How to use a LED Strip with Duet 2 WiFI?

dc42

@the_dragonlord said in How to use a LED Strip with Duet 2 WiFI?:

@dc42 for me at now is enough to be able to drive via gcode a mosfet wich drives a simple led stripe, it would be great to be able to set the brightness too... maybe it is possible moduling the pwm? In case how can I use a pin via gcode?

Yes you can use PWM. See https://duet3d.dozuki.com/Wiki/Using_servos_and_controlling_unused_IO_pins (note, this has not yet been updated to cover RepRapFirmware 3).

A Former User

@dc42 wow so i could use a servo pin to drive a mosfet in pwm like this and so be able to start and stop the lighting with the print and adjust the brightness as well!

dc42

@the_dragonlord said in How to use a LED Strip with Duet 2 WiFI?:

@dc42 wow so i could use a servo pin to drive a mosfet in pwm like this and so be able to start and stop the lighting with the print and adjust the brightness as well!

Yes.

A Former User

@dc42 excellent my friend, thank you soooooo much!

A Former User

@dc42 I'm trying to configure it, I used the commands:

M950 S0 C"exp.heater4" to map the heater4 pin for the servo indexed 0,

I've attached the GND and the exp.heater pins to a command port of a Mosfet but if I lunch the command

M280 P0 S100000

To try to give a 100000 micro second (a second) pulse just to try nothing happens and the Mosfet doesn't trigger....so I'm afraid that the Mosfet doesn't trigger with the high value given by the remapped heater4....I need a 12V PWM output to trigger the mosfet, I think I could use a PWM fan, could I? Honestly I've tried to read the documentation for how to comand a PWM fan via gcode but I didn't understand so much....I've found this example:

M950 F2 C"!Fan2+exp.pb6" Q25000 ; fan 2 is a 4-wire PWM fan so invert it, use high PWM frequency, tacho connected to PB6 on expansion connector

But I can't understand because looking at the wiring diagram FAN2 isn't a 4 pin
And I don't understand why I had to use an expansion pin too....so as you can see I'm a looooooooooooooot confusing and I'd better not to go with "trial & error" because I don't want to burn the board....the main question is: can I use the FAN2 2 pins to trigger the mosfet with 12vdc and start, modulate the PWM, and stop the FAN (led stripe) via gcode? In case how?
Thanks a lot!

Phaedrux

I think you're overthinking it. The fan ports use PWM by switching the negative side and don't require the 4 pin that a true 4 wire PWM fan does (though that is an option, it's not what you need for a simple LED strip).

Just connect your LED string to Fan2 and control it like a regular part cooling fan.

M950 F2 C"Fan2" Q500
M106 P2 S255

A Former User

@Phaedrux said in How to use a LED Strip with Duet 2 WiFI?:

I think you're overthinking it. The fan ports use PWM by switching the negative side and don't require the 4 pin that a true 4 wire PWM fan does (though that is an option, it's not what you need for a simple LED strip).

Just connect your LED string to Fan2 and control it like a regular part cooling fan.

M950 F2 C"Fan2" Q500
M106 P2 S255

thanks soooooo much

ericlmccormick

I have a 24v psu so I use a 24v led strip. I first used a fan output, however the voltage drop caused an issue with my other fans. I switch to using heater output 2 and it works flawlessly.

ericlmccormick

In config. g
;LED Strip
M950 P2 C"e1heat"
M307 P2 A-1 C-1 D-1

Then add the following to change power output
M42 P2 Sxxx

Phaedrux

@ericlmccormick said in How to use a LED Strip with Duet 2 WiFI?:

M307 P2 A-1 C-1 D-1

No longer used in RRF3.

Chriss

@Phaedrux

I have a question here too.

I use that code to configure my LED strip:

M950 F3 C"0.out6" Q500
M106 P3 S0

(And I have two macros to turn in on and off via the web or display than.)

So the "controller" is called "Fan 3" on the Display. Is there a way to rename the object? Like I can rename a tool? (563 S"BlaBla")

Cheers, Chriss

Phaedrux

@Chriss Yes, M106 C"LEDs" would give it the name LEDs.

https://duet3d.dozuki.com/Wiki/Gcode#Section_M106_Fan_On

Chriss

@Phaedrux

Thanks! Workes as expected. I expected that in the "M950" because that is the configuration of the object to me and "M106" the "on/off" only. So I did not looked into the docu of M106.
Anyway: Thank you very much for the fast answer.

Cheers, Chriss

A Former User

@ericlmccormick said in How to use a LED Strip with Duet 2 WiFI?:

In config. g
;LED Strip
M950 P2 C"e1heat"
M307 P2 A-1 C-1 D-1

Then add the following to change power output
M42 P2 Sxxx

Done! When I boot the board the pin is setted "high" and the LED stripe is immediately turned on with the maximum pulse width. How can I set to let the pin low when the board starts?

ericlmccormick

Make sure the M42 code is in the slicer startup code and NOT in config.g

I put M32 in my slicer start code which calls beg.g and M0 in my slicer end code which runs stop.g

Then I have M42 P2 S255 in my bed.g and M42 P2 S0 in stop.g and cancel.g

A Former User

@ericlmccormick said in How to use a LED Strip with Duet 2 WiFI?:

Make sure the M42 code is in the slicer startup code and NOT in config.g

I put M32 in my slicer start code which calls beg.g and M0 in my slicer end code which runs stop.g

Then I have M42 P2 S255 in my bed.g and M42 P2 S0 in stop.g and cancel.g

already done but the stripe turns on when I boot the board even without m42

ericlmccormick

@the_dragonlord can you share your config.g file?

A Former User

@ericlmccormick said in How to use a LED Strip with Duet 2 WiFI?:

@the_dragonlord can you share your config.g file?

here it is:

; Configuration file for Duet WiFi (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.1.4 on Mon Oct 26 2020 18:43:35 GMT+0100 (Ora standard dell’Europa centrale)

; General preferences
G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
M550 P"DragonCore" ; set printer name
M669 K1 ; select CoreXY mode

; Network
M552 S1 ; enable network
M586 P0 S1 ; enable HTTP
M586 P1 S1 ; enable FTP
M586 P2 S1 ; enable Telnet

; Drives
M569 P0 S0 ; physical drive 0 goes backwards
M569 P1 S0 ; physical drive 1 goes backwards
M569 P2 S0 ; physical drive 2 goes backwards
M569 P3 S0 ; physical drive 3 goes backwards
M584 X0 Y1 Z2 E3 ; set drive mapping
M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
M92 X160.00 Y160.00 Z1200.00 E420.00 ; set steps per mm
M566 X900.00 Y900.00 Z12.00 E120.00 ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z180.00 E1200.00 ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z20.00 E250.00 ; set accelerations (mm/s^2)
M906 X800 Y800 Z800 E800 I30 ; set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout

; Axis Limits
M208 X0 Y0 Z0 S1 ; set axis minima
M208 X330 Y330 Z400 S0 ; set axis maxima

; Endstops
M574 X1 S1 P"xstop" ; configure active-high endstop for low end on X via pin xstop
M574 Y1 S1 P"ystop" ; configure active-high endstop for low end on Y via pin ystop
M574 Z1 S2 ; configure Z-probe endstop for low end on Z

; Z-Probe
M950 S0 C"exp.heater3" ; create servo pin 0 for BLTouch
M558 P9 C"^zprobe.in" H5 F120 T6000 ; set Z probe type to bltouch and the dive height + speeds
G31 P500 X0 Y0 Z0.474 ; set Z probe trigger value, offset and trigger height
M557 X15:315 Y15:315 S20 ; define mesh grid

; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B4092 ; configure sensor 0 as thermistor on pin bedtemp
M950 H0 C"bedheat" T0 ; create bed heater output on bedheat and map it to sensor 0
M307 H0 B0 S1.00 ; disable bang-bang mode for the bed heater and set PWM limit
M140 H0 ; map heated bed to heater 0
M143 H0 S120 ; set temperature limit for heater 0 to 120C
M308 S1 P"e0temp" Y"thermistor" T100000 B4725 C7.06e-8 ; configure sensor 1 as thermistor on pin e0temp
M950 H1 C"e0heat" T1 ; create nozzle heater output on e0heat and map it to sensor 1
M307 H1 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit

; Fans
M950 F0 C"fan0" Q500 ; create fan 0 on pin fan0 and set its frequency
M106 P0 S0 H-1 ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"fan1" Q500 ; create fan 1 on pin fan1 and set its frequency
M106 P1 S1 H1 T50 ; set fan 1 value. Thermostatic control is turned on
M950 F2 C"fan2" Q500 ; create fan 2 on pin fan2 and set its frequency
M106 P2 S1 H-1 ; set fan 2 value. Thermostatic control is turned off

; Tools
M563 P0 S"E3DVolcano" D0 H1 F0 ; define tool 0
G10 P0 X0 Y0 Z0 ; set tool 0 axis offsets
G10 P0 R0 S0 ; set initial tool 0 active and standby temperatures to 0C

; Custom settings are not defined

; Miscellaneous
M575 P1 S1 B57600 ; enable support for PanelDue

M501

uh, I forgot to say that I'm using a PWM fan not an heater.....sorry....

Phaedrux

@the_dragonlord said in How to use a LED Strip with Duet 2 WiFI?:

uh, I forgot to say that I'm using a PWM fan not an heater.....sorry....

Which fan header and where is the gcode defining the pin?

ericlmccormick

@the_dragonlord your problem is you have m106 P2 S1 H-1 and you should have m106 P2 S0 H-1