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bigtreetech / BIGTREETECH-SKR-V1.3

32bit board with LPC1768, support marlin2.0 and smoothieware, support lcd2004/12864, On-board TMC2130 SPI interface and TMC2208 UART interface no additional wiring is required
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Smoothieware Laser Engraver #321

Open jr-11 opened 4 years ago

jr-11 commented 4 years ago

I am trying to set up a laser engraver with the smoothieware firmware and config files provided on the skr v1.3 Github page. I have enabled the laser module and set the pins for enabling the laser along with the PWM pin, and when I run the laser I don't get any output on either pin. I'm not quite sure what the problem is. Help would be much appreciated.

derbengale commented 4 years ago

Im having the same problem here. This is what I added to the configuration file: 


## Laser module configuration
laser_module_enable                          true            # Whether to activate the laser module at all. All configuration is
                                                              # ignored if false.
laser_module_pin                             3.26             # this pin will be PWMed to control the laser. Only P2.0 - P2.5, P1.18, P1.20, P1.21, P1.23, P1.24, P1.26, P3.25, P3.26
                                                              # can be used since laser requires hardware PWM
laser_module_maximum_power                   .8             # this is the maximum duty cycle that will be applied to the laser
laser_module_minimum_power                   0.0             # This is a value just below the minimum duty cycle that keeps the laser
                                                              # active without actually burning.
laser_module_default_power                   0.3             # This is the default laser power that will be used for cuts if a power has not been specified.  The value is a scale between
                                                              # the maximum and minimum power levels specified above
laser_module_pwm_period                      20              # this sets the pwm frequency as the period in microseconds

switch.laserfire.enable                      true       #

switch.laserfire.output_pin                  2.0!^          # connect to laser PSU fire (!^ if to active low, !v if to active high)

switch.laserfire.output_type                 digital        #

switch.laserfire.input_on_command            M3         # fire laser

switch.laserfire.input_off_command           M5 # laser off

I tried to set switch.laserfire.output_pin to the pins 3.25 3.26 and 2.0 but neither worked for me. Couldn't test the pwm because I can't switch the laser on and off using M3 or M5 or fire 10/fire off

Update: I found that the Pins on the LPC1768 are 5V tolerant, but if you pull them up, you pull them up to 3.3V only. That is the reason why we can't switch the laser on and off directly. After some playing around I could get the M3 / M5 switching process working. I assume that this will work properly if we put a level converter in between the lines. Ill update this if I get this working.

Update2: Indeed, only a cheap level transistor module fixed it. My config.txt is attached. config.txt

So now it is possible to use Smoothieware with the SKR 1.3 on our K40's

dangerousderek commented 3 years ago

Hey Sorry to bother you, I am also trying to get my K40 running on a skr 1.3. I appreciate the share of the config file, but if you would be willing to share how you wired it up I would be grateful. I am not sure what you mean by cheap level transistor module, so any links and/or pics would be awesome! thanks!