Laser connection #241

jodougie2812 · 2022-01-20T18:14:34Z

jodougie2812
Jan 20, 2022

Hi. I'm using a ramps1.4 board with my Arduino Mega.
I've got 4 axis working using GRBL GRU so that's good.
My question is how do I connect a laser with 3 wires.
Ground Positive and PWM.. where do these go on the ramps 1.4.
I've tried connecting to D8 but don't have any power showing on D8 D9 or D10

Do I need to alter any settings in GRBL to make it work under PWM
Any advice appreciated

fra589 · 2022-01-21T07:58:20Z

fra589
Jan 21, 2022
Maintainer

Hi @jodougie2812,

Ground and Positive must be connected to any available GND & "+" connection of the RAMPS board:
https://www.google.com/search?client=firefox-b-d&q=RAMPS+1.4+pinout
https://github.com/fra589/grbl-Mega-5X/wiki/grbl-Mega-5X-pinout

Search for "laser pwm" on grbl-Mega-5X / issues / discussions / wiki and you should find some already answered similar questions:
https://www.google.com/search?client=firefox-b-d&q=laser+pwm+%2Bsite%3Ahttps%3A%2F%2Fgithub.com%2Ffra589%2Fgrbl-Mega-5X

If it's not enough, ask a specific question explaining what you did, the result obtained, as well as the expected result.
Do not forget to specify what is your version of grbl-Mega-5X and as well as the configuration affected by the question.

@++;
Gauthier.

2 replies

jodougie2812 Jan 24, 2022
Author

Thanks for your response. I'm now totally confused and my head is about to explode 🤣🤣🤯
When I connect the laser to pos and neg on the ramps board it lights up. I havent connected to the PWM pins yet. Is it the PWM signal which makes the laser turn off until required.
The information about altering configuration h, I think I understand. However the info about altering the settings in cpu maps.h is confusing.
I'm using the standard, latest version of GRBL MEGA X on a Arduino Mega wIth a Ramps 1.4
Thanks in hopeful anticipation

jodougie2812 Jan 24, 2022
Author

These are the settings I made in
config.h

// Chose the spindle pin output :
// SPINDLE_PWM_ON_D8 => 0-12v 16 bits PWM on RAMPS D8
// SPINDLE_PWM_ON_D6 => 0-5v 8bits PWM on RAMPS Servo 2 signal (Mega 2560 D6)
// Uncomment the line which correspond to your hardware
//#define SPINDLE_PWM_ON_D8
#define SPINDLE_PWM_ON_D6

and in cpu_map.h

// Advanced Configuration Below You should not need to touch these variables

// Set Timer up to use TIMER4C which is attached to Digital Pin 6 - Ramps Servo 2
#define SPINDLE_PWM_MAX_VALUE 255.0 // Since it's a 8bit timer
#ifndef SPINDLE_PWM_MIN_VALUE
#define SPINDLE_PWM_MIN_VALUE 1 // Must be greater than zero.
#endif
#define SPINDLE_PWM_OFF_VALUE 0
#define SPINDLE_PWM_RANGE (SPINDLE_PWM_MAX_VALUE-SPINDLE_PWM_MIN_VALUE)

#define SPINDLE_TCCRA_REGISTER TCCR4A
#define SPINDLE_TCCRB_REGISTER TCCR4B
#define SPINDLE_OCR_REGISTER OCR4A
#define SPINDLE_COMB_BIT COM4A1

#define SPINDLE_TCCRA_INIT_MASK (1<<WGM41)
#define SPINDLE_TCCRB_INIT_MASK ((1<<WGM42) | (1<<WGM43) | (1<<CS41))
#define SPINDLE_OCRA_REGISTER ICR4
#define SPINDLE_OCRA_TOP_VALUE 0xFF // PWM counter reset value. Should be the same as PWM_MAX_VALUE in hex.

// Define spindle output pins.
#define SPINDLE_PWM_DDR DDRH
#define SPINDLE_PWM_PORT PORTH
#define SPINDLE_PWM_BIT 3 // MEGA2560 Digital Pin 6

#define SPINDLE_PWM_MAX_VALUE     1024.0 // Translates to about 1.9 kHz PWM frequency at 1/8 prescaler
#ifndef SPINDLE_PWM_MIN_VALUE
  #define SPINDLE_PWM_MIN_VALUE   1   // Must be greater than zero.
#endif
#define SPINDLE_PWM_OFF_VALUE     0
#define SPINDLE_PWM_RANGE         (SPINDLE_PWM_MAX_VALUE-SPINDLE_PWM_MIN_VALUE)

//Control Digital Pin 8
#define SPINDLE_TCCRA_REGISTER    TCCR4A
#define SPINDLE_TCCRB_REGISTER    TCCR4B
#define SPINDLE_OCR_REGISTER      OCR4C
#define SPINDLE_COMB_BIT          COM4C1

// 1/8 Prescaler, 16-bit Fast PWM mode
#define SPINDLE_TCCRA_INIT_MASK ((1<<WGM40) | (1<<WGM41))
#define SPINDLE_TCCRB_INIT_MASK ((1<<WGM42) | (1<<WGM43) | (1<<CS41))
#define SPINDLE_OCRA_REGISTER   OCR4A // 16-bit Fast PWM mode requires top reset value stored here.
#define SPINDLE_OCRA_TOP_VALUE  0x400 // PWM counter reset value. Should be the same as PWM_MAX_VALUE in hex.

// Define spindle output pins.
#define SPINDLE_PWM_DDR   DDRH
#define SPINDLE_PWM_PORT  PORTH
#define SPINDLE_PWM_BIT   5 // MEGA2560 Digital Pin 8

#elif defined (SPINDLE_PWM_ON_D6)
There are a few different descriptions of whats needed and i'm confused.
Please help
Thank you

jodougie2812 · 2022-01-24T17:10:37Z

jodougie2812
Jan 24, 2022
Author

The laser is connected to 12v pos and negative on the board. It fires continuously. If I connect PWM to the negative terminal on P6 the laser switches off. Breaking that connection fires the laser.
Running laser GRBL doesn't control the PWM signal on P6
HELP please

0 replies

fra589 · 2022-01-24T19:22:28Z

fra589
Jan 24, 2022
Maintainer

Hi @jodougie2812,

To change the spindle output from the standard 12V PWM output on D8 to the 5V PWM output on D6, you don't need to change anything in the cpu_map.h file.

You simply have to comment the //#define SPINDLE_PWM_ON_D8 and uncomment the #define SPINDLE_PWM_ON_D6 like you did without anything else. The #if defined(SPINDLE_PWM_ON_D8) and #elif defined (SPINDLE_PWM_ON_D6) preprocessor compilation lines in cpu_map.h will take care of taking the right parameters.

Then, the PWM signal on D6 will be drived with standard spindle speed GCode command:

S<value> with value ~~between 0 to 255~~ edited: between "Minimum spindle speed" value ($31) and the "Maximum spindle speed" value ($30).,
M3 to start the ~~Spindle~~ Laser,
M5 to stop the ~~Spindle~~ Laser.

@++;
Gauthier.

0 replies

jodougie2812 · 2022-01-25T07:40:01Z

jodougie2812
Jan 25, 2022
Author

Good morning Well. I've taken a fresh download of your software. Changed the code in configuration.h and reconnected the laser. The pwm wire when connected to D6 negative turns off the laser. If I break the connection the laser fires. However. I'm not getting any control of the laser in my software. I'm using laser grbl where $32=1 Thanks for your continuing assistance. John

…

On Mon, 24 Jan 2022, 19:22 Gauthier Brière, ***@***.***> wrote: Hi @jodougie2812 <https://github.com/jodougie2812>, To change the spindle output from the standard 12V PWM output on D8 to the 5V PWM output on D6, you don't need to change anything in the cpu_map.h file. You simply have to comment the //#define SPINDLE_PWM_ON_D8 and uncomment the #define SPINDLE_PWM_ON_D6 like you did without anything else. The #if defined(SPINDLE_PWM_ON_D8) and #elif defined (SPINDLE_PWM_ON_D6) preprocessor compilation lines in cpu_map.h will take care of taking the right parameters. Then, the PWM signal on D6 will be drived with standard spindle speed GCode command: - S<value> with value between 0 to 255, - M3 to start the Spindle Laser, - M5 to stop the Spindle Laser. @++; Gauthier. — Reply to this email directly, view it on GitHub <#241 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AQPQG43CCA6IXJPOYLJ6PGTUXWRIHANCNFSM5MNOYEZA> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>. You are receiving this because you were mentioned.Message ID: ***@***.***>

0 replies

fra589 · 2022-01-25T08:50:42Z

fra589
Jan 25, 2022
Maintainer

Good morning @jodougie2812,

Can you tell me more about your laser module?... Reference, link to documentation / datasheet, ...
I don't know a lot of thing about lasergrbl, but I know it use the M5/M3S to drive the power of the laser. So, it should work fine with grbl-Mega-5X.
I rather suspect a hardware problem.
Are you able to check the voltage on PWM pin D6 with a multimeter with differents values of M3S?

@++;
Gauthier.

0 replies

jodougie2812 · 2022-01-25T10:46:55Z

jodougie2812
Jan 25, 2022
Author

Here you go. The laser is a cheap Chinese thing supplied with my 3018 machine. It works fine on that machine. I have put my multimeter across D6 with various settings and there is no voltage showing on any settings. My 12 volt supply from the ramps powers up the laser. If I ground the PWM it switches the laser off. Is that correct?. Should the PWM signal be on the positive side 🤔

…

On Tue, 25 Jan 2022, 08:50 Gauthier Brière, ***@***.***> wrote: Good morning @jodougie2812 <https://github.com/jodougie2812>, Can you tell me more about your laser module?... Reference, link to documentation / datasheet, ... I don't know a lot of thing about lasergrbl, but I know it use the M5/M3S to drive the power of the laser. So, it should work fine with grbl-Mega-5X. I rather suspect a hardware problem. Are you able to check the voltage on PWM pin D6 with a multimeter with differents values of M3S? @++; Gauthier. — Reply to this email directly, view it on GitHub <#241 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AQPQG44KBO4XJJUGVSQZBN3UXZP65ANCNFSM5MNOYEZA> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>. You are receiving this because you were mentioned.Message ID: ***@***.***>

1 reply

fra589 Jan 25, 2022
Maintainer

I have put my multimeter across D6 with various settings and there is no voltage showing on any settings.

It's not normal. You should have positive voltage on D6, depending of the value of the S parameter.
The S (Spindle speed) parameter value can be between the "Minimum spindle speed" value ($31) and the "Maximum spindle speed" value ($30).
If you don't change them, by default, $31=550 and $30=12000.
So:

M3S12000 => will give about 5V on D6,
M3S550 => will give few millivolts on D6,
M3S6275 => will give about 2.5V on D6 (6250 is the middle between 550 and 12000).

@++;
Gauthier.

jodougie2812 · 2022-01-25T16:25:23Z

jodougie2812
Jan 25, 2022
Author

I will try those settings. Thank you

…

On Tue, 25 Jan 2022, 16:23 Gauthier Brière, ***@***.***> wrote: I have put my multimeter across D6 with various settings and there is no voltage showing on any settings. It's not normal. You should have positive voltage on D6, depending of the value of the S parameter. The S (Spindle speed) parameter value can be between the "Minimum spindle speed" value ($31) and the "Maximum spindle speed" value ($30). If you don't change them, by default, $31=550 and $30=12000. So: - M3S12000 => will give about 5V on D6, - M3S550 => will give few millivolts on D6, - M3S6275 => will give about 2.5V on D6 (6250 is the middle between 550 and 12000). @++; Gauthier. — Reply to this email directly, view it on GitHub <#241 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AQPQG42DGTC4252RHDZPKCDUX3FALANCNFSM5MNOYEZA> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>. You are receiving this because you were mentioned.Message ID: ***@***.***>

0 replies

jodougie2812 · 2022-01-25T16:31:19Z

jodougie2812
Jan 25, 2022
Author

Am I connecting the PWM from the laser to D6 positive and the earth to earth with the 12v positive to 12 volts please 🙏

…

On Tue, 25 Jan 2022, 16:25 Jo Dougie, ***@***.***> wrote: I will try those settings. Thank you On Tue, 25 Jan 2022, 16:23 Gauthier Brière, ***@***.***> wrote: > I have put my multimeter across D6 with various settings and there is no > voltage showing on any settings. > > It's not normal. You should have positive voltage on D6, depending of the > value of the S parameter. > The S (Spindle speed) parameter value can be between the "Minimum spindle > speed" value ($31) and the "Maximum spindle speed" value ($30). > If you don't change them, by default, $31=550 and $30=12000. > So: > > - M3S12000 => will give about 5V on D6, > - M3S550 => will give few millivolts on D6, > - M3S6275 => will give about 2.5V on D6 (6250 is the middle between > 550 and 12000). > > @++; > Gauthier. > > — > Reply to this email directly, view it on GitHub > <#241 (reply in thread)>, > or unsubscribe > <https://github.com/notifications/unsubscribe-auth/AQPQG42DGTC4252RHDZPKCDUX3FALANCNFSM5MNOYEZA> > . > Triage notifications on the go with GitHub Mobile for iOS > <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> > or Android > <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>. > > You are receiving this because you were mentioned.Message ID: > ***@***.***> >

1 reply

fra589 Jan 25, 2022
Maintainer

I don't know about the exact laser you have, but I find this with Google:
https://wiki.nejetool.com/doku.php?id=laser_module_308020w

This mean that you have to connect 12V positive to 12V POWER, GND to Grbl's GND and SIGNAL to the D6 PWM Grbl's output.

@++;
Gauthier.

jodougie2812 · 2022-01-25T19:00:01Z

jodougie2812
Jan 25, 2022
Author

Thank you that is most helpful.

…

On Tue, 25 Jan 2022, 16:44 Gauthier Brière, ***@***.***> wrote: I don't know about the exact laser you have, but I find this with Google: https://wiki.nejetool.com/doku.php?id=laser_module_308020w This mean that you have to connect 12V positive to 12V POWER, GND to Grbl's GND and SIGNAL to the D6 PWM Grbl's output. @++; Gauthier. — Reply to this email directly, view it on GitHub <#241 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AQPQG43TPMLI5QWV374S6OTUX3HNLANCNFSM5MNOYEZA> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>. You are receiving this because you were mentioned.Message ID: ***@***.***>

1 reply

jodougie2812 Jan 26, 2022
Author

Well. This is what I did.
I set the values of $30 and $31 as you suggested. I sent some laser g code from both laserGRBL and lightburn I had no voltage at all on D6. So I reflashed the board with the unaltered GRBLMega firmware. I put my multimeter across D8 pos/neg and had a voltage of 1.2 volts. Running the g code again I had a pulsing voltage between 0 and 1.2 volts.
I confused as to why the laser activates when powered up and switches off I the earth the PWM wire. I thought to run the pwm wire through the D8 terminals to see if that worked. I didn't for fear of blowing something up.
Any thoughts please
John

fra589 · 2022-01-27T09:58:05Z

fra589
Jan 27, 2022
Maintainer

I don't suggested any values for $30 & $31... I just tell you what are their default values.
Then, I suggested to use a terminal or software that can send direct Grbl's commands to send the command: M3S<value of $30>
If you send this command, you should have the full voltage of PWM.
Have you read the Lasergrbl's documentations about the PWM power laser configuration?
https://lasergrbl.com/configuration/
https://lasergrbl.com/wp-content/uploads/2020/05/Grbl-Configuration-ENG.pdf
Do you what are the S values send by your software when you try to measure the PWM voltage?

0 replies

jodougie2812 · 2022-01-27T10:18:45Z

jodougie2812
Jan 27, 2022
Author

Ok, I will do that.

…

On Thu, 27 Jan 2022, 09:58 Gauthier Brière, ***@***.***> wrote: I don't suggested any values for $30 & $31... I just tell you what are their default values. Then, I suggested to use a terminal or software that can send direct Grbl's commands to send the command: M3S<value of $30> If you send this command, you should have the full voltage of PWM. Have you read the Lasergrbl's documentations about the PWM power laser configuration? https://lasergrbl.com/configuration/ https://lasergrbl.com/wp-content/uploads/2020/05/Grbl-Configuration-ENG.pdf Do you what are the S values send by your software when you try to measure the PWM voltage? — Reply to this email directly, view it on GitHub <#241 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AQPQG45FQIVHU2TYUJIHW3TUYEJL5ANCNFSM5MNOYEZA> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>. You are receiving this because you were mentioned.Message ID: ***@***.***>

0 replies

jodougie2812 · 2022-01-27T10:49:25Z

jodougie2812
Jan 27, 2022
Author

Wow this is strange.... When I use the fire button in Lightburn with a value of 1000. I get a voltage of 1.17 volts... When I increase the value to 1500 I get a voltage of .42 volts When I increase the value to 2000. I get a negative on the multimeter. It looks like that if I increase the power in all software (lightburn, laserGRBL and UGS). The power goes down not up. Do I need to invert something please.

…

On Thu, 27 Jan 2022, 09:58 Gauthier Brière, ***@***.***> wrote: I don't suggested any values for $30 & $31... I just tell you what are their default values. Then, I suggested to use a terminal or software that can send direct Grbl's commands to send the command: M3S<value of $30> If you send this command, you should have the full voltage of PWM. Have you read the Lasergrbl's documentations about the PWM power laser configuration? https://lasergrbl.com/configuration/ https://lasergrbl.com/wp-content/uploads/2020/05/Grbl-Configuration-ENG.pdf Do you what are the S values send by your software when you try to measure the PWM voltage? — Reply to this email directly, view it on GitHub <#241 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AQPQG45FQIVHU2TYUJIHW3TUYEJL5ANCNFSM5MNOYEZA> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>. You are receiving this because you were mentioned.Message ID: ***@***.***>

1 reply

fra589 Jan 27, 2022
Maintainer

What are your $30 & $31 values ?

jodougie2812 · 2022-01-27T11:08:38Z

jodougie2812
Jan 27, 2022
Author

$30 =12000 $31=500

…

On Thu, 27 Jan 2022, 10:56 Gauthier Brière, ***@***.***> wrote: What are your $30 & $31 values ? — Reply to this email directly, view it on GitHub <#241 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AQPQG42IE3GCRPEW7BPBBJ3UYEQGVANCNFSM5MNOYEZA> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>. You are receiving this because you were mentioned.Message ID: ***@***.***>

1 reply

fra589 Jan 27, 2022
Maintainer

Try the same values in Lightburn with $30=2000 and $31=0

jodougie2812 · 2022-01-27T11:52:43Z

jodougie2812
Jan 27, 2022
Author

😊 Thank you . That has worked.. I now need to discover which pins to use for a probe. Your help in this community is so very much appreciated

…

On Thu, 27 Jan 2022, 11:20 Gauthier Brière, ***@***.***> wrote: Try the same values in Lightburn with $30=2000 and $31=0 — Reply to this email directly, view it on GitHub <#241 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AQPQG4YXYSYC7K3HAQ7WCALUYES6RANCNFSM5MNOYEZA> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>. You are receiving this because you were mentioned.Message ID: ***@***.***>

1 reply

fra589 Jan 28, 2022
Maintainer

I now need to discover which pins to use for a probe.

Please, read the doc: https://github.com/fra589/grbl-Mega-5X/wiki
More precisely: https://github.com/fra589/grbl-Mega-5X/wiki/grbl-Mega-5X-pinout

@++;
Gauthier

jodougie2812 · 2022-01-27T15:30:06Z

jodougie2812
Jan 27, 2022
Author

I spoke too soon. I suspect either a dodgy ramps or laser?...I am replacing both Thankyou

…

On Thu, 27 Jan 2022, 11:52 Jo Dougie, ***@***.***> wrote: 😊 Thank you . That has worked.. I now need to discover which pins to use for a probe. Your help in this community is so very much appreciated On Thu, 27 Jan 2022, 11:20 Gauthier Brière, ***@***.***> wrote: > Try the same values in Lightburn with $30=2000 and $31=0 > > — > Reply to this email directly, view it on GitHub > <#241 (reply in thread)>, > or unsubscribe > <https://github.com/notifications/unsubscribe-auth/AQPQG4YXYSYC7K3HAQ7WCALUYES6RANCNFSM5MNOYEZA> > . > Triage notifications on the go with GitHub Mobile for iOS > <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> > or Android > <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>. > > You are receiving this because you were mentioned.Message ID: > ***@***.***> >

0 replies

jodougie2812 · 2022-01-28T07:43:32Z

jodougie2812
Jan 28, 2022
Author

Thank you.

…

On Fri, 28 Jan 2022, 06:38 Gauthier Brière, ***@***.***> wrote: I now need to discover which pins to use for a probe. Please, read the doc: https://github.com/fra589/grbl-Mega-5X/wiki More precisely: https://github.com/fra589/grbl-Mega-5X/wiki/grbl-Mega-5X-pinout @++; Gauthier — Reply to this email directly, view it on GitHub <#241 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AQPQG4YWNZD26NAO2TFOXB3UYI2YDANCNFSM5MNOYEZA> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>. You are receiving this because you were mentioned.Message ID: ***@***.***>

5 replies

jodougie2812 Feb 6, 2022
Author

Now got my replacement boards. So I hope I can report success tomorrow

jodougie2812 Feb 10, 2022
Author

Sorry to be on here again. I'm very puzzled. I've put in a new Arduino Mega and Ramps 1.4 but I still have laser problems. I've read so much stuff on what to do. Much of it is beyond my limited knowledge. I'm too old to learn. Or it is contradictory.
Here's what I've got now.....
I've flashed the arduino with Grbl Mega 5x with the modified configuration.h file to use D6 as the PWM for my laser..
Running a simple file from LaserGRBL and Lightburn I get the same result. I have a modulating voltage on D8 and a static 5v on D6, no modulation.. any ideas as to what I'm doing wrong.....I'm about to give up and just use the laser on my 3 axis CNC but I really want to use it on the rotary A axis

jodougie2812 Feb 10, 2022
Author

If I connect the PWM lead to positive or negative on D8 I get the laser firing but not modulating with the PWM. It works well with my CNC shield

jodougie2812 Feb 10, 2022
Author

Essentially. What I don't understand is why the output from the 3018 board and the pwm pin on the CNC shield works. Whereas the PWM output from the RAMPS shield doesnt

fra589 Feb 12, 2022
Maintainer

Hi @jodougie2812

Can you share your full edited version of grbl-Mega-5X (in a .zip file)?
Please, also post your full config (result of $$ and $I) grbl's commands.

I'm not at home, but I have some moments where I can look at it and try to understand what happen to you.

@++;
Gauthier.

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Laser connection #241

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Laser connection #241

jodougie2812 Jan 20, 2022

Replies: 16 comments · 13 replies

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