I know this may peev a few people off as this has been talked

Lasers
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1

I know this may peev a few people off as this has been talked about over and over but can someone please walk me through where to wire for dual pin config? I understand that the PWM goes to IN on the PSU and then the second ttl switch goes to L but which pin do I connect L to on the smoothieboard? I want to get rid of the pot control and just have the smoothie control everything.

2

Am I right in saying that all i need to do is solder a header to, say, pin P2.7 (currently have a header soldered into P2.5 for PWM) and then add the following to my config:

Switch module for laser TTL control

http://switch.laser.enable true
switch.laser.input_on_command M3
switch.laser.input_off_command M5
switch.laser.output_pin 2.7

3

I can’t say precisely for dual pin config. On mine I just soldered a bunch of headers to the pins 2.6,2.5,2.4,etc (the bunch of 5 there). I am using single pin & pin 2.4! (inverted).

4

The latest firmware supports a ttl pin configuration. Here’s an extract from my config file…

Laser module configuration

laser_module_enable true # Whether to activate the laser module at all. All configuration is

                                                          # ignored if false.

laser_module_pwm_pin 2.2 # 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_ttl_pin 0.26^
laser_module_maximum_power 0.8 # 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 0.5 # 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

5

Had a play last night and I now have PWM into IN (not inverted), no pot and original laser activation switch that enables the laser. Think I will run with this setup for a while and see what happens.

6

@Steve_Wilks I have this now but what are you wiring pin 0.26 to on the psu?

7

Sorry for the late reply…I’m pretty sure my PSU is different as I have the K40 with the digital power panel. I’ll confirm my wiring when I get home.