnc wrote:

For the test, I loaded the PWM bitfile onto my 7i76e simulator.
The following lines are written in the hal.

Code:

 

 

What version of LinuxCNC are you using? 

I haven't found any recent implementations.  Would it be possible for you to share your *ini and *.hal files when you get it up and working?       

PCW wrote:

If the laser module input is TTL compatible; it should be OK
as long as there is a common ground (laser GND goes to 7I76E Gnd)

If you are concerned, you could add a say 220 Ohm resistor in series with the PWM output

Thank you for information,Yes laser is TTL compatible. I take now a second lesson "howto measure with scope" and found hopefully the right pins.
Just for double check. I only have this 4 Pins on laser input card.
I would now connect Laser as follow
+24V --> powersupply same for mesa card
GND --> powersupply same for mesa card
TTL + --> + 220 Ohm resistor -->TB3 PIN3
TTL-  --> TB3 PIN 1

Project_Hopeless wrote:

I haven't found any recent implementations.  Would it be possible for you to share your *ini and *.hal files when you get it up and working?       

Yes i also haven't found anything. But i like the idea to control laserpower by z high.
If its running i will share my config but for the moment i test only with this 4 lines.
I order the laser yesterday. Maybe delivered next month. I need more time to get it running.
But for today it looks not so bad. I set "halcmd setp hm2_7i76e.0.pwmgen.00.scale 5"
And PWM power now by Z-1.000 1.2V and Z-4.000 4.7V and Z-5.000 5V. So we could adjust laserpower depend on material.

And what ist PDM frequency? I change it but nothing happens on scope...

It only affects PDM mode (output-type 3)

something new about mesa datapainter and galvo interface firmware for raster greyscale engraving ?

Project_Hopeless wrote:

I haven't found any recent implementations.  Would it be possible for you to share your *ini and *.hal files when you get it up and working?       

It works now. Important lines. 
Hal changes

INI changes

FWIW, M67 is not a buffer buster and I have it working on my K40 laser via LinuxCNC/Remora but I would think it could be configured similarly for Mesa.  Thread on this is here:  forum.linuxcnc.org/49-basic-configuratio...ting?start=30#212849