In our terminal, we can set up the current power level with the command “fire 10” for example. These are maximum_power, laser_module_minimum_power and laser_module_default_power. In config.txt there are a few parameters that should be adjusted to your laser. When everything is connected the next thing we wanna do is set up the power levels for our laser. Use the middleman board (google it) instead. If you have the flat cable DONT try to solder on the pins. The motors can be plugged into the skr board without any modifcations. Also I don’t have my flat band cable anymore so I just use a regular stepper motor connecting cable. If you want to use your endstops make sure to connect them on a free pin and assign them in the config according to the pinout provided. I don’t use endstops on my K40 because I broke the flat cable connecting them. I used Pin 3.25 as PWM pin and 2.0 as laser enable pin. (Right-click -> view image to enlarge the picture) (I used images from Sparkfun and Duet3D forum user hector, so credits go out to them.) The following diagram shows how I connected everything. 3.3V turned out to be fine for the PWM Signal, so I did not level convert that signal.) The microcontroller of the SKR1.3 only outputs 3.3V on the GPIO’s thats why we need a logic level shifter module like the one from Sparkfun.
The laser PWM pin can only be attached to PWM capable pins. (The laser enable pin can be attached to any free GPIO. 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 laser pwm input. Rename it to firmware.bin and upload that on your SKR board with either the USB cable or the SD-Card.
The first thing you need to do is to get the latest version of smoothieware here. Its been a while ago so this documentation may not be perfect. I successfully set up an SKR 1.3 board to operate my K40 with Smoothieware running on it.
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