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fra589 / grbl-Mega-5X

5/6 Axis version of Grbl, the open source, embedded, high performance g-code-parser and CNC milling controller written in optimized C that will run on an Arduino Mega2560
https://github.com/fra589/grbl-Mega-5X/wiki
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Different pwm pin for laser and spindle #112

Closed MarkXYZ-Mtl closed 1 year ago

MarkXYZ-Mtl commented 4 years ago

Hi, Like the title says, is it possible to have 2 different pin for spindle and laser triggered by the $32 variable, it can be a relay output too. I want to have both laser and spindle mounted on the machine. I had a look at the code but without success.

Thanks

fra589 commented 4 years ago

Hi @ MarkXYZ-Mtl, It's a good idea... Using $ 32 is a possibility, but not the only one ... In fact, the idea is to have 2 PWM outputs: One on D8 in 0-12V and the other on another port in 0-5V. We can therefore also imagine using new commands such as M3.1, M4.1 and M5.1 to control the second output. I add this to my TODO list. 😃 @++; Gauthier.

MarkXYZ-Mtl commented 4 years ago

Hi,

The use of a special M-code can be troublesome for cam software without editing the post processor.

Can be an option to choose either special M code or $32?

And it would be nice if the $32=1 can activate a relay for the main laser power for safety reasons.

Thanks for your interest!

fra589 commented 4 years ago

Hi,
As I writed:

Using $ 32 is a possibility, but not the only one ...

I analyze a need, not a solution...

The need is to have more than one PWM output to drive the tool with a choice of 5V or 12V PWM without the need of recompiling the firmware.

$32 is a candidate solution, but not the only one for doing this.

The original need can give other oportunities to have other benefit such having more than one tool using both 12V and 5V PWM output in the same GCode program, in this case, $32 will not be candidate since it's not a GCode order.

The final implementation probably offer more than one solution with more than one compil option.

@++;
Gauthier.

martinjurekcz commented 4 years ago

Hello guys, that would be really amazing. Does the arduino board have any PWM pins left for this? Im designing laser engraving machines. I already designed new prototype and CAM software which would use multiple laser beams to cut down production time. However I can’t find control firmware which would be able to control multiple PWMs as an output for laser modules. Can I help to make it happen? I dont know grbl so much, but few advices on where to start would really help :)

zalexzperez commented 2 years ago

Is this feature request what I need if I want to control the speed of a fan connected to an MKS GEN L board?

It's for a foam cutting machine. The hotwire is currently controlled with the heated bed output (D8 pin) which is PWM regulated. But the extra pins (hotends, fan...) are either fully on or off.

RaphaelDives commented 2 years ago

Hey @MarkXYZ-Mtl how did you solve your problem? (If you solved it at all...) I'm now a proudly owner of a shiny new laser module and have the same issue... 😁 Can I somehow connect the laser input to the D8 pin parallel to the Ramps output? (Directly on the arduino pin) In my mind I can "control" the output by just connecting my laser or my spindle and use just the same pin... Could this be possible or ist it just another bad idea?! Thanks for your ideas and thoughts!

Cheers Raphael

fra589 commented 2 years ago

Hi @MarkXYZ-Mtl, @martinjurekcz, @zalexzperez, @RaphaelDives,

I just pushed the new 1.2g.20220620 grbl-Mega-5X version with 2 new main features:

By default, $35 and $36 are defined to be unit value given in volts (depending of the RAMPS output pin 12v for D8/D9 or 5v for D6). Then, if you send M68Q3, the output will immediately be approximatively 3v (depending of your electronic precision). The analog output state have been added to the status report <...> initiated by the '?' character. Depending on $10 status report mask settings, analog output value may be sent as either:

For compatibility reasons, the optional analog PWM output is disables by default. To use it, you need to enable #define USE_OUTPUT_PWM line in config.h (line 164).

Since I don't have any laser or special device to test those functionality in the real world (I only verified the outputs with multimeter) please, test it and report if it work for you or if you have any problem with this version. Thanks in advance for your tests reports.

@++; Gauthier.

martinjurekcz commented 2 years ago

Hi @fra589 that sounds amazing ! :)) I will test it during july and report the performance. Can't wait for it. Thanks again, you are our hero 💯 Will report my tests soon, have a great day, Martin

RaphaelDives commented 2 years ago

Same here! Thank you so much! I will test it on my MPCNC asap and report back! (Although I need to do some hardware changes.) Cheers Raphael

zalexzperez commented 2 years ago

Hi @fra589

I tested the latest grbl-mega-5x version with bad results :(

Machine working fine on a MKS Gen L board. It is able to jog, home and D8, D9, D10 outputs are properly enabled.

However, enabling USE_OUTPUT_PWM in config.h makes the machine break. It doesn't jog nor is it able to enable any outputs. Homing works, though...

edit: And the new PWM output on D9 works too. However, I just realized that with the current implementation of PWM outputs on grbl, controlling the speed of 12V fans makes them produce an unbearable whining noise. I had the same noise in Marlin, but they released an option called FAN_SOFT_PWM which "Uses software PWM to drive the fan, as for the heaters. This uses a very low frequency" along with SOFT_PWM_SCALE and SOFT_PWM_DITHER.

This is what the console throws when jogging:

client $J=G21G91 X1250 F3000 error:28 (Invalid gcode ID:28) client \x85

This is what the console shows when trying to enable some outputs:

feeder M3 S21570 error:28 (Invalid gcode ID:28) feeder M7 error:28 (Invalid gcode ID:28) feeder M8 error:28 (Invalid gcode ID:28) feeder M9 error:28 (Invalid gcode ID:28)

In config.h I literally ONLY changed the following: -Axis definition (4-axis) -Disabled HOMING_INIT_LOCK -Different homing sequence to only home the X-axes

I didn't touch anything else in config.h file or anywhere else! I'm attaching my config.zip here, you can search for "//Changed" to quickly see my changes.

And I did perform a $RST=* after flashing the new firmware and also disabled the soft limits. Tried twice with the same result.

fra589 commented 2 years ago

Hi @zalexzperez,

Thanks for reporting...
Reminds me of the typo bug in gcode.c that I fixed shortly after...
Can you post the output of the $I command so that I can check the version and compilation settings of your Grbl?

@++;
Gauthier.

zalexzperez commented 2 years ago

Hi @fra589 This is the output:

client $I [VER:1.2g.20220620:] [AXS:4:XY] [OPT:VNMGHQL,35,255,80] ok

fra589 commented 2 years ago

Hi @zalexzperez,

It was a new bug!
I found and corrected it. The new version 2.1g build 20220917 have been pushed few minutes ago.

Thanks for testing !

@++; Gauthier.

zalexzperez commented 2 years ago

Hi @fra589

Thanks for fixing that bug. It works now, look: https://youtu.be/LNCHpRLxbcY

However, my plans were to control two 12v fans with the extra PWM output. Unfortunately, they all make a horrible noise when powered from anything else other than constant 12V.

I suffered from this noise in my Marlin-powered 3D printer for a while, until I found there's an option to enable software PWM on the fan output pin, which is exactly D9.

On Marlin's Configuration.h file, there's a FAN_SOFT_PWM option that I had to enable, along with SOFT_PWM_SCALE which halves control resolution and SOFT_PWM_DITHER to compensate for that resolution loss. Once enabled, the fans almost make no whining sound when run at lower speeds.

Would it be possible to port this feature?

Regards, Alejandro

Host1992 commented 2 years ago

does anyone tested the "SEPARATE_SPINDLE_LASER_PIN" with succes? im stuck , my spindle relay pin is on D4, my laser pwm is on D6, (as set in my config.h) I tried everything but no pwm come out from D6

fra589 commented 2 years ago

Hi @Host1992,

Spindle on D4 is not the normal pinout output for spindle... It looks like you modified the cpu_map.h to send the spindle output to D4.
Warning !!! D4 use the Timer0 for PWM which conflicts with steppers management ! You can't use it for spindle output.

Please, post yours config.h, cpu_map.h, $I and $$ outputs for more investigations of your problem.

@++;
Gauthier.

fra589 commented 1 year ago

No news from near a month... Issue closed.