![]() I have read hundreds of posts on the subject to no avail and this is getting me crazy. Is there something in the GRBL config.h which could cause this issue ?.Are my configuration values incorrect regarding the laser functions (see below) ?.Is the "M3 S100" the right way to fire the laser constantly at a 100/255 percentage of the max power of the laser ?.The moving parts functions well (axis, endstops are OK). This is not a material issue as I have checked the pin 11 (Z-=) with an oscilloscope and a very simple sketch and it functions perfect as shown in the picture attached. Goal : I need to have a constant low power firing of the laser to be able to focus it properly. ![]() Whatever value I send, the signal desperately stays flat zero volt (well OK a few mV but not the PWM signal I am looking for) Issue : I can't seem to generate the PWM signal by using M3 commands using laserGRBL using "M3 S100" command. So far I have flashed the GRBL hex file grbl-081-arduino-mega2560-16u2-38400.hex And I am connecting to the mega 2560 with universal-gcode-sender v1.0.7. Ive connected the wires this way according to the diagram. I have finalized a first version of my engraver but can't seem to make the last step : firing the laser at will. Im working with this pin layout diagram for GRBL from. First of all, I am not sure if this is the best place to post this question, apologies if it's in the wrong place.
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