Smoothieboard Wiring Diagrams

[David O' Brien]

I'm working on building my first laser cutter and have decided to use smoothieboard but cannot get the laser to fire besides by a physical active low switch. For anyone that's converted or built a machine, could you post a wiring diagram? I'm using a TH TL WP G IN 5V power supply.

Here's what I'm running from smoothie, to a shift converter, and then to the PSU:

P3.25 (PWM) to IN

Ground to G

3.3V to 5V 

On the power supply, there is a test switch between TL & G and a jumper from WP to G. I'm building this laser cutter for my business so any help would be very appreciated!

[Dimitri Modderman]

I have an SDZ laser.com powersupply that has exactly the same pin out.

In the manual it says to fire it , you need to tie WP (Waterprotect) TL and ground together since these are active low.

Applying 5 volt to IN, makes it fire full power, applying 2.5 makes it fire around 50% (it's not that linear but you get the idea!)

I am not sure how to do this with smoothie, but could be that you are overlooking that ?

Can be that you just need to tie these to ground and then use what you have now to get it to work.

The links to my powersupply that seems like it has the same connections as yours can be found here:

http://sdzlaser.com/download-information.html

The middle one is the powersupply, hope this helps !

Kind regards,

Dimitri

[David O' Brien]

That's basically what I have going for me at the moment - I can add a pot on there to adjust the voltage manually but I'd prefer to do it through smoothie using PWM. I know one of the conditions for PWM control to work is that TL must be enabled, but I don't know how to enable it. When I try to, it basically acts as a test switch and just fires the the laser continuously throughout the job.

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[ajf]

See here for some discussion on this and links to wiring diagrams.

On Wednesday, February 3, 2016 at 2:00:00 AM UTC-8, daveedius wrote:

That's basically what I have going for me at the moment - I can add a pot on there to adjust the voltage manually but I'd prefer to do it through smoothie using PWM. I know one of the conditions for PWM control to work is that TL must be enabled, but I don't know how to enable it. When I try to, it basically acts as a test switch and just fires the the laser continuously throughout the job.

On Wed, Feb 3, 2016 at 4:47 AM, Dimitri Modderman <dimitri.modde> wrote:

I have an SDZ laser.com powersupply that has exactly the same pin out.

In the manual it says to fire it , you need to tie WP (Waterprotect) TL and ground together since these are active low.

Applying 5 volt to IN, makes it fire full power, applying 2.5 makes it fire around 50% (it's not that linear but you get the idea!)

I am not sure how to do this with smoothie, but could be that you are overlooking that ?

Can be that you just need to tie these to ground and then use what you have now to get it to work.

The links to my powersupply that seems like it has the same connections as yours can be found here:

http://sdzlaser.com/download-information.html

The middle one is the powersupply, hope this helps !

Kind regards,

Dimitri

On Wednesday, February 3, 2016 at 10:18:22 AM UTC+1, David O' Brien wrote:

I'm working on building my first laser cutter and have decided to use smoothieboard but cannot get the laser to fire besides by a physical active low switch. For anyone that's converted or built a machine, could you post a wiring diagram? I'm using a TH TL WP G IN 5V power supply.

Here's what I'm running from smoothie, to a shift converter, and then to the PSU:

P3.25 (PWM) to IN

Ground to G

3.3V to 5V 

On the power supply, there is a test switch between TL & G and a jumper from WP to G. I'm building this laser cutter for my business so any help would be very appreciated!

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[daveedius]

Thanks for that - is it correct to run the PWM into the L pin? I thought it was supposed to go into "IN'? I do have a switch module set up which when activated creates an active low for the L pin using commands M3 & M5. Unfortunately, all this does is fire the laser 

[ajf]

Yeah PWM should go to IN. 

[daveedius]

I see your correction on PWM to IN instead of L. This is what I have set up, but the switch module just seems to act in the same manner as the test switch in that diagram? PWM doesn't seem to control  power, or when the laser is on or off. M3 turns the laser on to full power and it only turns off when I send the M5 command.

[ajf]

Do you have the same PSU as shown in the guide? Could you attach a pic of your and the wiring?

Also, how are you generating gcode? Please attach your test file.

[daveedius]

No it's not the exact same as that one but I believe it takes the same conditions to fire. It has inputs of TP, TL, WP, G, IN, 5V. 

WP is jumped to ground, I have TL going to low via a switch module as well as a test button. Here's the "manual" for my laser supply: http://protomx.com/wp-content/uploads/2015/01/40W-CO2-laser-power-supply.pdf

Give me a couple minutes and I'll get a photo of my wiring.

[daveedius]

From left to right:

H: No input

L: Test switch and active low input coming from level converter

WP: Jumper to G

G: Ground from shift converter, jumper from WP, test switch ground

IN: P3.25 to level converter to PSU

5V: Powers level converter.

Here's a photo of the inputs into the level converter:

From left to right:

Orange: P3.25 from smoothie

Brown: Ground to smoothie

Blue: 3.3V from smoothie

Green: Active low switch module from smoothie for activating L.

[ajf]

That looks right to me.

Could you attach your smoothie config file and the gcode you are running? Perhaps there's a clue there...

[daveedius]

For gcode, I've just been sending it commands through pronterface with variations of things like g1 x200 f300 S0.5

Here's the config:

# NOTE Lines must not exceed 132 characters

# Robot module configurations : general handling of movement G-codes and slicing into moves

default_feed_rate                            4000             # Default rate ( mm/minute ) for G1/G2/G3 moves

default_seek_rate                            4000             # Default rate ( mm/minute ) for G0 moves

mm_per_arc_segment                           0.5              # Arcs are cut into segments ( lines ), this is the length for

                                                              # these segments.  Smaller values mean more resolution,

                                                              # higher values mean faster computation

#mm_per_line_segment                          5                # Lines can be cut into segments ( not usefull with cartesian

                                                              # coordinates robots ).

# Arm solution configuration : Cartesian robot. Translates mm positions into stepper positions

alpha_steps_per_mm                           157.575               # Steps per mm for alpha stepper

beta_steps_per_mm                            157.575               # Steps per mm for beta stepper

gamma_steps_per_mm                           1600             # Steps per mm for gamma stepper

# Planner module configuration : Look-ahead and acceleration configuration

planner_queue_size                           32               # DO NOT CHANGE THIS UNLESS YOU KNOW EXACTLY WHAT YOU ARE DOING

acceleration                                 3000             # Acceleration in mm/second/second.

#z_acceleration                              500              # Acceleration for Z only moves in mm/s^2, 0 uses acceleration which is the default. DO NOT SET ON A DELTA

acceleration_ticks_per_second                1000             # Number of times per second the speed is updated

junction_deviation                           0.05             # Similar to the old "max_jerk", in millimeters,

                                                              # see https://github.com/grbl/grbl/blob/master/planner.c

                                                              # and https://github.com/grbl/grbl/wiki/Configuring-Grbl-v0.8

                                                              # Lower values mean being more careful, higher values means being

                                                              # faster and have more jerk

#z_junction_deviation                        0.0              # for Z only moves, -1 uses junction_deviation, zero disables junction_deviation on z moves DO NOT SET ON A DELTA

#minimum_planner_speed                       0.0              # sets the minimum planner speed in mm/sec

# Stepper module configuration

microseconds_per_step_pulse                  1                # Duration of step pulses to stepper drivers, in microseconds

base_stepping_frequency                      100000           # Base frequency for stepping

# Cartesian axis speed limits

x_axis_max_speed                             30000            # mm/min

y_axis_max_speed                             30000            # mm/min

z_axis_max_speed                             300              # mm/min

# Stepper module pins ( ports, and pin numbers, appending "!" to the number will invert a pin )

alpha_step_pin                               2.0              # Pin for alpha stepper step signal

alpha_dir_pin                                0.5!              # Pin for alpha stepper direction

alpha_en_pin                                 0.4              # Pin for alpha enable pin

alpha_current                                0.4              # X stepper motor current

alpha_max_rate                               30000.0          # mm/min

beta_step_pin                                2.1              # Pin for beta stepper step signal

beta_dir_pin                                 0.11             # Pin for beta stepper direction

beta_en_pin                                  0.10             # Pin for beta enable

beta_current                                 0.6              # Y stepper motor current

beta_max_rate                                30000.0          # mm/min

gamma_step_pin                               2.2              # Pin for gamma stepper step signal

gamma_dir_pin                                0.20             # Pin for gamma stepper direction

gamma_en_pin                                 0.19             # Pin for gamma enable

gamma_current                                1.5              # Z stepper motor current

gamma_max_rate                               300.0            # mm/min

# Serial communications configuration ( baud rate default to 9600 if undefined )

uart0.baud_rate                              115200           # Baud rate for the default hardware serial port

second_usb_serial_enable                     false            # This enables a second usb serial port (to have both pronterface

                                                              # and a terminal connected)

#leds_disable                                true             # disable using leds after config loaded

#play_led_disable                            true             # disable the play led

# kill button (used to be called pause) maybe assigned to a different pin, set to the onboard pin by default

kill_button_enable                           true             # set to true to enable a kill button

kill_button_pin                              2.12             # kill button pin. default is same as pause button 2.12 (2.11 is another good choice)

#msd_disable                                 false            # disable the MSD (USB SDCARD) when set to true (needs special binary)

#dfu_enable                                  false            # for linux developers, set to true to enable DFU

#watchdog_timeout                            10               # watchdog timeout in seconds, default is 10, set to 0 to disable the watchdog

# Extruder module configuration

extruder.hotend.enable                          true             # Whether to activate the extruder module at all. All configuration is ignored if false

extruder.hotend.steps_per_mm                    140              # Steps per mm for extruder stepper

extruder.hotend.default_feed_rate               600              # Default rate ( mm/minute ) for moves where only the extruder moves

extruder.hotend.acceleration                    500              # Acceleration for the stepper motor mm/sec²

extruder.hotend.max_speed                       50               # mm/s

extruder.hotend.step_pin                        2.3              # Pin for extruder step signal

extruder.hotend.dir_pin                         0.22             # Pin for extruder dir signal

extruder.hotend.en_pin                          0.21             # Pin for extruder enable signal

# extruder offset

#extruder.hotend.x_offset                        0                # x offset from origin in mm

#extruder.hotend.y_offset                        0                # y offset from origin in mm

#extruder.hotend.z_offset                        0                # z offset from origin in mm

# firmware retract settings when using G10/G11, these are the defaults if not defined, must be defined for each extruder if not using the defaults

#extruder.hotend.retract_length                  3               # retract length in mm

#extruder.hotend.retract_feedrate                45              # retract feedrate in mm/sec

#extruder.hotend.retract_recover_length          0               # additional length for recover

#extruder.hotend.retract_recover_feedrate        8               # recover feedrate in mm/sec (should be less than retract feedrate)

#extruder.hotend.retract_zlift_length            0               # zlift on retract in mm, 0 disables

#extruder.hotend.retract_zlift_feedrate          6000            # zlift feedrate in mm/min (Note mm/min NOT mm/sec)

delta_current                                1.5              # First extruder stepper motor current

# Second extruder module configuration

#extruder.hotend2.enable                          true             # Whether to activate the extruder module at all. All configuration is ignored if false

#extruder.hotend2.steps_per_mm                    140              # Steps per mm for extruder stepper

#extruder.hotend2.default_feed_rate               600              # Default rate ( mm/minute ) for moves where only the extruder moves

#extruder.hotend2.acceleration                    500              # Acceleration for the stepper motor, as of 0.6, arbitrary ratio

#extruder.hotend2.max_speed                       50               # mm/s

#extruder.hotend2.step_pin                        2.8              # Pin for extruder step signal

#extruder.hotend2.dir_pin                         2.13             # Pin for extruder dir signal

#extruder.hotend2.en_pin                          4.29             # Pin for extruder enable signal

#extruder.hotend2.x_offset                        0                # x offset from origin in mm

#extruder.hotend2.y_offset                        25.0             # y offset from origin in mm

#extruder.hotend2.z_offset                        0                # z offset from origin in mm

#epsilon_current                              1.5              # Second extruder stepper motor current

# Laser module configuration

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

                                                              # ignored if false.

#laser_module_pin                             3.25             # 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                   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                   0.8             # 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 0.26!^ # 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

# Hotend temperature control configuration

temperature_control.hotend.enable            true             # Whether to activate this ( "hotend" ) module at all.

                                                              # All configuration is ignored if false.

temperature_control.hotend.thermistor_pin    0.23             # Pin for the thermistor to read

temperature_control.hotend.heater_pin        2.7              # Pin that controls the heater, set to nc if a readonly thermistor is being defined

temperature_control.hotend.thermistor        EPCOS100K        # see http://smoothieware.org/temperaturecontrol#toc5

#temperature_control.hotend.beta             4066             # or set the beta value

temperature_control.hotend.set_m_code        104              #

temperature_control.hotend.set_and_wait_m_code 109            #

temperature_control.hotend.designator        T                #

#temperature_control.hotend.max_temp         300              # Set maximum temperature - Will prevent heating above 300 by default

#temperature_control.hotend.min_temp         0                # Set minimum temperature - Will prevent heating below if set

#temperature_control.hotend.p_factor         13.7             # permanently set the PID values after an auto pid

#temperature_control.hotend.i_factor         0.097            #

#temperature_control.hotend.d_factor         24               #

#temperature_control.hotend.max_pwm          64               # max pwm, 64 is a good value if driving a 12v resistor with 24v.

# Hotend2 temperature control configuration

#temperature_control.hotend2.enable            true             # Whether to activate this ( "hotend" ) module at all.

                                                              # All configuration is ignored if false.

#temperature_control.hotend2.thermistor_pin    0.25             # Pin for the thermistor to read

#temperature_control.hotend2.heater_pin        1.23             # Pin that controls the heater

#temperature_control.hotend2.thermistor        EPCOS100K        # see http://smoothieware.org/temperaturecontrol#toc5

##temperature_control.hotend2.beta             4066             # or set the beta value

#temperature_control.hotend2.set_m_code        104              #

#temperature_control.hotend2.set_and_wait_m_code 109            #

#temperature_control.hotend2.designator        T1               #

#temperature_control.hotend2.p_factor          13.7           # permanently set the PID values after an auto pid

#temperature_control.hotend2.i_factor          0.097          #

#temperature_control.hotend2.d_factor          24             #

#temperature_control.hotend2.max_pwm          64               # max pwm, 64 is a good value if driving a 12v resistor with 24v.

temperature_control.bed.enable               true             #

temperature_control.bed.thermistor_pin       0.24             #

temperature_control.bed.heater_pin           2.5              #

temperature_control.bed.thermistor           Honeywell100K    # see http://smoothieware.org/temperaturecontrol#toc5

#temperature_control.bed.beta                3974             # or set the beta value

temperature_control.bed.set_m_code           140              #

temperature_control.bed.set_and_wait_m_code  190              #

temperature_control.bed.designator           B                #

#temperature_control.bed.bang_bang            false           # set to true to use bang bang control rather than PID

#temperature_control.bed.hysteresis           2.0             # set to the temperature in degrees C to use as hysteresis

                                                              # when using bang bang

# Switch module for fan control

switch.fan.enable                            true             #

switch.fan.input_on_command                  M106             #

switch.fan.input_off_command                 M107             #

switch.fan.output_pin                        2.6              #

switch.fan.output_type                       pwm              # pwm output settable with S parameter in the input_on_comand

#switch.fan.max_pwm                           255              # set max pwm for the pin default is 255

#switch.misc.enable                           true             #

#switch.misc.input_on_command                 M42              #

#switch.misc.input_off_command                M43              #

#switch.misc.output_pin                       2.4              #

#switch.misc.output_type                      digital          # just an on or off pin

# automatically toggle a switch at a specified temperature. Different ones of these may be defined to monitor different temperatures and switch different swithxes

# useful to turn on a fan or water pump to cool the hotend

#temperatureswitch.hotend.enable              true             #

#temperatureswitch.hotend.designator          T                # first character of the temperature control designator to use as the temperature sensor to monitor

#temperatureswitch.hotend.switch              misc             # select which switch to use, matches the name of the defined switch

#temperatureswitch.hotend.threshold_temp      60.0             # temperature to turn on (if rising) or off the switch

#temperatureswitch.hotend.heatup_poll         15               # poll heatup at 15 sec intervals

#temperatureswitch.hotend.cooldown_poll       60               # poll cooldown at 60 sec intervals

# Switch module for spindle control

#switch.spindle.enable                        false            #

# Endstops

endstops_enable                              true             # the endstop module is enabled by default and can be disabled here

#corexy_homing                               false            # set to true if homing on a hbot or corexy

alpha_min_endstop                            1.24^            # add a ! to invert if endstop is NO connected to ground

alpha_max_endstop                            1.25^            # NOTE set to nc if this is not installed

alpha_homing_direction                       home_to_min      # or set to home_to_max and set alpha_max

alpha_min                                    0                # this gets loaded after homing when home_to_min is set

alpha_max                                    200              # this gets loaded after homing when home_to_max is set

beta_min_endstop                             1.26^            #

beta_max_endstop                             1.27^            #

beta_homing_direction                        home_to_min      #

beta_min                                     0                #

beta_max                                     200              #

gamma_min_endstop                            1.28^            #

gamma_max_endstop                            1.29^            #

gamma_homing_direction                       home_to_min      #

gamma_min                                    0                #

gamma_max                                    200              #

# optional order in which axis will home, default is they all home at the same time,

# if this is set it will force each axis to home one at a time in the specified order

#homing_order                                 XYZ              # x axis followed by y then z last

#move_to_origin_after_home                    false            # move XY to 0,0 after homing

# optional enable limit switches, actions will stop if any enabled limit switch is triggered

#alpha_limit_enable                          false            # set to true to enable X min and max limit switches

#beta_limit_enable                           false            # set to true to enable Y min and max limit switches

#gamma_limit_enable                          false            # set to true to enable Z min and max limit switches

alpha_fast_homing_rate_mm_s                  50               # feedrates in mm/second

beta_fast_homing_rate_mm_s                   50               # "

gamma_fast_homing_rate_mm_s                  4                # "

alpha_slow_homing_rate_mm_s                  25               # "

beta_slow_homing_rate_mm_s                   25               # "

gamma_slow_homing_rate_mm_s                  2                # "

alpha_homing_retract_mm                      5                # distance in mm

beta_homing_retract_mm                       5                # "

gamma_homing_retract_mm                      1                # "

#endstop_debounce_count                       100              # uncomment if you get noise on your endstops, default is 100

# optional Z probe

zprobe.enable                                false           # set to true to enable a zprobe

zprobe.probe_pin                             1.28!^          # pin probe is attached to if NC remove the !

zprobe.slow_feedrate                         5               # mm/sec probe feed rate

#zprobe.debounce_count                       100             # set if noisy

zprobe.fast_feedrate                         100             # move feedrate mm/sec

zprobe.probe_height                          5               # how much above bed to start probe

#gamma_min_endstop                           nc              # normally 1.28. Change to nc to prevent conflict,

# associated with zprobe the leveling strategy to use

#leveling-strategy.three-point-leveling.enable         true        # a leveling strategy that probes three points to define a plane and keeps the Z parallel to that plane

#leveling-strategy.three-point-leveling.point1         100.0,0.0   # the first probe point (x,y) optional may be defined with M557

#leveling-strategy.three-point-leveling.point2         200.0,200.0 # the second probe point (x,y)

#leveling-strategy.three-point-leveling.point3         0.0,200.0   # the third probe point (x,y)

#leveling-strategy.three-point-leveling.home_first     true        # home the XY axis before probing

#leveling-strategy.three-point-leveling.tolerance      0.03        # the probe tolerance in mm, anything less that this will be ignored, default is 0.03mm

#leveling-strategy.three-point-leveling.probe_offsets  0,0,0       # the probe offsets from nozzle, must be x,y,z, default is no offset

#leveling-strategy.three-point-leveling.save_plane     false       # set to true to allow the bed plane to be saved with M500 default is false

# Panel

panel.enable                                 false             # set to true to enable the panel code

panel.lcd                                    smoothiepanel     # set type of panel

panel.encoder_a_pin                          3.25!^            # encoder pin

panel.encoder_b_pin                          3.26!^            # encoder pin

# Example for reprap discount GLCD

# on glcd EXP1 is to left and EXP2 is to right, pin 1 is bottom left, pin 2 is top left etc.

# +5v is EXP1 pin 10, Gnd is EXP1 pin 9

#panel.lcd                                   reprap_discount_glcd     #

#panel.spi_channel                           0                 # spi channel to use  ; GLCD EXP1 Pins 3,5 (MOSI, SCLK)

#panel.spi_cs_pin                            0.16              # spi chip select     ; GLCD EXP1 Pin 4

#panel.encoder_a_pin                         3.25!^            # encoder pin         ; GLCD EXP2 Pin 3

#panel.encoder_b_pin                         3.26!^            # encoder pin         ; GLCD EXP2 Pin 5

#panel.click_button_pin                      1.30!^            # click button        ; GLCD EXP1 Pin 2

#panel.buzz_pin                              1.31              # pin for buzzer      ; GLCD EXP1 Pin 1

#panel.back_button_pin                       2.11!^            # back button         ; GLCD EXP2 Pin 8

# pins used with other panels

#panel.up_button_pin                         0.1!              # up button if used

#panel.down_button_pin                       0.0!              # down button if used

#panel.click_button_pin                      0.18!             # click button if used

panel.menu_offset                            0                 # some panels will need 1 here

panel.alpha_jog_feedrate                     6000              # x jogging feedrate in mm/min

panel.beta_jog_feedrate                      6000              # y jogging feedrate in mm/min

panel.gamma_jog_feedrate                     200               # z jogging feedrate in mm/min

panel.hotend_temperature                     185               # temp to set hotend when preheat is selected

panel.bed_temperature                        60                # temp to set bed when preheat is selected

# Example of a custom menu entry, which will show up in the Custom entry.

# NOTE _ gets converted to space in the menu and commands, | is used to separate multiple commands

custom_menu.power_on.enable                true              #

custom_menu.power_on.name                  Power_on          #

custom_menu.power_on.command               M80               #

custom_menu.power_off.enable               true              #

custom_menu.power_off.name                 Power_off         #

custom_menu.power_off.command              M81               #

# Only needed on a smoothieboard

currentcontrol_module_enable                 true             #

return_error_on_unhandled_gcode              false            #

# network settings

network.enable                               false            # enable the ethernet network services

network.webserver.enable                     true             # enable the webserver

network.telnet.enable                        true             # enable the telnet server

network.ip_address                           auto             # use dhcp to get ip address

# uncomment the 3 below to manually setup ip address

#network.ip_address                           192.168.3.222    # the IP address

#network.ip_mask                              255.255.255.0    # the ip mask

#network.ip_gateway                           192.168.3.1      # the gateway address

#network.mac_override                         xx.xx.xx.xx.xx.xx  # override the mac address, only do this if you have a conflict 

[ajf]

It might be Pronterface, especially if you have the SD card mounted on your computer too. I've never actually tried Pronterface with the laser, always use LCD, but I know there can be issues on 3D printers when the SD card is mounted (especially on Mac.)

Could you try the attached gcode? I'd say, if you don't have a LCD, write it to the SD card from Pronterface and run it from there... It's a small part with straight lines and a couple of circles, have feed set to F300 and intensity at 30%

[daveedius]

Tried the file - it connected all the lines. i.e. laser on all the time

[ajf]

The next step is confirm the fire output from the level shifter is correct. Disconnect it from the PSU, put a multimeter on it and see it switch from low to high as you run the code.

Did the PWM to IN work? Or were you firing a 100% instead of 30%?

[daveedius]

Fire output works correctly but I think there may be something going on with the PWM, it did fire at 100%.  I really appreciate the help on this - but had to put smoothie on hold and purchase a DSP system for the moment because I use the machine for my business. I do plan on giving this another shot in the future because open source is very enticing.

[ajf]

Perhaps the level shifter channel is bad?

[Athul]

 I don't know if this problem is solved.

In the configuration he hasnenabled the laser module but commented out the pins and other configurations, see

# Laser module configuration

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

                                                              # ignored if false.

#laser_module_pin                             3.25             # 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                   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                   0.8             # 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

remove the #

[Athul]

Remove # only in #laser_module_pin                             3.25 to laser_module_pin                             3.25 

Keep the remaining

[TealVince]

My power supply doesn't respond fast enough at the default PWM period.  I had the opposite problem in that it was at 100% for anything but level 0.  I slowed it down from 20 to 200 microseconds and it worked fine after that.  There's probably an intermediate value that would work, but I haven't revisited it since.

[daveedius]

No, never got it working because I ran out of time to work on  this project.

[Athul]

@daveedius

I had the same problem,.

laser  was always emitting with out any command,and when i checked it with the multi meter between my IN pin and GND I noticed a voltage of 2.14.

It was because I hadn't enabled the pin I assigned for PWM. Uncommenting # from  #laser_module_pin                             3.25 to laser_module_pin                             3.25 

solved the problem, also make sure you're not using this pin for any other problems.