Noctua fan controlled by firmware
-
I am trying to control a 40x10mm 5V 3pin noctua fan by firmware but I am having difficulties.
I am using a duet 2 wifi and a duex5. I have a 24V and a 5V power supply. IOn the duet 2 I have the jumpers at the EXT 5V EN and the V_FAN JUMPER at 5V.
I have attached the fan to the hot end heatsink, trying to make it quieter. I have connected the red-black cables to the always on fans on the duet 2 wifi board and the yellow wire (signal) to the PWM1 on the duex5 board, but it is spinning all the time. I want it to start when the heater is at 45 degrees.This is my code:
M950 H4 C"nil" ; disable heater 4 and free up the associated pin
M950 F2 C"!duex.pwm2" Q25000 ; create fan 2 (extruder 1 fan) on pin pwm2 and set its frequency
M106 P2 S1 H1 T45 ; set fan 0.7 value. Thermostatic control is turned on -
@sigourosandreas said in Noctua fan controlled by firmware:
I have connected the red-black cables to the always on fans on the duet 2 wifi board and the yellow wire (signal) to the PWM1 on the duex5 board, but it is spinning all the time.
if it's a 3 wire noctua fan it's likely that the 3rd wire is actually just a tachometer readout and not PWM. That would usually be the 4th wire.
Do you have the exact noctua model number?
It would likely be easier to just connect the 2 wires to an available fan output and then letting the Duet do "fake" hardware PWM to control the fan.
You could still use the 3rd wire for an RPM readout if you wished.
https://duet3d.dozuki.com/Wiki/Connecting_and_configuring_fans
-
https://noctua.at/en/what-pin-configuration-do-noctua-products-use
Yellow is always tachometer. Not the PWM signal
-
@pcr You are correct. Thanks.
-
@phaedrux I checked the noctua manual and are right.
I use only the 2 wires. Thanks
