I’m making a core xy laser engraver using an AENBUSLM DLC-40 which has 3pins for +12V, GND, and 5Volt PWM. For the control board I am using the BTT SKR1.4 which has 5 volt pwm pin available at the Neopixel connector:
J7 can be directly connected to the laser if the jumps at J9 is placed on Pin 2 and 3 to use VOT for NPWR and also add jumper wires from the VBB PINS 2 /4 to VOT pins 2/4
The problem I am running into is that I cannot get Marlin 2.1.x to produce a pwm output using pin 1_24. I have commented out the neopixel define in the board file for the skr1.4 and followed the various guides to edit configuration.h and configuration_adv.h for spindle/laser using M3, M4 and M5. The laser does turn on from both light burn and the display pulse laser button but only at extremely low power no matter what the pwm power setting is.
Can anyone help?