@vaswood If you use T2Laser with my Grbl 1.1e DEFAULT firmware it should work normally, just make sure other software is not being used as they block access to the laser (reboot your PC and don't run Elekscam or others).

Well..
First, thank you for the fast replay!
That been said: I order that unit from the BangGood and it claimed to be Eleksmaker.. Didn`t research so much just bought it. Now, finding the website seems the sales on that shop where kind of misleading..

As for the driver problem - today arrived some Arduino Nano boards I order ages ago and that give me chance to try with one of them:

upload fresh GRBL 1.1h connect laser's driver +TTL pin to D11, and GND to the arduino`s GND
Worked as expected : power control , and laser OFF right from the start until I choose to start it via code.
Second I try using PC817 optoisolator connected to D11 and same way as on my diagram one post above - also working as charm.

That give me reason to investigate the mainboard what suppose to drive the machine and seems some uncleaned flux and bad solder spots where the reason!
After resoldering done over some points in the area I suspect, and full clean with alcohol for electronics the board start to control properly the laser driver!

Driver's logic is normal not inverted: +5V (HIGH) , 0 (LOW)

Thanks!

@mawu It's difficult to say what was damaged, so you connected a 24VDC power supply?

The input capacitor is likely damaged but the stepper drivers and motors would be OK as would the MOSFET. The big question is the laser module, unfortunately it is probably damaged. If you have a soldering iron you could remove the input capacitor (the one marked 16V) and see if everything works or not. If not, you'll need to get a replacement board.

@พุทธินันท์-สำแดงเดช No idea, I am the developer of T2Laser and it is supplied with firmware that supports power control using TTL/PWM.

Thank you for looking over the code Zax.

Update: Now everything is working fine.

It works fine with g-code and I now use 'LaserWeb4' to generate gcode for my EleksLaser.

It was a bit tricky, however, to find the dmg-installer for 'LaserWeb4' for mac. So here is a short recipe I wrote on github:

/ I found a solution to get the dmg from the site.

I opened downloads https://github.com/LaserWeb/LaserWeb4-Binaries/releases I opened the source code by pressing "⌘U" (my web browser is 'Opera' by the way) I seached for "dmg" by pressing "⌘F" I found the top link and clicked it. The link was this:
/LaserWeb/LaserWeb4-Binaries/releases/download/untagged-4818330b6baa8213d4a7/laserweb-builder-v4.0.996-130-x86_64.AppImage

I hope this is helpful. /

More so I did configure the 'LaserWeb4' for import from 'Illustrator' I by changing the 'pxpi' to "72" under SVG in 'File Settings'. I assume that is default on 'Illustrator' when i export .svg-files. At least on my computer.

Under the 'Gcode'-section I have these configurations:
GCODE START:
G21
G90
M4
GCODE END:
M18
GCODE HOMING:
G28
TOOL ON:
M3
TOOL OFF:
M5

Under the 'Machine'-settings I have:
MACHINE WIDTH: 400
MACHINE HEIGHT: 300
BEAM Ø:0.2

And thats it- I don't know if this is perfect, but at least it generates g-code that the machine executes. And the scaling is correct.

Please add to this if anyone sees any improvements.

Edit: To all of you who don't want to mess around like this just to run on Mac: I really recommend to just run a Windows-OS and Zax's 'T2 Laser'-software. That's really much Simpler.

Edit2: Also I discovered that I can use 'Rhinoceros' if I export as .dxf. The 'LaserWeb4' reads it just like .svg and the scaling is still correct. What is great I think is that the layers comes sorted - meaning I can have one layer as a 'light striped hatch', another one as 'solid hatch' and a third one as 'cut' with multiple passes.

Edit3: I had a problem with curved lines which 'LaserWeb4' couldn't read. I am also not sure if EleksLaser/Grlb1.1e supports curved lines neither, even though i found supposedly code 'G64' generally should enable 'continuous curved lines' and code 'G61' disable it. The simplest solution I have found so far is to export 'illustrator'-works as .dxf and then open it with 'Rhino' and the use command 'convert' to turns all curves into very small straight lines so it can be read by 'LaserWeb4' and standard Gcode.

@Paťo-1 You need to invert the signal, the design of that laser driver is stupid. I am not aware of any way simple method to invert the spindle PWM output in Grbl but it may be possible.

Line up the above charts double || || . The forum removed the extra spaces.

I am an electronics tech & traced all the pins on the Eleks limit switch board. As soon as I get the off-line controller connected, I will post my results along with pictures.

@Zax The laser has been unused for a year and a half until i had the time to make a ventilation system. I may have moved the laser while i was asembling the ventilation

Should i change the pololu drivers?

For anyone is still reading this after 10 months.
If you want to use Normally Closed (NC) switches, which is the industry standard and the safer option. Just use the NC connection on the switches and Com. Then if you use more than one switch on an axis you wire them in series (Ground from Arduino / Controller board to Com on first switch, NC from first switch to Com on second, NC on second switch to Com on third switch, NC from third switch to approriate limit pin on Arduino. Pin 9 for X axis, 10 for Y and 12 for Z. Then change $5 to 1 in GRBL configuration settings.

@Airmaster If you are using T2Laser that is not a G-code issue, it's a mechanical shift either because you are using a higher feed rate and have lower torque or something is heating up and friction is increasing.

no i dont have one

@siggidrechsler Read the forums, this is very common due to a bug in Elekscam software. I wrote T2Laser as an alternate software, it will work with the stock firmware but using my Grbl 1.1e DEFAULT provides better motion control and many more features.

@Apehanger "If you connect D11 and GND to the laser module while the Nano is unplugged from the board - does it work?
I'm assuming the answer is yes, "
Missed that.
The answer is no. There is no difference - 12v with laser disconnected, 3.1v when laser connected and powered on.

@Jonatas-Silva said in Modulo laser:

Qual a diferença de pwm para ttl? What is the difference from pwm to ttl?

TTL is a voltage definition.
PWM is a signal modulation.

They are exclusive although the Chinese seem to get them confused.

You can have a TTL/PWM or a 12VDC/PWM or a TTL/non-PWM etc etc.

@bongars Just reverse the X axis:

Is the dot coming from the power up of your laser? (when you connect)

If so you need to either add a pull down resistor as has been discussed many times on the forum or leave the laser off until you are connected and Grbl is booted up. The safe option is a pull down as if the PC or driver crashes, the USB is pulled out or the TTL wire breaks the laser will go full on.