Tool board pwm header

madmattco

I was looking at replacing my regular heat sink fan with a pwm model. I looked up the wiring from noctua and they list the pwm signal at 5v. The tool board wiring diagram lists the pwm as 12v. I assume I won't be able to use a 4 wire fan, but instead will have to use a regular 3 pin or just use 2 pins for power it?

dc42

The PWM signal is an open drain output as specified in the Intel specification. It works with Noctua fans and other brands.

madmattco

@dc42 Cheers

madmattco

@dc42 Can you not use 2 tacho signals at the same time?

; Fans
M950 F0 C"121.out2+out2.tach" Q500 ; create fan 0 on pin out3 and set its frequency
M106 P0 S0 H-1 ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"121.out1+out1.tach" Q500 ; create fan 1 on pin out4 and set its frequency
M106 P1 S1 H1 T50 ; set fan 1 value. Thermostatic control is turned on

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madmattco

I got it working after a reboot. But now I have another problem.

My hotend fan is running even though it is supposed to be under thermostatic control.

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; Configuration file for Duet 3 (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v2.1.8 on Sun Apr 05 2020 04:11:56 GMT-0400 (Eastern Daylight Time)

; General preferences
G90                                          ; send absolute coordinates...
M83                                          ; ...but relative extruder moves
M550 P"FT-6"                               ; set printer name

; Drives
M569 P0.0 S1                                 ; physical drive 0.0 goes forwards
M569 P0.1 S0                                 ; physical drive 0.1 goes forwards
M569 P0.2 S1                                 ; physical drive 0.2 goes forwards
M569 P121.0 S0                                 ; physical drive 0.3 goes forwards
M584 X0.0 Y0.1 Z0.2 E121.0                     ; set drive mapping
M350 X256 Y256 Z16 E16 I1                      ; configure microstepping with interpolation
M92 X1280.00 Y1280.00 Z720.00 E409.00           ; set steps per mm
M566 X900.00 Y900.00 Z6.00 E120.00          ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z150.00 E1200.00      ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z10.00 E250.00          ; set accelerations (mm/s^2)
M906 X1200 Y800 Z1500 E750 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 X690 Y330 Z400 S0                       ; set axis maxima

; Endstops
M574 X1 S1 P"!io0.in"                         ; configure active-low endstop for low end on X via pin io0.in
M574 Y1 S1 P"!io1.in"                         ; configure active-low endstop for low end on Y via pin io1.in
;M574 Z1 S1 P"^io2.in"                         ; configure active-low endstop for low end on Z via pin io2.in

; Z-Probe
M558 P8 C"121.io1.in" H5 F120 T6000               ; disable Z probe but set dive height, probe speed and travel speed
M557 X15:650 Y15:300 S100                     ; define mesh grid

; Heaters
M308 S0 P"temp0" Y"thermistor" T100000 B4138 ; configure sensor 0 as thermistor on pin temp0
M950 H0 C"out0" T0                           ; create bed heater output on out0 and map it to sensor 0
M143 H0 S120                                 ; set temperature limit for heater 0 to 120C
M307 H0 B1 S1.00                             ; enable bang-bang mode for the bed heater and set PWM limit
M140 H0                                      ; map heated bed to heater 0
M308 S1 P"121.temp0" Y"thermistor" T100000 B4138 ; configure sensor 1 as thermistor on pin temp1
M950 H1 C"121.out0" T1                           ; create nozzle heater output on out1 and map it to sensor 1
M143 H1 S280                                 ; set temperature limit for heater 1 to 280C
M307 H1 B0 S1.00                             ; disable bang-bang mode for heater  and set PWM limit

; Fans
M950 F0 C"121.out2+out2.tach" Q500                         ; create fan 0 on pin out3 and set its frequency
M106 P0 S0 H-1                               ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"121.out1+out1.tach" Q500                         ; create fan 1 on pin out4 and set its frequency
M106 P1 S1 H1 T50                            ; set fan 1 value. Thermostatic control is turned on

; Tools
M563 P0 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
G31 P500 X-23.5 Y-24.5 Z1.85                          ; Probe offsets

; Custom settings are not defined

; Miscellaneous
M501                                         ; load saved parameters from non-volatile memory

When the hotend reaches 50 degrees the fan actually turns off

dc42

Is it a 4 wire fan? If so then you need to invert the main pin in the M950 F command.