My Laser produce strange pattern. PWM Problems?

[MichaelG (Michael)]

So I made further tests, here with pwm 300

here with pwm 20:

1. Yes, the SKR has 3.3 logic, The 5V is powering the HV-side of the level shifter.
   In general I made it like this…

How to set up the SKR 1.3/1.4 Board with the K40 Laser

Hello everybody, I successfully set up an SKR 1.3 board to operate my K40 with Smoothieware running on it. Its been a while ago so this documentation may not be perfect. The first thing you need to do is to get the latest version of smoothieware here. Rename it to firmware.bin and upload that on your SKR board with either the USB cable or the SD-Card. To control the laser with the SKR board we need to connect two inputs of the laser PSU to free pins on the SKR board: the laser enable and the…

2. Yes, these are the Pins on the SKR.

3. I tried both. An external one with shared Ground and the current version with 24V out of the LPS

4. I think so. With higher % in Lightburn the engraving is deeper/darker.