problem with laser control

[patrik156]

please can someone help me with my laser. i have problem with laser control, when i set
M3 S0 i have max power
M3 S1000 is low
how i can change it
i use grbl1.1 , mana SE 3.2 LASER 5,5 w and TTL to PWM modul

[patrik156]

[patrik156]

[arkypita]

Hi @patrik156
In the picture of your laser driver I read PWM=0 : ON, PWM=1: OFF.

This is the opposite of the standard, this is the opposit of the logical signal your manaSE board generate.

You can reverse signal using a transistor (any NPN transistor is ok) as digital signal inverter between manaSE board and laser driver.

Or if you want a software solution you should re-compile and flash grbl to your arduino control board. There is a macro in grbl config.h called INVERT_SPINDLE_ENABLE_PIN that (if uncommented) allow to invert logic inside the control board.

[patrik156]

https://github.com/gnea/grbl/releases/tag/v1.1h.20190825
i download and uncommented INVERT_SPINDLE_ENABLE_PIN but now i cant upload i have this message
Sketch uses 29762 bytes (96%) of program storage space. Maximum is 30720 bytes.
Global variables use 1633 bytes (79%) of dynamic memory, leaving 415 bytes for local variables. Maximum is 2048 bytes.
Low memory available, stability problems may occur.
before this i use grbl laser for upload

[arkypita]

it is perfectly normal

[arkypita]

https://github.com/gnea/grbl/wiki/Frequently-Asked-Questions#compiling-grbl

[patrik156]

i still have roblem , can you help me
In file included from C:\Users\PC1\Documents\Arduino\libraries\grbl/grbl.h:43:0,

             from C:\Users\PC1\Documents\Arduino\libraries\grbl\examples\grblUpload\grblUpload.ino:27:

C:\Users\PC1\Documents\Arduino\libraries\grbl/nuts_bolts.h:56:0: warning: "max" redefined

#define max(a,b) (((a) > (b)) ? (a) : (b))

In file included from sketch\grblUpload.ino.cpp:1:0:

C:\Users\PC1\Desktop\arduino-1.8.11-windows\arduino-1.8.11\hardware\arduino\avr\cores\arduino/Arduino.h:93:0: note: this is the location of the previous definition

#define max(a,b) ((a)>(b)?(a):(b))

In file included from C:\Users\PC1\Documents\Arduino\libraries\grbl/grbl.h:43:0,

             from C:\Users\PC1\Documents\Arduino\libraries\grbl\examples\grblUpload\grblUpload.ino:27:

C:\Users\PC1\Documents\Arduino\libraries\grbl/nuts_bolts.h:57:0: warning: "min" redefined

#define min(a,b) (((a) < (b)) ? (a) : (b))

In file included from sketch\grblUpload.ino.cpp:1:0:

C:\Users\PC1\Desktop\arduino-1.8.11-windows\arduino-1.8.11\hardware\arduino\avr\cores\arduino/Arduino.h:92:0: note: this is the location of the previous definition

#define min(a,b) ((a)<(b)?(a):(b))

In file included from C:\Users\PC1\Documents\Arduino\libraries\grbl/grbl.h:43:0,

             from C:\Users\PC1\Documents\Arduino\libraries\grbl\examples\grblUpload\grblUpload.ino:27:

C:\Users\PC1\Documents\Arduino\libraries\grbl/nuts_bolts.h:61:0: warning: "bit" redefined

#define bit(n) (1 << n)

In file included from sketch\grblUpload.ino.cpp:1:0:

C:\Users\PC1\Desktop\arduino-1.8.11-windows\arduino-1.8.11\hardware\arduino\avr\cores\arduino/Arduino.h:124:0: note: this is the location of the previous definition

#define bit(b) (1UL << (b))

Sketch uses 29762 bytes (96%) of program storage space. Maximum is 30720 bytes.
Global variables use 1633 bytes (79%) of dynamic memory, leaving 415 bytes for local variables. Maximum is 2048 bytes.
Low memory available, stability problems may occur.

[arkypita]

These question should be done on the github page of grbl project, not here (LaserGRBL project).
First, however, do a search on old closed issue in grbl.... it has already been requested!

https://github.com/gnea/grbl/issues?utf8=✓&q=warning+redefined

[patrik156]

yes i find it , but now have another problem , i uncomment INVERT_SPINDLE_ENABLE_PIN , but it doesnt help

[StuartB4]

Or if you want a software solution you should re-compile and flash grbl to your arduino control board. There is a macro in grbl config.h called INVERT_SPINDLE_ENABLE_PIN that (if uncommented) allow to invert logic inside the control board.

Just had to do that myself. Bought a new 5 watt laser from wish.com but it has the TTL signal reversed on the built in driver board. So when it's powered and the PWM signal from the Arduino is 0 the laser comes on and stays on. I enabled the INVERT_SPINDLE_ENABLE_PIN in config.h and compiled and re-uploaded grbl to the Arduino and it works perfectly.

[StuartB4]

Patrik, did you compile and upload grbl to the arduino after making the invert spindle change?

[patrik156]

yes , but still have max power with M3 S0

[patrik156]

and this configuration is ok ?

[patrik156]

i try to connect NPN transistor , but i am not sure if it is correct . please can you check it please ?

[StuartB4]

The PWM signal should come out between Pin 3 on transistor and the end of the resistor and goto the PWM wire on the laser.
The other end of the resistor should have a voltage going in, 5 volts is enough.

[patrik156]

thank you ,now it works ,but i have one more question because i think that my laser is weak . so i set M3 S1000 and input to my laser is 5,5V . it is maximum ?

[StuartB4]

If you set $30 to 1000 in grbl settings then that will be the maximum laser power. Any number in between that and the minimum setting on $31 (should be set to 0) will be lower power. So if you set $31 to 1000 in grbl and then set the laser power to 500 in Lasergrbl settings when you prepare an image, then it will be 1/2 power, 250 will be 1/4 power and so on.